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linux/drivers/gpu/drm/i915/intel_dpll_mgr.c
Ville Syrjälä 8aae2b1cdf drm/i915: Pick the first unused PLL once again 
commit 5b0bd14dcc ("drm/i915/icl: keep track of unused pll while
looping") inadvertently (I presume) changed the code to pick the
last unused dpll rather than the first unused one like we did before.

While there should most likely be no harm in changing the order
let's change back just to avoid a change in the behaviour. At
least it might reduce the confusion when staring at logs (took
me a while to figure out why DPLL1 being picked over DPLL0
when the latter was most definitely available).

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190130181359.20693-1-ville.syrjala@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
2019-01-31 09:46:02 +02:00

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/*
* Copyright © 2006-2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "intel_drv.h"
/**
* DOC: Display PLLs
*
* Display PLLs used for driving outputs vary by platform. While some have
* per-pipe or per-encoder dedicated PLLs, others allow the use of any PLL
* from a pool. In the latter scenario, it is possible that multiple pipes
* share a PLL if their configurations match.
*
* This file provides an abstraction over display PLLs. The function
* intel_shared_dpll_init() initializes the PLLs for the given platform. The
* users of a PLL are tracked and that tracking is integrated with the atomic
* modest interface. During an atomic operation, a PLL can be requested for a
* given CRTC and encoder configuration by calling intel_get_shared_dpll() and
* a previously used PLL can be released with intel_release_shared_dpll().
* Changes to the users are first staged in the atomic state, and then made
* effective by calling intel_shared_dpll_swap_state() during the atomic
* commit phase.
*/
static void
intel_atomic_duplicate_dpll_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll_state *shared_dpll)
{
enum intel_dpll_id i;
/* Copy shared dpll state */
for (i = 0; i < dev_priv->num_shared_dpll; i++) {
struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];
shared_dpll[i] = pll->state;
}
}
static struct intel_shared_dpll_state *
intel_atomic_get_shared_dpll_state(struct drm_atomic_state *s)
{
struct intel_atomic_state *state = to_intel_atomic_state(s);
WARN_ON(!drm_modeset_is_locked(&s->dev->mode_config.connection_mutex));
if (!state->dpll_set) {
state->dpll_set = true;
intel_atomic_duplicate_dpll_state(to_i915(s->dev),
state->shared_dpll);
}
return state->shared_dpll;
}
/**
* intel_get_shared_dpll_by_id - get a DPLL given its id
* @dev_priv: i915 device instance
* @id: pll id
*
* Returns:
* A pointer to the DPLL with @id
*/
struct intel_shared_dpll *
intel_get_shared_dpll_by_id(struct drm_i915_private *dev_priv,
enum intel_dpll_id id)
{
return &dev_priv->shared_dplls[id];
}
/**
* intel_get_shared_dpll_id - get the id of a DPLL
* @dev_priv: i915 device instance
* @pll: the DPLL
*
* Returns:
* The id of @pll
*/
enum intel_dpll_id
intel_get_shared_dpll_id(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
if (WARN_ON(pll < dev_priv->shared_dplls||
pll > &dev_priv->shared_dplls[dev_priv->num_shared_dpll]))
return -1;
return (enum intel_dpll_id) (pll - dev_priv->shared_dplls);
}
/* For ILK+ */
void assert_shared_dpll(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
bool state)
{
bool cur_state;
struct intel_dpll_hw_state hw_state;
if (WARN(!pll, "asserting DPLL %s with no DPLL\n", onoff(state)))
return;
cur_state = pll->info->funcs->get_hw_state(dev_priv, pll, &hw_state);
I915_STATE_WARN(cur_state != state,
"%s assertion failure (expected %s, current %s)\n",
pll->info->name, onoff(state), onoff(cur_state));
}
/**
* intel_prepare_shared_dpll - call a dpll's prepare hook
* @crtc_state: CRTC, and its state, which has a shared dpll
*
* This calls the PLL's prepare hook if it has one and if the PLL is not
* already enabled. The prepare hook is platform specific.
*/
void intel_prepare_shared_dpll(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll = crtc_state->shared_dpll;
if (WARN_ON(pll == NULL))
return;
mutex_lock(&dev_priv->dpll_lock);
WARN_ON(!pll->state.crtc_mask);
if (!pll->active_mask) {
DRM_DEBUG_DRIVER("setting up %s\n", pll->info->name);
WARN_ON(pll->on);
assert_shared_dpll_disabled(dev_priv, pll);
pll->info->funcs->prepare(dev_priv, pll);
}
mutex_unlock(&dev_priv->dpll_lock);
}
/**
* intel_enable_shared_dpll - enable a CRTC's shared DPLL
* @crtc_state: CRTC, and its state, which has a shared DPLL
*
* Enable the shared DPLL used by @crtc.
*/
void intel_enable_shared_dpll(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll = crtc_state->shared_dpll;
unsigned int crtc_mask = drm_crtc_mask(&crtc->base);
unsigned int old_mask;
if (WARN_ON(pll == NULL))
return;
mutex_lock(&dev_priv->dpll_lock);
old_mask = pll->active_mask;
if (WARN_ON(!(pll->state.crtc_mask & crtc_mask)) ||
WARN_ON(pll->active_mask & crtc_mask))
goto out;
pll->active_mask |= crtc_mask;
DRM_DEBUG_KMS("enable %s (active %x, on? %d) for crtc %d\n",
pll->info->name, pll->active_mask, pll->on,
crtc->base.base.id);
if (old_mask) {
WARN_ON(!pll->on);
assert_shared_dpll_enabled(dev_priv, pll);
goto out;
}
WARN_ON(pll->on);
DRM_DEBUG_KMS("enabling %s\n", pll->info->name);
pll->info->funcs->enable(dev_priv, pll);
pll->on = true;
out:
mutex_unlock(&dev_priv->dpll_lock);
}
/**
* intel_disable_shared_dpll - disable a CRTC's shared DPLL
* @crtc_state: CRTC, and its state, which has a shared DPLL
*
* Disable the shared DPLL used by @crtc.
*/
void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll = crtc_state->shared_dpll;
unsigned int crtc_mask = drm_crtc_mask(&crtc->base);
/* PCH only available on ILK+ */
if (INTEL_GEN(dev_priv) < 5)
return;
if (pll == NULL)
return;
mutex_lock(&dev_priv->dpll_lock);
if (WARN_ON(!(pll->active_mask & crtc_mask)))
goto out;
DRM_DEBUG_KMS("disable %s (active %x, on? %d) for crtc %d\n",
pll->info->name, pll->active_mask, pll->on,
crtc->base.base.id);
assert_shared_dpll_enabled(dev_priv, pll);
WARN_ON(!pll->on);
pll->active_mask &= ~crtc_mask;
if (pll->active_mask)
goto out;
DRM_DEBUG_KMS("disabling %s\n", pll->info->name);
pll->info->funcs->disable(dev_priv, pll);
pll->on = false;
out:
mutex_unlock(&dev_priv->dpll_lock);
}
static struct intel_shared_dpll *
intel_find_shared_dpll(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
enum intel_dpll_id range_min,
enum intel_dpll_id range_max)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll, *unused_pll = NULL;
struct intel_shared_dpll_state *shared_dpll;
enum intel_dpll_id i;
shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
for (i = range_min; i <= range_max; i++) {
pll = &dev_priv->shared_dplls[i];
/* Only want to check enabled timings first */
if (shared_dpll[i].crtc_mask == 0) {
if (!unused_pll)
unused_pll = pll;
continue;
}
if (memcmp(&crtc_state->dpll_hw_state,
&shared_dpll[i].hw_state,
sizeof(crtc_state->dpll_hw_state)) == 0) {
DRM_DEBUG_KMS("[CRTC:%d:%s] sharing existing %s (crtc mask 0x%08x, active %x)\n",
crtc->base.base.id, crtc->base.name,
pll->info->name,
shared_dpll[i].crtc_mask,
pll->active_mask);
return pll;
}
}
/* Ok no matching timings, maybe there's a free one? */
if (unused_pll) {
DRM_DEBUG_KMS("[CRTC:%d:%s] allocated %s\n",
crtc->base.base.id, crtc->base.name,
unused_pll->info->name);
return unused_pll;
}
return NULL;
}
static void
intel_reference_shared_dpll(struct intel_shared_dpll *pll,
struct intel_crtc_state *crtc_state)
{
struct intel_shared_dpll_state *shared_dpll;
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
const enum intel_dpll_id id = pll->info->id;
shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
if (shared_dpll[id].crtc_mask == 0)
shared_dpll[id].hw_state =
crtc_state->dpll_hw_state;
crtc_state->shared_dpll = pll;
DRM_DEBUG_DRIVER("using %s for pipe %c\n", pll->info->name,
pipe_name(crtc->pipe));
shared_dpll[id].crtc_mask |= 1 << crtc->pipe;
}
/**
* intel_shared_dpll_swap_state - make atomic DPLL configuration effective
* @state: atomic state
*
* This is the dpll version of drm_atomic_helper_swap_state() since the
* helper does not handle driver-specific global state.
*
* For consistency with atomic helpers this function does a complete swap,
* i.e. it also puts the current state into @state, even though there is no
* need for that at this moment.
*/
void intel_shared_dpll_swap_state(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_shared_dpll_state *shared_dpll;
struct intel_shared_dpll *pll;
enum intel_dpll_id i;
if (!to_intel_atomic_state(state)->dpll_set)
return;
shared_dpll = to_intel_atomic_state(state)->shared_dpll;
for (i = 0; i < dev_priv->num_shared_dpll; i++) {
struct intel_shared_dpll_state tmp;
pll = &dev_priv->shared_dplls[i];
tmp = pll->state;
pll->state = shared_dpll[i];
shared_dpll[i] = tmp;
}
}
static bool ibx_pch_dpll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
u32 val;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
val = I915_READ(PCH_DPLL(id));
hw_state->dpll = val;
hw_state->fp0 = I915_READ(PCH_FP0(id));
hw_state->fp1 = I915_READ(PCH_FP1(id));
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return val & DPLL_VCO_ENABLE;
}
static void ibx_pch_dpll_prepare(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
I915_WRITE(PCH_FP0(id), pll->state.hw_state.fp0);
I915_WRITE(PCH_FP1(id), pll->state.hw_state.fp1);
}
static void ibx_assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
{
u32 val;
bool enabled;
I915_STATE_WARN_ON(!(HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv)));
val = I915_READ(PCH_DREF_CONTROL);
enabled = !!(val & (DREF_SSC_SOURCE_MASK | DREF_NONSPREAD_SOURCE_MASK |
DREF_SUPERSPREAD_SOURCE_MASK));
I915_STATE_WARN(!enabled, "PCH refclk assertion failure, should be active but is disabled\n");
}
static void ibx_pch_dpll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
/* PCH refclock must be enabled first */
ibx_assert_pch_refclk_enabled(dev_priv);
I915_WRITE(PCH_DPLL(id), pll->state.hw_state.dpll);
/* Wait for the clocks to stabilize. */
POSTING_READ(PCH_DPLL(id));
udelay(150);
/* The pixel multiplier can only be updated once the
* DPLL is enabled and the clocks are stable.
*
* So write it again.
*/
I915_WRITE(PCH_DPLL(id), pll->state.hw_state.dpll);
POSTING_READ(PCH_DPLL(id));
udelay(200);
}
static void ibx_pch_dpll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
I915_WRITE(PCH_DPLL(id), 0);
POSTING_READ(PCH_DPLL(id));
udelay(200);
}
static struct intel_shared_dpll *
ibx_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll;
enum intel_dpll_id i;
if (HAS_PCH_IBX(dev_priv)) {
/* Ironlake PCH has a fixed PLL->PCH pipe mapping. */
i = (enum intel_dpll_id) crtc->pipe;
pll = &dev_priv->shared_dplls[i];
DRM_DEBUG_KMS("[CRTC:%d:%s] using pre-allocated %s\n",
crtc->base.base.id, crtc->base.name,
pll->info->name);
} else {
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_PCH_PLL_A,
DPLL_ID_PCH_PLL_B);
}
if (!pll)
return NULL;
/* reference the pll */
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static void ibx_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: dpll: 0x%x, dpll_md: 0x%x, "
"fp0: 0x%x, fp1: 0x%x\n",
hw_state->dpll,
hw_state->dpll_md,
hw_state->fp0,
hw_state->fp1);
}
static const struct intel_shared_dpll_funcs ibx_pch_dpll_funcs = {
.prepare = ibx_pch_dpll_prepare,
.enable = ibx_pch_dpll_enable,
.disable = ibx_pch_dpll_disable,
.get_hw_state = ibx_pch_dpll_get_hw_state,
};
static void hsw_ddi_wrpll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
I915_WRITE(WRPLL_CTL(id), pll->state.hw_state.wrpll);
POSTING_READ(WRPLL_CTL(id));
udelay(20);
}
static void hsw_ddi_spll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
I915_WRITE(SPLL_CTL, pll->state.hw_state.spll);
POSTING_READ(SPLL_CTL);
udelay(20);
}
static void hsw_ddi_wrpll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
u32 val;
val = I915_READ(WRPLL_CTL(id));
I915_WRITE(WRPLL_CTL(id), val & ~WRPLL_PLL_ENABLE);
POSTING_READ(WRPLL_CTL(id));
}
static void hsw_ddi_spll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
u32 val;
val = I915_READ(SPLL_CTL);
I915_WRITE(SPLL_CTL, val & ~SPLL_PLL_ENABLE);
POSTING_READ(SPLL_CTL);
}
static bool hsw_ddi_wrpll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
u32 val;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
val = I915_READ(WRPLL_CTL(id));
hw_state->wrpll = val;
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return val & WRPLL_PLL_ENABLE;
}
static bool hsw_ddi_spll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
intel_wakeref_t wakeref;
u32 val;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
val = I915_READ(SPLL_CTL);
hw_state->spll = val;
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return val & SPLL_PLL_ENABLE;
}
#define LC_FREQ 2700
#define LC_FREQ_2K U64_C(LC_FREQ * 2000)
#define P_MIN 2
#define P_MAX 64
#define P_INC 2
/* Constraints for PLL good behavior */
#define REF_MIN 48
#define REF_MAX 400
#define VCO_MIN 2400
#define VCO_MAX 4800
struct hsw_wrpll_rnp {
unsigned p, n2, r2;
};
static unsigned hsw_wrpll_get_budget_for_freq(int clock)
{
unsigned budget;
switch (clock) {
case 25175000:
case 25200000:
case 27000000:
case 27027000:
case 37762500:
case 37800000:
case 40500000:
case 40541000:
case 54000000:
case 54054000:
case 59341000:
case 59400000:
case 72000000:
case 74176000:
case 74250000:
case 81000000:
case 81081000:
case 89012000:
case 89100000:
case 108000000:
case 108108000:
case 111264000:
case 111375000:
case 148352000:
case 148500000:
case 162000000:
case 162162000:
case 222525000:
case 222750000:
case 296703000:
case 297000000:
budget = 0;
break;
case 233500000:
case 245250000:
case 247750000:
case 253250000:
case 298000000:
budget = 1500;
break;
case 169128000:
case 169500000:
case 179500000:
case 202000000:
budget = 2000;
break;
case 256250000:
case 262500000:
case 270000000:
case 272500000:
case 273750000:
case 280750000:
case 281250000:
case 286000000:
case 291750000:
budget = 4000;
break;
case 267250000:
case 268500000:
budget = 5000;
break;
default:
budget = 1000;
break;
}
return budget;
}
static void hsw_wrpll_update_rnp(u64 freq2k, unsigned int budget,
unsigned int r2, unsigned int n2,
unsigned int p,
struct hsw_wrpll_rnp *best)
{
u64 a, b, c, d, diff, diff_best;
/* No best (r,n,p) yet */
if (best->p == 0) {
best->p = p;
best->n2 = n2;
best->r2 = r2;
return;
}
/*
* Output clock is (LC_FREQ_2K / 2000) * N / (P * R), which compares to
* freq2k.
*
* delta = 1e6 *
* abs(freq2k - (LC_FREQ_2K * n2/(p * r2))) /
* freq2k;
*
* and we would like delta <= budget.
*
* If the discrepancy is above the PPM-based budget, always prefer to
* improve upon the previous solution. However, if you're within the
* budget, try to maximize Ref * VCO, that is N / (P * R^2).
*/
a = freq2k * budget * p * r2;
b = freq2k * budget * best->p * best->r2;
diff = abs_diff(freq2k * p * r2, LC_FREQ_2K * n2);
diff_best = abs_diff(freq2k * best->p * best->r2,
LC_FREQ_2K * best->n2);
c = 1000000 * diff;
d = 1000000 * diff_best;
if (a < c && b < d) {
/* If both are above the budget, pick the closer */
if (best->p * best->r2 * diff < p * r2 * diff_best) {
best->p = p;
best->n2 = n2;
best->r2 = r2;
}
} else if (a >= c && b < d) {
/* If A is below the threshold but B is above it? Update. */
best->p = p;
best->n2 = n2;
best->r2 = r2;
} else if (a >= c && b >= d) {
/* Both are below the limit, so pick the higher n2/(r2*r2) */
if (n2 * best->r2 * best->r2 > best->n2 * r2 * r2) {
best->p = p;
best->n2 = n2;
best->r2 = r2;
}
}
/* Otherwise a < c && b >= d, do nothing */
}
static void
hsw_ddi_calculate_wrpll(int clock /* in Hz */,
unsigned *r2_out, unsigned *n2_out, unsigned *p_out)
{
u64 freq2k;
unsigned p, n2, r2;
struct hsw_wrpll_rnp best = { 0, 0, 0 };
unsigned budget;
freq2k = clock / 100;
budget = hsw_wrpll_get_budget_for_freq(clock);
/* Special case handling for 540 pixel clock: bypass WR PLL entirely
* and directly pass the LC PLL to it. */
if (freq2k == 5400000) {
*n2_out = 2;
*p_out = 1;
*r2_out = 2;
return;
}
/*
* Ref = LC_FREQ / R, where Ref is the actual reference input seen by
* the WR PLL.
*
* We want R so that REF_MIN <= Ref <= REF_MAX.
* Injecting R2 = 2 * R gives:
* REF_MAX * r2 > LC_FREQ * 2 and
* REF_MIN * r2 < LC_FREQ * 2
*
* Which means the desired boundaries for r2 are:
* LC_FREQ * 2 / REF_MAX < r2 < LC_FREQ * 2 / REF_MIN
*
*/
for (r2 = LC_FREQ * 2 / REF_MAX + 1;
r2 <= LC_FREQ * 2 / REF_MIN;
r2++) {
/*
* VCO = N * Ref, that is: VCO = N * LC_FREQ / R
*
* Once again we want VCO_MIN <= VCO <= VCO_MAX.
* Injecting R2 = 2 * R and N2 = 2 * N, we get:
* VCO_MAX * r2 > n2 * LC_FREQ and
* VCO_MIN * r2 < n2 * LC_FREQ)
*
* Which means the desired boundaries for n2 are:
* VCO_MIN * r2 / LC_FREQ < n2 < VCO_MAX * r2 / LC_FREQ
*/
for (n2 = VCO_MIN * r2 / LC_FREQ + 1;
n2 <= VCO_MAX * r2 / LC_FREQ;
n2++) {
for (p = P_MIN; p <= P_MAX; p += P_INC)
hsw_wrpll_update_rnp(freq2k, budget,
r2, n2, p, &best);
}
}
*n2_out = best.n2;
*p_out = best.p;
*r2_out = best.r2;
}
static struct intel_shared_dpll *hsw_ddi_hdmi_get_dpll(int clock,
struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state)
{
struct intel_shared_dpll *pll;
u32 val;
unsigned int p, n2, r2;
hsw_ddi_calculate_wrpll(clock * 1000, &r2, &n2, &p);
val = WRPLL_PLL_ENABLE | WRPLL_PLL_LCPLL |
WRPLL_DIVIDER_REFERENCE(r2) | WRPLL_DIVIDER_FEEDBACK(n2) |
WRPLL_DIVIDER_POST(p);
crtc_state->dpll_hw_state.wrpll = val;
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_WRPLL1, DPLL_ID_WRPLL2);
if (!pll)
return NULL;
return pll;
}
static struct intel_shared_dpll *
hsw_ddi_dp_get_dpll(struct intel_encoder *encoder, int clock)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_shared_dpll *pll;
enum intel_dpll_id pll_id;
switch (clock / 2) {
case 81000:
pll_id = DPLL_ID_LCPLL_810;
break;
case 135000:
pll_id = DPLL_ID_LCPLL_1350;
break;
case 270000:
pll_id = DPLL_ID_LCPLL_2700;
break;
default:
DRM_DEBUG_KMS("Invalid clock for DP: %d\n", clock);
return NULL;
}
pll = intel_get_shared_dpll_by_id(dev_priv, pll_id);
if (!pll)
return NULL;
return pll;
}
static struct intel_shared_dpll *
hsw_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct intel_shared_dpll *pll;
int clock = crtc_state->port_clock;
memset(&crtc_state->dpll_hw_state, 0,
sizeof(crtc_state->dpll_hw_state));
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
pll = hsw_ddi_hdmi_get_dpll(clock, crtc, crtc_state);
} else if (intel_crtc_has_dp_encoder(crtc_state)) {
pll = hsw_ddi_dp_get_dpll(encoder, clock);
} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
if (WARN_ON(crtc_state->port_clock / 2 != 135000))
return NULL;
crtc_state->dpll_hw_state.spll =
SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC;
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_SPLL, DPLL_ID_SPLL);
} else {
return NULL;
}
if (!pll)
return NULL;
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static void hsw_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: wrpll: 0x%x spll: 0x%x\n",
hw_state->wrpll, hw_state->spll);
}
static const struct intel_shared_dpll_funcs hsw_ddi_wrpll_funcs = {
.enable = hsw_ddi_wrpll_enable,
.disable = hsw_ddi_wrpll_disable,
.get_hw_state = hsw_ddi_wrpll_get_hw_state,
};
static const struct intel_shared_dpll_funcs hsw_ddi_spll_funcs = {
.enable = hsw_ddi_spll_enable,
.disable = hsw_ddi_spll_disable,
.get_hw_state = hsw_ddi_spll_get_hw_state,
};
static void hsw_ddi_lcpll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
}
static void hsw_ddi_lcpll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
}
static bool hsw_ddi_lcpll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
return true;
}
static const struct intel_shared_dpll_funcs hsw_ddi_lcpll_funcs = {
.enable = hsw_ddi_lcpll_enable,
.disable = hsw_ddi_lcpll_disable,
.get_hw_state = hsw_ddi_lcpll_get_hw_state,
};
struct skl_dpll_regs {
i915_reg_t ctl, cfgcr1, cfgcr2;
};
/* this array is indexed by the *shared* pll id */
static const struct skl_dpll_regs skl_dpll_regs[4] = {
{
/* DPLL 0 */
.ctl = LCPLL1_CTL,
/* DPLL 0 doesn't support HDMI mode */
},
{
/* DPLL 1 */
.ctl = LCPLL2_CTL,
.cfgcr1 = DPLL_CFGCR1(SKL_DPLL1),
.cfgcr2 = DPLL_CFGCR2(SKL_DPLL1),
},
{
/* DPLL 2 */
.ctl = WRPLL_CTL(0),
.cfgcr1 = DPLL_CFGCR1(SKL_DPLL2),
.cfgcr2 = DPLL_CFGCR2(SKL_DPLL2),
},
{
/* DPLL 3 */
.ctl = WRPLL_CTL(1),
.cfgcr1 = DPLL_CFGCR1(SKL_DPLL3),
.cfgcr2 = DPLL_CFGCR2(SKL_DPLL3),
},
};
static void skl_ddi_pll_write_ctrl1(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
u32 val;
val = I915_READ(DPLL_CTRL1);
val &= ~(DPLL_CTRL1_HDMI_MODE(id) |
DPLL_CTRL1_SSC(id) |
DPLL_CTRL1_LINK_RATE_MASK(id));
val |= pll->state.hw_state.ctrl1 << (id * 6);
I915_WRITE(DPLL_CTRL1, val);
POSTING_READ(DPLL_CTRL1);
}
static void skl_ddi_pll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const struct skl_dpll_regs *regs = skl_dpll_regs;
const enum intel_dpll_id id = pll->info->id;
skl_ddi_pll_write_ctrl1(dev_priv, pll);
I915_WRITE(regs[id].cfgcr1, pll->state.hw_state.cfgcr1);
I915_WRITE(regs[id].cfgcr2, pll->state.hw_state.cfgcr2);
POSTING_READ(regs[id].cfgcr1);
POSTING_READ(regs[id].cfgcr2);
/* the enable bit is always bit 31 */
I915_WRITE(regs[id].ctl,
I915_READ(regs[id].ctl) | LCPLL_PLL_ENABLE);
if (intel_wait_for_register(dev_priv,
DPLL_STATUS,
DPLL_LOCK(id),
DPLL_LOCK(id),
5))
DRM_ERROR("DPLL %d not locked\n", id);
}
static void skl_ddi_dpll0_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
skl_ddi_pll_write_ctrl1(dev_priv, pll);
}
static void skl_ddi_pll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const struct skl_dpll_regs *regs = skl_dpll_regs;
const enum intel_dpll_id id = pll->info->id;
/* the enable bit is always bit 31 */
I915_WRITE(regs[id].ctl,
I915_READ(regs[id].ctl) & ~LCPLL_PLL_ENABLE);
POSTING_READ(regs[id].ctl);
}
static void skl_ddi_dpll0_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
}
static bool skl_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
u32 val;
const struct skl_dpll_regs *regs = skl_dpll_regs;
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
bool ret;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
ret = false;
val = I915_READ(regs[id].ctl);
if (!(val & LCPLL_PLL_ENABLE))
goto out;
val = I915_READ(DPLL_CTRL1);
hw_state->ctrl1 = (val >> (id * 6)) & 0x3f;
/* avoid reading back stale values if HDMI mode is not enabled */
if (val & DPLL_CTRL1_HDMI_MODE(id)) {
hw_state->cfgcr1 = I915_READ(regs[id].cfgcr1);
hw_state->cfgcr2 = I915_READ(regs[id].cfgcr2);
}
ret = true;
out:
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return ret;
}
static bool skl_ddi_dpll0_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
const struct skl_dpll_regs *regs = skl_dpll_regs;
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
u32 val;
bool ret;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
ret = false;
/* DPLL0 is always enabled since it drives CDCLK */
val = I915_READ(regs[id].ctl);
if (WARN_ON(!(val & LCPLL_PLL_ENABLE)))
goto out;
val = I915_READ(DPLL_CTRL1);
hw_state->ctrl1 = (val >> (id * 6)) & 0x3f;
ret = true;
out:
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return ret;
}
struct skl_wrpll_context {
u64 min_deviation; /* current minimal deviation */
u64 central_freq; /* chosen central freq */
u64 dco_freq; /* chosen dco freq */
unsigned int p; /* chosen divider */
};
static void skl_wrpll_context_init(struct skl_wrpll_context *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->min_deviation = U64_MAX;
}
/* DCO freq must be within +1%/-6% of the DCO central freq */
#define SKL_DCO_MAX_PDEVIATION 100
#define SKL_DCO_MAX_NDEVIATION 600
static void skl_wrpll_try_divider(struct skl_wrpll_context *ctx,
u64 central_freq,
u64 dco_freq,
unsigned int divider)
{
u64 deviation;
deviation = div64_u64(10000 * abs_diff(dco_freq, central_freq),
central_freq);
/* positive deviation */
if (dco_freq >= central_freq) {
if (deviation < SKL_DCO_MAX_PDEVIATION &&
deviation < ctx->min_deviation) {
ctx->min_deviation = deviation;
ctx->central_freq = central_freq;
ctx->dco_freq = dco_freq;
ctx->p = divider;
}
/* negative deviation */
} else if (deviation < SKL_DCO_MAX_NDEVIATION &&
deviation < ctx->min_deviation) {
ctx->min_deviation = deviation;
ctx->central_freq = central_freq;
ctx->dco_freq = dco_freq;
ctx->p = divider;
}
}
static void skl_wrpll_get_multipliers(unsigned int p,
unsigned int *p0 /* out */,
unsigned int *p1 /* out */,
unsigned int *p2 /* out */)
{
/* even dividers */
if (p % 2 == 0) {
unsigned int half = p / 2;
if (half == 1 || half == 2 || half == 3 || half == 5) {
*p0 = 2;
*p1 = 1;
*p2 = half;
} else if (half % 2 == 0) {
*p0 = 2;
*p1 = half / 2;
*p2 = 2;
} else if (half % 3 == 0) {
*p0 = 3;
*p1 = half / 3;
*p2 = 2;
} else if (half % 7 == 0) {
*p0 = 7;
*p1 = half / 7;
*p2 = 2;
}
} else if (p == 3 || p == 9) { /* 3, 5, 7, 9, 15, 21, 35 */
*p0 = 3;
*p1 = 1;
*p2 = p / 3;
} else if (p == 5 || p == 7) {
*p0 = p;
*p1 = 1;
*p2 = 1;
} else if (p == 15) {
*p0 = 3;
*p1 = 1;
*p2 = 5;
} else if (p == 21) {
*p0 = 7;
*p1 = 1;
*p2 = 3;
} else if (p == 35) {
*p0 = 7;
*p1 = 1;
*p2 = 5;
}
}
struct skl_wrpll_params {
u32 dco_fraction;
u32 dco_integer;
u32 qdiv_ratio;
u32 qdiv_mode;
u32 kdiv;
u32 pdiv;
u32 central_freq;
};
static void skl_wrpll_params_populate(struct skl_wrpll_params *params,
u64 afe_clock,
u64 central_freq,
u32 p0, u32 p1, u32 p2)
{
u64 dco_freq;
switch (central_freq) {
case 9600000000ULL:
params->central_freq = 0;
break;
case 9000000000ULL:
params->central_freq = 1;
break;
case 8400000000ULL:
params->central_freq = 3;
}
switch (p0) {
case 1:
params->pdiv = 0;
break;
case 2:
params->pdiv = 1;
break;
case 3:
params->pdiv = 2;
break;
case 7:
params->pdiv = 4;
break;
default:
WARN(1, "Incorrect PDiv\n");
}
switch (p2) {
case 5:
params->kdiv = 0;
break;
case 2:
params->kdiv = 1;
break;
case 3:
params->kdiv = 2;
break;
case 1:
params->kdiv = 3;
break;
default:
WARN(1, "Incorrect KDiv\n");
}
params->qdiv_ratio = p1;
params->qdiv_mode = (params->qdiv_ratio == 1) ? 0 : 1;
dco_freq = p0 * p1 * p2 * afe_clock;
/*
* Intermediate values are in Hz.
* Divide by MHz to match bsepc
*/
params->dco_integer = div_u64(dco_freq, 24 * MHz(1));
params->dco_fraction =
div_u64((div_u64(dco_freq, 24) -
params->dco_integer * MHz(1)) * 0x8000, MHz(1));
}
static bool
skl_ddi_calculate_wrpll(int clock /* in Hz */,
struct skl_wrpll_params *wrpll_params)
{
u64 afe_clock = clock * 5; /* AFE Clock is 5x Pixel clock */
u64 dco_central_freq[3] = { 8400000000ULL,
9000000000ULL,
9600000000ULL };
static const int even_dividers[] = { 4, 6, 8, 10, 12, 14, 16, 18, 20,
24, 28, 30, 32, 36, 40, 42, 44,
48, 52, 54, 56, 60, 64, 66, 68,
70, 72, 76, 78, 80, 84, 88, 90,
92, 96, 98 };
static const int odd_dividers[] = { 3, 5, 7, 9, 15, 21, 35 };
static const struct {
const int *list;
int n_dividers;
} dividers[] = {
{ even_dividers, ARRAY_SIZE(even_dividers) },
{ odd_dividers, ARRAY_SIZE(odd_dividers) },
};
struct skl_wrpll_context ctx;
unsigned int dco, d, i;
unsigned int p0, p1, p2;
skl_wrpll_context_init(&ctx);
for (d = 0; d < ARRAY_SIZE(dividers); d++) {
for (dco = 0; dco < ARRAY_SIZE(dco_central_freq); dco++) {
for (i = 0; i < dividers[d].n_dividers; i++) {
unsigned int p = dividers[d].list[i];
u64 dco_freq = p * afe_clock;
skl_wrpll_try_divider(&ctx,
dco_central_freq[dco],
dco_freq,
p);
/*
* Skip the remaining dividers if we're sure to
* have found the definitive divider, we can't
* improve a 0 deviation.
*/
if (ctx.min_deviation == 0)
goto skip_remaining_dividers;
}
}
skip_remaining_dividers:
/*
* If a solution is found with an even divider, prefer
* this one.
*/
if (d == 0 && ctx.p)
break;
}
if (!ctx.p) {
DRM_DEBUG_DRIVER("No valid divider found for %dHz\n", clock);
return false;
}
/*
* gcc incorrectly analyses that these can be used without being
* initialized. To be fair, it's hard to guess.
*/
p0 = p1 = p2 = 0;
skl_wrpll_get_multipliers(ctx.p, &p0, &p1, &p2);
skl_wrpll_params_populate(wrpll_params, afe_clock, ctx.central_freq,
p0, p1, p2);
return true;
}
static bool skl_ddi_hdmi_pll_dividers(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
int clock)
{
u32 ctrl1, cfgcr1, cfgcr2;
struct skl_wrpll_params wrpll_params = { 0, };
/*
* See comment in intel_dpll_hw_state to understand why we always use 0
* as the DPLL id in this function.
*/
ctrl1 = DPLL_CTRL1_OVERRIDE(0);
ctrl1 |= DPLL_CTRL1_HDMI_MODE(0);
if (!skl_ddi_calculate_wrpll(clock * 1000, &wrpll_params))
return false;
cfgcr1 = DPLL_CFGCR1_FREQ_ENABLE |
DPLL_CFGCR1_DCO_FRACTION(wrpll_params.dco_fraction) |
wrpll_params.dco_integer;
cfgcr2 = DPLL_CFGCR2_QDIV_RATIO(wrpll_params.qdiv_ratio) |
DPLL_CFGCR2_QDIV_MODE(wrpll_params.qdiv_mode) |
DPLL_CFGCR2_KDIV(wrpll_params.kdiv) |
DPLL_CFGCR2_PDIV(wrpll_params.pdiv) |
wrpll_params.central_freq;
memset(&crtc_state->dpll_hw_state, 0,
sizeof(crtc_state->dpll_hw_state));
crtc_state->dpll_hw_state.ctrl1 = ctrl1;
crtc_state->dpll_hw_state.cfgcr1 = cfgcr1;
crtc_state->dpll_hw_state.cfgcr2 = cfgcr2;
return true;
}
static bool
skl_ddi_dp_set_dpll_hw_state(int clock,
struct intel_dpll_hw_state *dpll_hw_state)
{
u32 ctrl1;
/*
* See comment in intel_dpll_hw_state to understand why we always use 0
* as the DPLL id in this function.
*/
ctrl1 = DPLL_CTRL1_OVERRIDE(0);
switch (clock / 2) {
case 81000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, 0);
break;
case 135000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1350, 0);
break;
case 270000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2700, 0);
break;
/* eDP 1.4 rates */
case 162000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1620, 0);
break;
case 108000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, 0);
break;
case 216000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2160, 0);
break;
}
dpll_hw_state->ctrl1 = ctrl1;
return true;
}
static struct intel_shared_dpll *
skl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct intel_shared_dpll *pll;
int clock = crtc_state->port_clock;
bool bret;
struct intel_dpll_hw_state dpll_hw_state;
memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
bret = skl_ddi_hdmi_pll_dividers(crtc, crtc_state, clock);
if (!bret) {
DRM_DEBUG_KMS("Could not get HDMI pll dividers.\n");
return NULL;
}
} else if (intel_crtc_has_dp_encoder(crtc_state)) {
bret = skl_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state);
if (!bret) {
DRM_DEBUG_KMS("Could not set DP dpll HW state.\n");
return NULL;
}
crtc_state->dpll_hw_state = dpll_hw_state;
} else {
return NULL;
}
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_SKL_DPLL0,
DPLL_ID_SKL_DPLL0);
else
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_SKL_DPLL1,
DPLL_ID_SKL_DPLL3);
if (!pll)
return NULL;
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static void skl_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: "
"ctrl1: 0x%x, cfgcr1: 0x%x, cfgcr2: 0x%x\n",
hw_state->ctrl1,
hw_state->cfgcr1,
hw_state->cfgcr2);
}
static const struct intel_shared_dpll_funcs skl_ddi_pll_funcs = {
.enable = skl_ddi_pll_enable,
.disable = skl_ddi_pll_disable,
.get_hw_state = skl_ddi_pll_get_hw_state,
};
static const struct intel_shared_dpll_funcs skl_ddi_dpll0_funcs = {
.enable = skl_ddi_dpll0_enable,
.disable = skl_ddi_dpll0_disable,
.get_hw_state = skl_ddi_dpll0_get_hw_state,
};
static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
u32 temp;
enum port port = (enum port)pll->info->id; /* 1:1 port->PLL mapping */
enum dpio_phy phy;
enum dpio_channel ch;
bxt_port_to_phy_channel(dev_priv, port, &phy, &ch);
/* Non-SSC reference */
temp = I915_READ(BXT_PORT_PLL_ENABLE(port));
temp |= PORT_PLL_REF_SEL;
I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp);
if (IS_GEMINILAKE(dev_priv)) {
temp = I915_READ(BXT_PORT_PLL_ENABLE(port));
temp |= PORT_PLL_POWER_ENABLE;
I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp);
if (wait_for_us((I915_READ(BXT_PORT_PLL_ENABLE(port)) &
PORT_PLL_POWER_STATE), 200))
DRM_ERROR("Power state not set for PLL:%d\n", port);
}
/* Disable 10 bit clock */
temp = I915_READ(BXT_PORT_PLL_EBB_4(phy, ch));
temp &= ~PORT_PLL_10BIT_CLK_ENABLE;
I915_WRITE(BXT_PORT_PLL_EBB_4(phy, ch), temp);
/* Write P1 & P2 */
temp = I915_READ(BXT_PORT_PLL_EBB_0(phy, ch));
temp &= ~(PORT_PLL_P1_MASK | PORT_PLL_P2_MASK);
temp |= pll->state.hw_state.ebb0;
I915_WRITE(BXT_PORT_PLL_EBB_0(phy, ch), temp);
/* Write M2 integer */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 0));
temp &= ~PORT_PLL_M2_MASK;
temp |= pll->state.hw_state.pll0;
I915_WRITE(BXT_PORT_PLL(phy, ch, 0), temp);
/* Write N */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 1));
temp &= ~PORT_PLL_N_MASK;
temp |= pll->state.hw_state.pll1;
I915_WRITE(BXT_PORT_PLL(phy, ch, 1), temp);
/* Write M2 fraction */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 2));
temp &= ~PORT_PLL_M2_FRAC_MASK;
temp |= pll->state.hw_state.pll2;
I915_WRITE(BXT_PORT_PLL(phy, ch, 2), temp);
/* Write M2 fraction enable */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 3));
temp &= ~PORT_PLL_M2_FRAC_ENABLE;
temp |= pll->state.hw_state.pll3;
I915_WRITE(BXT_PORT_PLL(phy, ch, 3), temp);
/* Write coeff */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 6));
temp &= ~PORT_PLL_PROP_COEFF_MASK;
temp &= ~PORT_PLL_INT_COEFF_MASK;
temp &= ~PORT_PLL_GAIN_CTL_MASK;
temp |= pll->state.hw_state.pll6;
I915_WRITE(BXT_PORT_PLL(phy, ch, 6), temp);
/* Write calibration val */
temp = I915_READ(BXT_PORT_PLL(phy, ch, 8));
temp &= ~PORT_PLL_TARGET_CNT_MASK;
temp |= pll->state.hw_state.pll8;
I915_WRITE(BXT_PORT_PLL(phy, ch, 8), temp);
temp = I915_READ(BXT_PORT_PLL(phy, ch, 9));
temp &= ~PORT_PLL_LOCK_THRESHOLD_MASK;
temp |= pll->state.hw_state.pll9;
I915_WRITE(BXT_PORT_PLL(phy, ch, 9), temp);
temp = I915_READ(BXT_PORT_PLL(phy, ch, 10));
temp &= ~PORT_PLL_DCO_AMP_OVR_EN_H;
temp &= ~PORT_PLL_DCO_AMP_MASK;
temp |= pll->state.hw_state.pll10;
I915_WRITE(BXT_PORT_PLL(phy, ch, 10), temp);
/* Recalibrate with new settings */
temp = I915_READ(BXT_PORT_PLL_EBB_4(phy, ch));
temp |= PORT_PLL_RECALIBRATE;
I915_WRITE(BXT_PORT_PLL_EBB_4(phy, ch), temp);
temp &= ~PORT_PLL_10BIT_CLK_ENABLE;
temp |= pll->state.hw_state.ebb4;
I915_WRITE(BXT_PORT_PLL_EBB_4(phy, ch), temp);
/* Enable PLL */
temp = I915_READ(BXT_PORT_PLL_ENABLE(port));
temp |= PORT_PLL_ENABLE;
I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp);
POSTING_READ(BXT_PORT_PLL_ENABLE(port));
if (wait_for_us((I915_READ(BXT_PORT_PLL_ENABLE(port)) & PORT_PLL_LOCK),
200))
DRM_ERROR("PLL %d not locked\n", port);
if (IS_GEMINILAKE(dev_priv)) {
temp = I915_READ(BXT_PORT_TX_DW5_LN0(phy, ch));
temp |= DCC_DELAY_RANGE_2;
I915_WRITE(BXT_PORT_TX_DW5_GRP(phy, ch), temp);
}
/*
* While we write to the group register to program all lanes at once we
* can read only lane registers and we pick lanes 0/1 for that.
*/
temp = I915_READ(BXT_PORT_PCS_DW12_LN01(phy, ch));
temp &= ~LANE_STAGGER_MASK;
temp &= ~LANESTAGGER_STRAP_OVRD;
temp |= pll->state.hw_state.pcsdw12;
I915_WRITE(BXT_PORT_PCS_DW12_GRP(phy, ch), temp);
}
static void bxt_ddi_pll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
enum port port = (enum port)pll->info->id; /* 1:1 port->PLL mapping */
u32 temp;
temp = I915_READ(BXT_PORT_PLL_ENABLE(port));
temp &= ~PORT_PLL_ENABLE;
I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp);
POSTING_READ(BXT_PORT_PLL_ENABLE(port));
if (IS_GEMINILAKE(dev_priv)) {
temp = I915_READ(BXT_PORT_PLL_ENABLE(port));
temp &= ~PORT_PLL_POWER_ENABLE;
I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp);
if (wait_for_us(!(I915_READ(BXT_PORT_PLL_ENABLE(port)) &
PORT_PLL_POWER_STATE), 200))
DRM_ERROR("Power state not reset for PLL:%d\n", port);
}
}
static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
enum port port = (enum port)pll->info->id; /* 1:1 port->PLL mapping */
intel_wakeref_t wakeref;
enum dpio_phy phy;
enum dpio_channel ch;
u32 val;
bool ret;
bxt_port_to_phy_channel(dev_priv, port, &phy, &ch);
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
ret = false;
val = I915_READ(BXT_PORT_PLL_ENABLE(port));
if (!(val & PORT_PLL_ENABLE))
goto out;
hw_state->ebb0 = I915_READ(BXT_PORT_PLL_EBB_0(phy, ch));
hw_state->ebb0 &= PORT_PLL_P1_MASK | PORT_PLL_P2_MASK;
hw_state->ebb4 = I915_READ(BXT_PORT_PLL_EBB_4(phy, ch));
hw_state->ebb4 &= PORT_PLL_10BIT_CLK_ENABLE;
hw_state->pll0 = I915_READ(BXT_PORT_PLL(phy, ch, 0));
hw_state->pll0 &= PORT_PLL_M2_MASK;
hw_state->pll1 = I915_READ(BXT_PORT_PLL(phy, ch, 1));
hw_state->pll1 &= PORT_PLL_N_MASK;
hw_state->pll2 = I915_READ(BXT_PORT_PLL(phy, ch, 2));
hw_state->pll2 &= PORT_PLL_M2_FRAC_MASK;
hw_state->pll3 = I915_READ(BXT_PORT_PLL(phy, ch, 3));
hw_state->pll3 &= PORT_PLL_M2_FRAC_ENABLE;
hw_state->pll6 = I915_READ(BXT_PORT_PLL(phy, ch, 6));
hw_state->pll6 &= PORT_PLL_PROP_COEFF_MASK |
PORT_PLL_INT_COEFF_MASK |
PORT_PLL_GAIN_CTL_MASK;
hw_state->pll8 = I915_READ(BXT_PORT_PLL(phy, ch, 8));
hw_state->pll8 &= PORT_PLL_TARGET_CNT_MASK;
hw_state->pll9 = I915_READ(BXT_PORT_PLL(phy, ch, 9));
hw_state->pll9 &= PORT_PLL_LOCK_THRESHOLD_MASK;
hw_state->pll10 = I915_READ(BXT_PORT_PLL(phy, ch, 10));
hw_state->pll10 &= PORT_PLL_DCO_AMP_OVR_EN_H |
PORT_PLL_DCO_AMP_MASK;
/*
* While we write to the group register to program all lanes at once we
* can read only lane registers. We configure all lanes the same way, so
* here just read out lanes 0/1 and output a note if lanes 2/3 differ.
*/
hw_state->pcsdw12 = I915_READ(BXT_PORT_PCS_DW12_LN01(phy, ch));
if (I915_READ(BXT_PORT_PCS_DW12_LN23(phy, ch)) != hw_state->pcsdw12)
DRM_DEBUG_DRIVER("lane stagger config different for lane 01 (%08x) and 23 (%08x)\n",
hw_state->pcsdw12,
I915_READ(BXT_PORT_PCS_DW12_LN23(phy, ch)));
hw_state->pcsdw12 &= LANE_STAGGER_MASK | LANESTAGGER_STRAP_OVRD;
ret = true;
out:
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return ret;
}
/* bxt clock parameters */
struct bxt_clk_div {
int clock;
u32 p1;
u32 p2;
u32 m2_int;
u32 m2_frac;
bool m2_frac_en;
u32 n;
int vco;
};
/* pre-calculated values for DP linkrates */
static const struct bxt_clk_div bxt_dp_clk_val[] = {
{162000, 4, 2, 32, 1677722, 1, 1},
{270000, 4, 1, 27, 0, 0, 1},
{540000, 2, 1, 27, 0, 0, 1},
{216000, 3, 2, 32, 1677722, 1, 1},
{243000, 4, 1, 24, 1258291, 1, 1},
{324000, 4, 1, 32, 1677722, 1, 1},
{432000, 3, 1, 32, 1677722, 1, 1}
};
static bool
bxt_ddi_hdmi_pll_dividers(struct intel_crtc *intel_crtc,
struct intel_crtc_state *crtc_state, int clock,
struct bxt_clk_div *clk_div)
{
struct dpll best_clock;
/* Calculate HDMI div */
/*
* FIXME: tie the following calculation into
* i9xx_crtc_compute_clock
*/
if (!bxt_find_best_dpll(crtc_state, clock, &best_clock)) {
DRM_DEBUG_DRIVER("no PLL dividers found for clock %d pipe %c\n",
clock, pipe_name(intel_crtc->pipe));
return false;
}
clk_div->p1 = best_clock.p1;
clk_div->p2 = best_clock.p2;
WARN_ON(best_clock.m1 != 2);
clk_div->n = best_clock.n;
clk_div->m2_int = best_clock.m2 >> 22;
clk_div->m2_frac = best_clock.m2 & ((1 << 22) - 1);
clk_div->m2_frac_en = clk_div->m2_frac != 0;
clk_div->vco = best_clock.vco;
return true;
}
static void bxt_ddi_dp_pll_dividers(int clock, struct bxt_clk_div *clk_div)
{
int i;
*clk_div = bxt_dp_clk_val[0];
for (i = 0; i < ARRAY_SIZE(bxt_dp_clk_val); ++i) {
if (bxt_dp_clk_val[i].clock == clock) {
*clk_div = bxt_dp_clk_val[i];
break;
}
}
clk_div->vco = clock * 10 / 2 * clk_div->p1 * clk_div->p2;
}
static bool bxt_ddi_set_dpll_hw_state(int clock,
struct bxt_clk_div *clk_div,
struct intel_dpll_hw_state *dpll_hw_state)
{
int vco = clk_div->vco;
u32 prop_coef, int_coef, gain_ctl, targ_cnt;
u32 lanestagger;
if (vco >= 6200000 && vco <= 6700000) {
prop_coef = 4;
int_coef = 9;
gain_ctl = 3;
targ_cnt = 8;
} else if ((vco > 5400000 && vco < 6200000) ||
(vco >= 4800000 && vco < 5400000)) {
prop_coef = 5;
int_coef = 11;
gain_ctl = 3;
targ_cnt = 9;
} else if (vco == 5400000) {
prop_coef = 3;
int_coef = 8;
gain_ctl = 1;
targ_cnt = 9;
} else {
DRM_ERROR("Invalid VCO\n");
return false;
}
if (clock > 270000)
lanestagger = 0x18;
else if (clock > 135000)
lanestagger = 0x0d;
else if (clock > 67000)
lanestagger = 0x07;
else if (clock > 33000)
lanestagger = 0x04;
else
lanestagger = 0x02;
dpll_hw_state->ebb0 = PORT_PLL_P1(clk_div->p1) | PORT_PLL_P2(clk_div->p2);
dpll_hw_state->pll0 = clk_div->m2_int;
dpll_hw_state->pll1 = PORT_PLL_N(clk_div->n);
dpll_hw_state->pll2 = clk_div->m2_frac;
if (clk_div->m2_frac_en)
dpll_hw_state->pll3 = PORT_PLL_M2_FRAC_ENABLE;
dpll_hw_state->pll6 = prop_coef | PORT_PLL_INT_COEFF(int_coef);
dpll_hw_state->pll6 |= PORT_PLL_GAIN_CTL(gain_ctl);
dpll_hw_state->pll8 = targ_cnt;
dpll_hw_state->pll9 = 5 << PORT_PLL_LOCK_THRESHOLD_SHIFT;
dpll_hw_state->pll10 =
PORT_PLL_DCO_AMP(PORT_PLL_DCO_AMP_DEFAULT)
| PORT_PLL_DCO_AMP_OVR_EN_H;
dpll_hw_state->ebb4 = PORT_PLL_10BIT_CLK_ENABLE;
dpll_hw_state->pcsdw12 = LANESTAGGER_STRAP_OVRD | lanestagger;
return true;
}
static bool
bxt_ddi_dp_set_dpll_hw_state(int clock,
struct intel_dpll_hw_state *dpll_hw_state)
{
struct bxt_clk_div clk_div = {0};
bxt_ddi_dp_pll_dividers(clock, &clk_div);
return bxt_ddi_set_dpll_hw_state(clock, &clk_div, dpll_hw_state);
}
static bool
bxt_ddi_hdmi_set_dpll_hw_state(struct intel_crtc *intel_crtc,
struct intel_crtc_state *crtc_state, int clock,
struct intel_dpll_hw_state *dpll_hw_state)
{
struct bxt_clk_div clk_div = { };
bxt_ddi_hdmi_pll_dividers(intel_crtc, crtc_state, clock, &clk_div);
return bxt_ddi_set_dpll_hw_state(clock, &clk_div, dpll_hw_state);
}
static struct intel_shared_dpll *
bxt_get_dpll(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct intel_dpll_hw_state dpll_hw_state = { };
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_shared_dpll *pll;
int i, clock = crtc_state->port_clock;
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) &&
!bxt_ddi_hdmi_set_dpll_hw_state(crtc, crtc_state, clock,
&dpll_hw_state))
return NULL;
if (intel_crtc_has_dp_encoder(crtc_state) &&
!bxt_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state))
return NULL;
memset(&crtc_state->dpll_hw_state, 0,
sizeof(crtc_state->dpll_hw_state));
crtc_state->dpll_hw_state = dpll_hw_state;
/* 1:1 mapping between ports and PLLs */
i = (enum intel_dpll_id) encoder->port;
pll = intel_get_shared_dpll_by_id(dev_priv, i);
DRM_DEBUG_KMS("[CRTC:%d:%s] using pre-allocated %s\n",
crtc->base.base.id, crtc->base.name, pll->info->name);
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static void bxt_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: ebb0: 0x%x, ebb4: 0x%x,"
"pll0: 0x%x, pll1: 0x%x, pll2: 0x%x, pll3: 0x%x, "
"pll6: 0x%x, pll8: 0x%x, pll9: 0x%x, pll10: 0x%x, pcsdw12: 0x%x\n",
hw_state->ebb0,
hw_state->ebb4,
hw_state->pll0,
hw_state->pll1,
hw_state->pll2,
hw_state->pll3,
hw_state->pll6,
hw_state->pll8,
hw_state->pll9,
hw_state->pll10,
hw_state->pcsdw12);
}
static const struct intel_shared_dpll_funcs bxt_ddi_pll_funcs = {
.enable = bxt_ddi_pll_enable,
.disable = bxt_ddi_pll_disable,
.get_hw_state = bxt_ddi_pll_get_hw_state,
};
static void intel_ddi_pll_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
if (INTEL_GEN(dev_priv) < 9) {
u32 val = I915_READ(LCPLL_CTL);
/*
* The LCPLL register should be turned on by the BIOS. For now
* let's just check its state and print errors in case
* something is wrong. Don't even try to turn it on.
*/
if (val & LCPLL_CD_SOURCE_FCLK)
DRM_ERROR("CDCLK source is not LCPLL\n");
if (val & LCPLL_PLL_DISABLE)
DRM_ERROR("LCPLL is disabled\n");
}
}
struct intel_dpll_mgr {
const struct dpll_info *dpll_info;
struct intel_shared_dpll *(*get_dpll)(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder);
void (*dump_hw_state)(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state);
};
static const struct dpll_info pch_plls[] = {
{ "PCH DPLL A", &ibx_pch_dpll_funcs, DPLL_ID_PCH_PLL_A, 0 },
{ "PCH DPLL B", &ibx_pch_dpll_funcs, DPLL_ID_PCH_PLL_B, 0 },
{ },
};
static const struct intel_dpll_mgr pch_pll_mgr = {
.dpll_info = pch_plls,
.get_dpll = ibx_get_dpll,
.dump_hw_state = ibx_dump_hw_state,
};
static const struct dpll_info hsw_plls[] = {
{ "WRPLL 1", &hsw_ddi_wrpll_funcs, DPLL_ID_WRPLL1, 0 },
{ "WRPLL 2", &hsw_ddi_wrpll_funcs, DPLL_ID_WRPLL2, 0 },
{ "SPLL", &hsw_ddi_spll_funcs, DPLL_ID_SPLL, 0 },
{ "LCPLL 810", &hsw_ddi_lcpll_funcs, DPLL_ID_LCPLL_810, INTEL_DPLL_ALWAYS_ON },
{ "LCPLL 1350", &hsw_ddi_lcpll_funcs, DPLL_ID_LCPLL_1350, INTEL_DPLL_ALWAYS_ON },
{ "LCPLL 2700", &hsw_ddi_lcpll_funcs, DPLL_ID_LCPLL_2700, INTEL_DPLL_ALWAYS_ON },
{ },
};
static const struct intel_dpll_mgr hsw_pll_mgr = {
.dpll_info = hsw_plls,
.get_dpll = hsw_get_dpll,
.dump_hw_state = hsw_dump_hw_state,
};
static const struct dpll_info skl_plls[] = {
{ "DPLL 0", &skl_ddi_dpll0_funcs, DPLL_ID_SKL_DPLL0, INTEL_DPLL_ALWAYS_ON },
{ "DPLL 1", &skl_ddi_pll_funcs, DPLL_ID_SKL_DPLL1, 0 },
{ "DPLL 2", &skl_ddi_pll_funcs, DPLL_ID_SKL_DPLL2, 0 },
{ "DPLL 3", &skl_ddi_pll_funcs, DPLL_ID_SKL_DPLL3, 0 },
{ },
};
static const struct intel_dpll_mgr skl_pll_mgr = {
.dpll_info = skl_plls,
.get_dpll = skl_get_dpll,
.dump_hw_state = skl_dump_hw_state,
};
static const struct dpll_info bxt_plls[] = {
{ "PORT PLL A", &bxt_ddi_pll_funcs, DPLL_ID_SKL_DPLL0, 0 },
{ "PORT PLL B", &bxt_ddi_pll_funcs, DPLL_ID_SKL_DPLL1, 0 },
{ "PORT PLL C", &bxt_ddi_pll_funcs, DPLL_ID_SKL_DPLL2, 0 },
{ },
};
static const struct intel_dpll_mgr bxt_pll_mgr = {
.dpll_info = bxt_plls,
.get_dpll = bxt_get_dpll,
.dump_hw_state = bxt_dump_hw_state,
};
static void cnl_ddi_pll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
u32 val;
/* 1. Enable DPLL power in DPLL_ENABLE. */
val = I915_READ(CNL_DPLL_ENABLE(id));
val |= PLL_POWER_ENABLE;
I915_WRITE(CNL_DPLL_ENABLE(id), val);
/* 2. Wait for DPLL power state enabled in DPLL_ENABLE. */
if (intel_wait_for_register(dev_priv,
CNL_DPLL_ENABLE(id),
PLL_POWER_STATE,
PLL_POWER_STATE,
5))
DRM_ERROR("PLL %d Power not enabled\n", id);
/*
* 3. Configure DPLL_CFGCR0 to set SSC enable/disable,
* select DP mode, and set DP link rate.
*/
val = pll->state.hw_state.cfgcr0;
I915_WRITE(CNL_DPLL_CFGCR0(id), val);
/* 4. Reab back to ensure writes completed */
POSTING_READ(CNL_DPLL_CFGCR0(id));
/* 3. Configure DPLL_CFGCR0 */
/* Avoid touch CFGCR1 if HDMI mode is not enabled */
if (pll->state.hw_state.cfgcr0 & DPLL_CFGCR0_HDMI_MODE) {
val = pll->state.hw_state.cfgcr1;
I915_WRITE(CNL_DPLL_CFGCR1(id), val);
/* 4. Reab back to ensure writes completed */
POSTING_READ(CNL_DPLL_CFGCR1(id));
}
/*
* 5. If the frequency will result in a change to the voltage
* requirement, follow the Display Voltage Frequency Switching
* Sequence Before Frequency Change
*
* Note: DVFS is actually handled via the cdclk code paths,
* hence we do nothing here.
*/
/* 6. Enable DPLL in DPLL_ENABLE. */
val = I915_READ(CNL_DPLL_ENABLE(id));
val |= PLL_ENABLE;
I915_WRITE(CNL_DPLL_ENABLE(id), val);
/* 7. Wait for PLL lock status in DPLL_ENABLE. */
if (intel_wait_for_register(dev_priv,
CNL_DPLL_ENABLE(id),
PLL_LOCK,
PLL_LOCK,
5))
DRM_ERROR("PLL %d not locked\n", id);
/*
* 8. If the frequency will result in a change to the voltage
* requirement, follow the Display Voltage Frequency Switching
* Sequence After Frequency Change
*
* Note: DVFS is actually handled via the cdclk code paths,
* hence we do nothing here.
*/
/*
* 9. turn on the clock for the DDI and map the DPLL to the DDI
* Done at intel_ddi_clk_select
*/
}
static void cnl_ddi_pll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
u32 val;
/*
* 1. Configure DPCLKA_CFGCR0 to turn off the clock for the DDI.
* Done at intel_ddi_post_disable
*/
/*
* 2. If the frequency will result in a change to the voltage
* requirement, follow the Display Voltage Frequency Switching
* Sequence Before Frequency Change
*
* Note: DVFS is actually handled via the cdclk code paths,
* hence we do nothing here.
*/
/* 3. Disable DPLL through DPLL_ENABLE. */
val = I915_READ(CNL_DPLL_ENABLE(id));
val &= ~PLL_ENABLE;
I915_WRITE(CNL_DPLL_ENABLE(id), val);
/* 4. Wait for PLL not locked status in DPLL_ENABLE. */
if (intel_wait_for_register(dev_priv,
CNL_DPLL_ENABLE(id),
PLL_LOCK,
0,
5))
DRM_ERROR("PLL %d locked\n", id);
/*
* 5. If the frequency will result in a change to the voltage
* requirement, follow the Display Voltage Frequency Switching
* Sequence After Frequency Change
*
* Note: DVFS is actually handled via the cdclk code paths,
* hence we do nothing here.
*/
/* 6. Disable DPLL power in DPLL_ENABLE. */
val = I915_READ(CNL_DPLL_ENABLE(id));
val &= ~PLL_POWER_ENABLE;
I915_WRITE(CNL_DPLL_ENABLE(id), val);
/* 7. Wait for DPLL power state disabled in DPLL_ENABLE. */
if (intel_wait_for_register(dev_priv,
CNL_DPLL_ENABLE(id),
PLL_POWER_STATE,
0,
5))
DRM_ERROR("PLL %d Power not disabled\n", id);
}
static bool cnl_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
u32 val;
bool ret;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
ret = false;
val = I915_READ(CNL_DPLL_ENABLE(id));
if (!(val & PLL_ENABLE))
goto out;
val = I915_READ(CNL_DPLL_CFGCR0(id));
hw_state->cfgcr0 = val;
/* avoid reading back stale values if HDMI mode is not enabled */
if (val & DPLL_CFGCR0_HDMI_MODE) {
hw_state->cfgcr1 = I915_READ(CNL_DPLL_CFGCR1(id));
}
ret = true;
out:
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return ret;
}
static void cnl_wrpll_get_multipliers(int bestdiv, int *pdiv,
int *qdiv, int *kdiv)
{
/* even dividers */
if (bestdiv % 2 == 0) {
if (bestdiv == 2) {
*pdiv = 2;
*qdiv = 1;
*kdiv = 1;
} else if (bestdiv % 4 == 0) {
*pdiv = 2;
*qdiv = bestdiv / 4;
*kdiv = 2;
} else if (bestdiv % 6 == 0) {
*pdiv = 3;
*qdiv = bestdiv / 6;
*kdiv = 2;
} else if (bestdiv % 5 == 0) {
*pdiv = 5;
*qdiv = bestdiv / 10;
*kdiv = 2;
} else if (bestdiv % 14 == 0) {
*pdiv = 7;
*qdiv = bestdiv / 14;
*kdiv = 2;
}
} else {
if (bestdiv == 3 || bestdiv == 5 || bestdiv == 7) {
*pdiv = bestdiv;
*qdiv = 1;
*kdiv = 1;
} else { /* 9, 15, 21 */
*pdiv = bestdiv / 3;
*qdiv = 1;
*kdiv = 3;
}
}
}
static void cnl_wrpll_params_populate(struct skl_wrpll_params *params,
u32 dco_freq, u32 ref_freq,
int pdiv, int qdiv, int kdiv)
{
u32 dco;
switch (kdiv) {
case 1:
params->kdiv = 1;
break;
case 2:
params->kdiv = 2;
break;
case 3:
params->kdiv = 4;
break;
default:
WARN(1, "Incorrect KDiv\n");
}
switch (pdiv) {
case 2:
params->pdiv = 1;
break;
case 3:
params->pdiv = 2;
break;
case 5:
params->pdiv = 4;
break;
case 7:
params->pdiv = 8;
break;
default:
WARN(1, "Incorrect PDiv\n");
}
WARN_ON(kdiv != 2 && qdiv != 1);
params->qdiv_ratio = qdiv;
params->qdiv_mode = (qdiv == 1) ? 0 : 1;
dco = div_u64((u64)dco_freq << 15, ref_freq);
params->dco_integer = dco >> 15;
params->dco_fraction = dco & 0x7fff;
}
int cnl_hdmi_pll_ref_clock(struct drm_i915_private *dev_priv)
{
int ref_clock = dev_priv->cdclk.hw.ref;
/*
* For ICL+, the spec states: if reference frequency is 38.4,
* use 19.2 because the DPLL automatically divides that by 2.
*/
if (INTEL_GEN(dev_priv) >= 11 && ref_clock == 38400)
ref_clock = 19200;
return ref_clock;
}
static bool
cnl_ddi_calculate_wrpll(int clock,
struct drm_i915_private *dev_priv,
struct skl_wrpll_params *wrpll_params)
{
u32 afe_clock = clock * 5;
u32 ref_clock;
u32 dco_min = 7998000;
u32 dco_max = 10000000;
u32 dco_mid = (dco_min + dco_max) / 2;
static const int dividers[] = { 2, 4, 6, 8, 10, 12, 14, 16,
18, 20, 24, 28, 30, 32, 36, 40,
42, 44, 48, 50, 52, 54, 56, 60,
64, 66, 68, 70, 72, 76, 78, 80,
84, 88, 90, 92, 96, 98, 100, 102,
3, 5, 7, 9, 15, 21 };
u32 dco, best_dco = 0, dco_centrality = 0;
u32 best_dco_centrality = U32_MAX; /* Spec meaning of 999999 MHz */
int d, best_div = 0, pdiv = 0, qdiv = 0, kdiv = 0;
for (d = 0; d < ARRAY_SIZE(dividers); d++) {
dco = afe_clock * dividers[d];
if ((dco <= dco_max) && (dco >= dco_min)) {
dco_centrality = abs(dco - dco_mid);
if (dco_centrality < best_dco_centrality) {
best_dco_centrality = dco_centrality;
best_div = dividers[d];
best_dco = dco;
}
}
}
if (best_div == 0)
return false;
cnl_wrpll_get_multipliers(best_div, &pdiv, &qdiv, &kdiv);
ref_clock = cnl_hdmi_pll_ref_clock(dev_priv);
cnl_wrpll_params_populate(wrpll_params, best_dco, ref_clock, pdiv, qdiv,
kdiv);
return true;
}
static bool cnl_ddi_hdmi_pll_dividers(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
int clock)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
u32 cfgcr0, cfgcr1;
struct skl_wrpll_params wrpll_params = { 0, };
cfgcr0 = DPLL_CFGCR0_HDMI_MODE;
if (!cnl_ddi_calculate_wrpll(clock, dev_priv, &wrpll_params))
return false;
cfgcr0 |= DPLL_CFGCR0_DCO_FRACTION(wrpll_params.dco_fraction) |
wrpll_params.dco_integer;
cfgcr1 = DPLL_CFGCR1_QDIV_RATIO(wrpll_params.qdiv_ratio) |
DPLL_CFGCR1_QDIV_MODE(wrpll_params.qdiv_mode) |
DPLL_CFGCR1_KDIV(wrpll_params.kdiv) |
DPLL_CFGCR1_PDIV(wrpll_params.pdiv) |
DPLL_CFGCR1_CENTRAL_FREQ;
memset(&crtc_state->dpll_hw_state, 0,
sizeof(crtc_state->dpll_hw_state));
crtc_state->dpll_hw_state.cfgcr0 = cfgcr0;
crtc_state->dpll_hw_state.cfgcr1 = cfgcr1;
return true;
}
static bool
cnl_ddi_dp_set_dpll_hw_state(int clock,
struct intel_dpll_hw_state *dpll_hw_state)
{
u32 cfgcr0;
cfgcr0 = DPLL_CFGCR0_SSC_ENABLE;
switch (clock / 2) {
case 81000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_810;
break;
case 135000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_1350;
break;
case 270000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_2700;
break;
/* eDP 1.4 rates */
case 162000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_1620;
break;
case 108000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_1080;
break;
case 216000:
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_2160;
break;
case 324000:
/* Some SKUs may require elevated I/O voltage to support this */
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_3240;
break;
case 405000:
/* Some SKUs may require elevated I/O voltage to support this */
cfgcr0 |= DPLL_CFGCR0_LINK_RATE_4050;
break;
}
dpll_hw_state->cfgcr0 = cfgcr0;
return true;
}
static struct intel_shared_dpll *
cnl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct intel_shared_dpll *pll;
int clock = crtc_state->port_clock;
bool bret;
struct intel_dpll_hw_state dpll_hw_state;
memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
bret = cnl_ddi_hdmi_pll_dividers(crtc, crtc_state, clock);
if (!bret) {
DRM_DEBUG_KMS("Could not get HDMI pll dividers.\n");
return NULL;
}
} else if (intel_crtc_has_dp_encoder(crtc_state)) {
bret = cnl_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state);
if (!bret) {
DRM_DEBUG_KMS("Could not set DP dpll HW state.\n");
return NULL;
}
crtc_state->dpll_hw_state = dpll_hw_state;
} else {
DRM_DEBUG_KMS("Skip DPLL setup for output_types 0x%x\n",
crtc_state->output_types);
return NULL;
}
pll = intel_find_shared_dpll(crtc, crtc_state,
DPLL_ID_SKL_DPLL0,
DPLL_ID_SKL_DPLL2);
if (!pll) {
DRM_DEBUG_KMS("No PLL selected\n");
return NULL;
}
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static void cnl_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: "
"cfgcr0: 0x%x, cfgcr1: 0x%x\n",
hw_state->cfgcr0,
hw_state->cfgcr1);
}
static const struct intel_shared_dpll_funcs cnl_ddi_pll_funcs = {
.enable = cnl_ddi_pll_enable,
.disable = cnl_ddi_pll_disable,
.get_hw_state = cnl_ddi_pll_get_hw_state,
};
static const struct dpll_info cnl_plls[] = {
{ "DPLL 0", &cnl_ddi_pll_funcs, DPLL_ID_SKL_DPLL0, 0 },
{ "DPLL 1", &cnl_ddi_pll_funcs, DPLL_ID_SKL_DPLL1, 0 },
{ "DPLL 2", &cnl_ddi_pll_funcs, DPLL_ID_SKL_DPLL2, 0 },
{ },
};
static const struct intel_dpll_mgr cnl_pll_mgr = {
.dpll_info = cnl_plls,
.get_dpll = cnl_get_dpll,
.dump_hw_state = cnl_dump_hw_state,
};
/*
* These values alrea already adjusted: they're the bits we write to the
* registers, not the logical values.
*/
static const struct skl_wrpll_params icl_dp_combo_pll_24MHz_values[] = {
{ .dco_integer = 0x151, .dco_fraction = 0x4000, /* [0]: 5.4 */
.pdiv = 0x2 /* 3 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x151, .dco_fraction = 0x4000, /* [1]: 2.7 */
.pdiv = 0x2 /* 3 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x151, .dco_fraction = 0x4000, /* [2]: 1.62 */
.pdiv = 0x4 /* 5 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x151, .dco_fraction = 0x4000, /* [3]: 3.24 */
.pdiv = 0x4 /* 5 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x168, .dco_fraction = 0x0000, /* [4]: 2.16 */
.pdiv = 0x1 /* 2 */, .kdiv = 2, .qdiv_mode = 1, .qdiv_ratio = 2},
{ .dco_integer = 0x168, .dco_fraction = 0x0000, /* [5]: 4.32 */
.pdiv = 0x1 /* 2 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x195, .dco_fraction = 0x0000, /* [6]: 6.48 */
.pdiv = 0x2 /* 3 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x151, .dco_fraction = 0x4000, /* [7]: 8.1 */
.pdiv = 0x1 /* 2 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
};
/* Also used for 38.4 MHz values. */
static const struct skl_wrpll_params icl_dp_combo_pll_19_2MHz_values[] = {
{ .dco_integer = 0x1A5, .dco_fraction = 0x7000, /* [0]: 5.4 */
.pdiv = 0x2 /* 3 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1A5, .dco_fraction = 0x7000, /* [1]: 2.7 */
.pdiv = 0x2 /* 3 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1A5, .dco_fraction = 0x7000, /* [2]: 1.62 */
.pdiv = 0x4 /* 5 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1A5, .dco_fraction = 0x7000, /* [3]: 3.24 */
.pdiv = 0x4 /* 5 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1C2, .dco_fraction = 0x0000, /* [4]: 2.16 */
.pdiv = 0x1 /* 2 */, .kdiv = 2, .qdiv_mode = 1, .qdiv_ratio = 2},
{ .dco_integer = 0x1C2, .dco_fraction = 0x0000, /* [5]: 4.32 */
.pdiv = 0x1 /* 2 */, .kdiv = 2, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1FA, .dco_fraction = 0x2000, /* [6]: 6.48 */
.pdiv = 0x2 /* 3 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
{ .dco_integer = 0x1A5, .dco_fraction = 0x7000, /* [7]: 8.1 */
.pdiv = 0x1 /* 2 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0},
};
static const struct skl_wrpll_params icl_tbt_pll_24MHz_values = {
.dco_integer = 0x151, .dco_fraction = 0x4000,
.pdiv = 0x4 /* 5 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0,
};
static const struct skl_wrpll_params icl_tbt_pll_19_2MHz_values = {
.dco_integer = 0x1A5, .dco_fraction = 0x7000,
.pdiv = 0x4 /* 5 */, .kdiv = 1, .qdiv_mode = 0, .qdiv_ratio = 0,
};
static bool icl_calc_dp_combo_pll(struct drm_i915_private *dev_priv, int clock,
struct skl_wrpll_params *pll_params)
{
const struct skl_wrpll_params *params;
params = dev_priv->cdclk.hw.ref == 24000 ?
icl_dp_combo_pll_24MHz_values :
icl_dp_combo_pll_19_2MHz_values;
switch (clock) {
case 540000:
*pll_params = params[0];
break;
case 270000:
*pll_params = params[1];
break;
case 162000:
*pll_params = params[2];
break;
case 324000:
*pll_params = params[3];
break;
case 216000:
*pll_params = params[4];
break;
case 432000:
*pll_params = params[5];
break;
case 648000:
*pll_params = params[6];
break;
case 810000:
*pll_params = params[7];
break;
default:
MISSING_CASE(clock);
return false;
}
return true;
}
static bool icl_calc_tbt_pll(struct drm_i915_private *dev_priv, int clock,
struct skl_wrpll_params *pll_params)
{
*pll_params = dev_priv->cdclk.hw.ref == 24000 ?
icl_tbt_pll_24MHz_values : icl_tbt_pll_19_2MHz_values;
return true;
}
static bool icl_calc_dpll_state(struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder, int clock,
struct intel_dpll_hw_state *pll_state)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
u32 cfgcr0, cfgcr1;
struct skl_wrpll_params pll_params = { 0 };
bool ret;
if (intel_port_is_tc(dev_priv, encoder->port))
ret = icl_calc_tbt_pll(dev_priv, clock, &pll_params);
else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) ||
intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
ret = cnl_ddi_calculate_wrpll(clock, dev_priv, &pll_params);
else
ret = icl_calc_dp_combo_pll(dev_priv, clock, &pll_params);
if (!ret)
return false;
cfgcr0 = DPLL_CFGCR0_DCO_FRACTION(pll_params.dco_fraction) |
pll_params.dco_integer;
cfgcr1 = DPLL_CFGCR1_QDIV_RATIO(pll_params.qdiv_ratio) |
DPLL_CFGCR1_QDIV_MODE(pll_params.qdiv_mode) |
DPLL_CFGCR1_KDIV(pll_params.kdiv) |
DPLL_CFGCR1_PDIV(pll_params.pdiv) |
DPLL_CFGCR1_CENTRAL_FREQ_8400;
pll_state->cfgcr0 = cfgcr0;
pll_state->cfgcr1 = cfgcr1;
return true;
}
int icl_calc_dp_combo_pll_link(struct drm_i915_private *dev_priv,
u32 pll_id)
{
u32 cfgcr0, cfgcr1;
u32 pdiv, kdiv, qdiv_mode, qdiv_ratio, dco_integer, dco_fraction;
const struct skl_wrpll_params *params;
int index, n_entries, link_clock;
/* Read back values from DPLL CFGCR registers */
cfgcr0 = I915_READ(ICL_DPLL_CFGCR0(pll_id));
cfgcr1 = I915_READ(ICL_DPLL_CFGCR1(pll_id));
dco_integer = cfgcr0 & DPLL_CFGCR0_DCO_INTEGER_MASK;
dco_fraction = (cfgcr0 & DPLL_CFGCR0_DCO_FRACTION_MASK) >>
DPLL_CFGCR0_DCO_FRACTION_SHIFT;
pdiv = (cfgcr1 & DPLL_CFGCR1_PDIV_MASK) >> DPLL_CFGCR1_PDIV_SHIFT;
kdiv = (cfgcr1 & DPLL_CFGCR1_KDIV_MASK) >> DPLL_CFGCR1_KDIV_SHIFT;
qdiv_mode = (cfgcr1 & DPLL_CFGCR1_QDIV_MODE(1)) >>
DPLL_CFGCR1_QDIV_MODE_SHIFT;
qdiv_ratio = (cfgcr1 & DPLL_CFGCR1_QDIV_RATIO_MASK) >>
DPLL_CFGCR1_QDIV_RATIO_SHIFT;
params = dev_priv->cdclk.hw.ref == 24000 ?
icl_dp_combo_pll_24MHz_values :
icl_dp_combo_pll_19_2MHz_values;
n_entries = ARRAY_SIZE(icl_dp_combo_pll_24MHz_values);
for (index = 0; index < n_entries; index++) {
if (dco_integer == params[index].dco_integer &&
dco_fraction == params[index].dco_fraction &&
pdiv == params[index].pdiv &&
kdiv == params[index].kdiv &&
qdiv_mode == params[index].qdiv_mode &&
qdiv_ratio == params[index].qdiv_ratio)
break;
}
/* Map PLL Index to Link Clock */
switch (index) {
default:
MISSING_CASE(index);
/* fall through */
case 0:
link_clock = 540000;
break;
case 1:
link_clock = 270000;
break;
case 2:
link_clock = 162000;
break;
case 3:
link_clock = 324000;
break;
case 4:
link_clock = 216000;
break;
case 5:
link_clock = 432000;
break;
case 6:
link_clock = 648000;
break;
case 7:
link_clock = 810000;
break;
}
return link_clock;
}
static enum tc_port icl_pll_id_to_tc_port(enum intel_dpll_id id)
{
return id - DPLL_ID_ICL_MGPLL1;
}
enum intel_dpll_id icl_tc_port_to_pll_id(enum tc_port tc_port)
{
return tc_port + DPLL_ID_ICL_MGPLL1;
}
bool intel_dpll_is_combophy(enum intel_dpll_id id)
{
return id == DPLL_ID_ICL_DPLL0 || id == DPLL_ID_ICL_DPLL1;
}
static bool icl_mg_pll_find_divisors(int clock_khz, bool is_dp, bool use_ssc,
u32 *target_dco_khz,
struct intel_dpll_hw_state *state)
{
u32 dco_min_freq, dco_max_freq;
int div1_vals[] = {7, 5, 3, 2};
unsigned int i;
int div2;
dco_min_freq = is_dp ? 8100000 : use_ssc ? 8000000 : 7992000;
dco_max_freq = is_dp ? 8100000 : 10000000;
for (i = 0; i < ARRAY_SIZE(div1_vals); i++) {
int div1 = div1_vals[i];
for (div2 = 10; div2 > 0; div2--) {
int dco = div1 * div2 * clock_khz * 5;
int a_divratio, tlinedrv, inputsel;
u32 hsdiv;
if (dco < dco_min_freq || dco > dco_max_freq)
continue;
if (div2 >= 2) {
a_divratio = is_dp ? 10 : 5;
tlinedrv = 2;
} else {
a_divratio = 5;
tlinedrv = 0;
}
inputsel = is_dp ? 0 : 1;
switch (div1) {
default:
MISSING_CASE(div1);
/* fall through */
case 2:
hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_2;
break;
case 3:
hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_3;
break;
case 5:
hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_5;
break;
case 7:
hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_7;
break;
}
*target_dco_khz = dco;
state->mg_refclkin_ctl = MG_REFCLKIN_CTL_OD_2_MUX(1);
state->mg_clktop2_coreclkctl1 =
MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO(a_divratio);
state->mg_clktop2_hsclkctl =
MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL(tlinedrv) |
MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL(inputsel) |
hsdiv |
MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO(div2);
return true;
}
}
return false;
}
/*
* The specification for this function uses real numbers, so the math had to be
* adapted to integer-only calculation, that's why it looks so different.
*/
static bool icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder, int clock,
struct intel_dpll_hw_state *pll_state)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
int refclk_khz = dev_priv->cdclk.hw.ref;
u32 dco_khz, m1div, m2div_int, m2div_rem, m2div_frac;
u32 iref_ndiv, iref_trim, iref_pulse_w;
u32 prop_coeff, int_coeff;
u32 tdc_targetcnt, feedfwgain;
u64 ssc_stepsize, ssc_steplen, ssc_steplog;
u64 tmp;
bool use_ssc = false;
bool is_dp = !intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI);
if (!icl_mg_pll_find_divisors(clock, is_dp, use_ssc, &dco_khz,
pll_state)) {
DRM_DEBUG_KMS("Failed to find divisors for clock %d\n", clock);
return false;
}
m1div = 2;
m2div_int = dco_khz / (refclk_khz * m1div);
if (m2div_int > 255) {
m1div = 4;
m2div_int = dco_khz / (refclk_khz * m1div);
if (m2div_int > 255) {
DRM_DEBUG_KMS("Failed to find mdiv for clock %d\n",
clock);
return false;
}
}
m2div_rem = dco_khz % (refclk_khz * m1div);
tmp = (u64)m2div_rem * (1 << 22);
do_div(tmp, refclk_khz * m1div);
m2div_frac = tmp;
switch (refclk_khz) {
case 19200:
iref_ndiv = 1;
iref_trim = 28;
iref_pulse_w = 1;
break;
case 24000:
iref_ndiv = 1;
iref_trim = 25;
iref_pulse_w = 2;
break;
case 38400:
iref_ndiv = 2;
iref_trim = 28;
iref_pulse_w = 1;
break;
default:
MISSING_CASE(refclk_khz);
return false;
}
/*
* tdc_res = 0.000003
* tdc_targetcnt = int(2 / (tdc_res * 8 * 50 * 1.1) / refclk_mhz + 0.5)
*
* The multiplication by 1000 is due to refclk MHz to KHz conversion. It
* was supposed to be a division, but we rearranged the operations of
* the formula to avoid early divisions so we don't multiply the
* rounding errors.
*
* 0.000003 * 8 * 50 * 1.1 = 0.00132, also known as 132 / 100000, which
* we also rearrange to work with integers.
*
* The 0.5 transformed to 5 results in a multiplication by 10 and the
* last division by 10.
*/
tdc_targetcnt = (2 * 1000 * 100000 * 10 / (132 * refclk_khz) + 5) / 10;
/*
* Here we divide dco_khz by 10 in order to allow the dividend to fit in
* 32 bits. That's not a problem since we round the division down
* anyway.
*/
feedfwgain = (use_ssc || m2div_rem > 0) ?
m1div * 1000000 * 100 / (dco_khz * 3 / 10) : 0;
if (dco_khz >= 9000000) {
prop_coeff = 5;
int_coeff = 10;
} else {
prop_coeff = 4;
int_coeff = 8;
}
if (use_ssc) {
tmp = (u64)dco_khz * 47 * 32;
do_div(tmp, refclk_khz * m1div * 10000);
ssc_stepsize = tmp;
tmp = (u64)dco_khz * 1000;
ssc_steplen = DIV_ROUND_UP_ULL(tmp, 32 * 2 * 32);
} else {
ssc_stepsize = 0;
ssc_steplen = 0;
}
ssc_steplog = 4;
pll_state->mg_pll_div0 = (m2div_rem > 0 ? MG_PLL_DIV0_FRACNEN_H : 0) |
MG_PLL_DIV0_FBDIV_FRAC(m2div_frac) |
MG_PLL_DIV0_FBDIV_INT(m2div_int);
pll_state->mg_pll_div1 = MG_PLL_DIV1_IREF_NDIVRATIO(iref_ndiv) |
MG_PLL_DIV1_DITHER_DIV_2 |
MG_PLL_DIV1_NDIVRATIO(1) |
MG_PLL_DIV1_FBPREDIV(m1div);
pll_state->mg_pll_lf = MG_PLL_LF_TDCTARGETCNT(tdc_targetcnt) |
MG_PLL_LF_AFCCNTSEL_512 |
MG_PLL_LF_GAINCTRL(1) |
MG_PLL_LF_INT_COEFF(int_coeff) |
MG_PLL_LF_PROP_COEFF(prop_coeff);
pll_state->mg_pll_frac_lock = MG_PLL_FRAC_LOCK_TRUELOCK_CRIT_32 |
MG_PLL_FRAC_LOCK_EARLYLOCK_CRIT_32 |
MG_PLL_FRAC_LOCK_LOCKTHRESH(10) |
MG_PLL_FRAC_LOCK_DCODITHEREN |
MG_PLL_FRAC_LOCK_FEEDFWRDGAIN(feedfwgain);
if (use_ssc || m2div_rem > 0)
pll_state->mg_pll_frac_lock |= MG_PLL_FRAC_LOCK_FEEDFWRDCAL_EN;
pll_state->mg_pll_ssc = (use_ssc ? MG_PLL_SSC_EN : 0) |
MG_PLL_SSC_TYPE(2) |
MG_PLL_SSC_STEPLENGTH(ssc_steplen) |
MG_PLL_SSC_STEPNUM(ssc_steplog) |
MG_PLL_SSC_FLLEN |
MG_PLL_SSC_STEPSIZE(ssc_stepsize);
pll_state->mg_pll_tdc_coldst_bias = MG_PLL_TDC_COLDST_COLDSTART |
MG_PLL_TDC_COLDST_IREFINT_EN |
MG_PLL_TDC_COLDST_REFBIAS_START_PULSE_W(iref_pulse_w) |
MG_PLL_TDC_TDCOVCCORR_EN |
MG_PLL_TDC_TDCSEL(3);
pll_state->mg_pll_bias = MG_PLL_BIAS_BIAS_GB_SEL(3) |
MG_PLL_BIAS_INIT_DCOAMP(0x3F) |
MG_PLL_BIAS_BIAS_BONUS(10) |
MG_PLL_BIAS_BIASCAL_EN |
MG_PLL_BIAS_CTRIM(12) |
MG_PLL_BIAS_VREF_RDAC(4) |
MG_PLL_BIAS_IREFTRIM(iref_trim);
if (refclk_khz == 38400) {
pll_state->mg_pll_tdc_coldst_bias_mask = MG_PLL_TDC_COLDST_COLDSTART;
pll_state->mg_pll_bias_mask = 0;
} else {
pll_state->mg_pll_tdc_coldst_bias_mask = -1U;
pll_state->mg_pll_bias_mask = -1U;
}
pll_state->mg_pll_tdc_coldst_bias &= pll_state->mg_pll_tdc_coldst_bias_mask;
pll_state->mg_pll_bias &= pll_state->mg_pll_bias_mask;
return true;
}
static struct intel_shared_dpll *
icl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_digital_port *intel_dig_port;
struct intel_shared_dpll *pll;
struct intel_dpll_hw_state pll_state = {};
enum port port = encoder->port;
enum intel_dpll_id min, max;
int clock = crtc_state->port_clock;
bool ret;
if (intel_port_is_combophy(dev_priv, port)) {
min = DPLL_ID_ICL_DPLL0;
max = DPLL_ID_ICL_DPLL1;
ret = icl_calc_dpll_state(crtc_state, encoder, clock,
&pll_state);
} else if (intel_port_is_tc(dev_priv, port)) {
if (encoder->type == INTEL_OUTPUT_DP_MST) {
struct intel_dp_mst_encoder *mst_encoder;
mst_encoder = enc_to_mst(&encoder->base);
intel_dig_port = mst_encoder->primary;
} else {
intel_dig_port = enc_to_dig_port(&encoder->base);
}
if (intel_dig_port->tc_type == TC_PORT_TBT) {
min = DPLL_ID_ICL_TBTPLL;
max = min;
ret = icl_calc_dpll_state(crtc_state, encoder, clock,
&pll_state);
} else {
enum tc_port tc_port;
tc_port = intel_port_to_tc(dev_priv, port);
min = icl_tc_port_to_pll_id(tc_port);
max = min;
ret = icl_calc_mg_pll_state(crtc_state, encoder, clock,
&pll_state);
}
} else {
MISSING_CASE(port);
return NULL;
}
if (!ret) {
DRM_DEBUG_KMS("Could not calculate PLL state.\n");
return NULL;
}
crtc_state->dpll_hw_state = pll_state;
pll = intel_find_shared_dpll(crtc, crtc_state, min, max);
if (!pll) {
DRM_DEBUG_KMS("No PLL selected\n");
return NULL;
}
intel_reference_shared_dpll(pll, crtc_state);
return pll;
}
static i915_reg_t icl_pll_id_to_enable_reg(enum intel_dpll_id id)
{
if (intel_dpll_is_combophy(id))
return CNL_DPLL_ENABLE(id);
else if (id == DPLL_ID_ICL_TBTPLL)
return TBT_PLL_ENABLE;
return MG_PLL_ENABLE(icl_pll_id_to_tc_port(id));
}
static bool icl_pll_get_hw_state(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
const enum intel_dpll_id id = pll->info->id;
intel_wakeref_t wakeref;
bool ret = false;
u32 val;
wakeref = intel_display_power_get_if_enabled(dev_priv,
POWER_DOMAIN_PLLS);
if (!wakeref)
return false;
val = I915_READ(icl_pll_id_to_enable_reg(id));
if (!(val & PLL_ENABLE))
goto out;
if (intel_dpll_is_combophy(id) ||
id == DPLL_ID_ICL_TBTPLL) {
hw_state->cfgcr0 = I915_READ(ICL_DPLL_CFGCR0(id));
hw_state->cfgcr1 = I915_READ(ICL_DPLL_CFGCR1(id));
} else {
enum tc_port tc_port = icl_pll_id_to_tc_port(id);
hw_state->mg_refclkin_ctl = I915_READ(MG_REFCLKIN_CTL(tc_port));
hw_state->mg_refclkin_ctl &= MG_REFCLKIN_CTL_OD_2_MUX_MASK;
hw_state->mg_clktop2_coreclkctl1 =
I915_READ(MG_CLKTOP2_CORECLKCTL1(tc_port));
hw_state->mg_clktop2_coreclkctl1 &=
MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO_MASK;
hw_state->mg_clktop2_hsclkctl =
I915_READ(MG_CLKTOP2_HSCLKCTL(tc_port));
hw_state->mg_clktop2_hsclkctl &=
MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK |
MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK |
MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK |
MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK;
hw_state->mg_pll_div0 = I915_READ(MG_PLL_DIV0(tc_port));
hw_state->mg_pll_div1 = I915_READ(MG_PLL_DIV1(tc_port));
hw_state->mg_pll_lf = I915_READ(MG_PLL_LF(tc_port));
hw_state->mg_pll_frac_lock = I915_READ(MG_PLL_FRAC_LOCK(tc_port));
hw_state->mg_pll_ssc = I915_READ(MG_PLL_SSC(tc_port));
hw_state->mg_pll_bias = I915_READ(MG_PLL_BIAS(tc_port));
hw_state->mg_pll_tdc_coldst_bias =
I915_READ(MG_PLL_TDC_COLDST_BIAS(tc_port));
if (dev_priv->cdclk.hw.ref == 38400) {
hw_state->mg_pll_tdc_coldst_bias_mask = MG_PLL_TDC_COLDST_COLDSTART;
hw_state->mg_pll_bias_mask = 0;
} else {
hw_state->mg_pll_tdc_coldst_bias_mask = -1U;
hw_state->mg_pll_bias_mask = -1U;
}
hw_state->mg_pll_tdc_coldst_bias &= hw_state->mg_pll_tdc_coldst_bias_mask;
hw_state->mg_pll_bias &= hw_state->mg_pll_bias_mask;
}
ret = true;
out:
intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS, wakeref);
return ret;
}
static void icl_dpll_write(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
struct intel_dpll_hw_state *hw_state = &pll->state.hw_state;
const enum intel_dpll_id id = pll->info->id;
I915_WRITE(ICL_DPLL_CFGCR0(id), hw_state->cfgcr0);
I915_WRITE(ICL_DPLL_CFGCR1(id), hw_state->cfgcr1);
POSTING_READ(ICL_DPLL_CFGCR1(id));
}
static void icl_mg_pll_write(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
struct intel_dpll_hw_state *hw_state = &pll->state.hw_state;
enum tc_port tc_port = icl_pll_id_to_tc_port(pll->info->id);
u32 val;
/*
* Some of the following registers have reserved fields, so program
* these with RMW based on a mask. The mask can be fixed or generated
* during the calc/readout phase if the mask depends on some other HW
* state like refclk, see icl_calc_mg_pll_state().
*/
val = I915_READ(MG_REFCLKIN_CTL(tc_port));
val &= ~MG_REFCLKIN_CTL_OD_2_MUX_MASK;
val |= hw_state->mg_refclkin_ctl;
I915_WRITE(MG_REFCLKIN_CTL(tc_port), val);
val = I915_READ(MG_CLKTOP2_CORECLKCTL1(tc_port));
val &= ~MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO_MASK;
val |= hw_state->mg_clktop2_coreclkctl1;
I915_WRITE(MG_CLKTOP2_CORECLKCTL1(tc_port), val);
val = I915_READ(MG_CLKTOP2_HSCLKCTL(tc_port));
val &= ~(MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK |
MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK |
MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK |
MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK);
val |= hw_state->mg_clktop2_hsclkctl;
I915_WRITE(MG_CLKTOP2_HSCLKCTL(tc_port), val);
I915_WRITE(MG_PLL_DIV0(tc_port), hw_state->mg_pll_div0);
I915_WRITE(MG_PLL_DIV1(tc_port), hw_state->mg_pll_div1);
I915_WRITE(MG_PLL_LF(tc_port), hw_state->mg_pll_lf);
I915_WRITE(MG_PLL_FRAC_LOCK(tc_port), hw_state->mg_pll_frac_lock);
I915_WRITE(MG_PLL_SSC(tc_port), hw_state->mg_pll_ssc);
val = I915_READ(MG_PLL_BIAS(tc_port));
val &= ~hw_state->mg_pll_bias_mask;
val |= hw_state->mg_pll_bias;
I915_WRITE(MG_PLL_BIAS(tc_port), val);
val = I915_READ(MG_PLL_TDC_COLDST_BIAS(tc_port));
val &= ~hw_state->mg_pll_tdc_coldst_bias_mask;
val |= hw_state->mg_pll_tdc_coldst_bias;
I915_WRITE(MG_PLL_TDC_COLDST_BIAS(tc_port), val);
POSTING_READ(MG_PLL_TDC_COLDST_BIAS(tc_port));
}
static void icl_pll_enable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
i915_reg_t enable_reg = icl_pll_id_to_enable_reg(id);
u32 val;
val = I915_READ(enable_reg);
val |= PLL_POWER_ENABLE;
I915_WRITE(enable_reg, val);
/*
* The spec says we need to "wait" but it also says it should be
* immediate.
*/
if (intel_wait_for_register(dev_priv, enable_reg, PLL_POWER_STATE,
PLL_POWER_STATE, 1))
DRM_ERROR("PLL %d Power not enabled\n", id);
if (intel_dpll_is_combophy(id) || id == DPLL_ID_ICL_TBTPLL)
icl_dpll_write(dev_priv, pll);
else
icl_mg_pll_write(dev_priv, pll);
/*
* DVFS pre sequence would be here, but in our driver the cdclk code
* paths should already be setting the appropriate voltage, hence we do
* nothign here.
*/
val = I915_READ(enable_reg);
val |= PLL_ENABLE;
I915_WRITE(enable_reg, val);
if (intel_wait_for_register(dev_priv, enable_reg, PLL_LOCK, PLL_LOCK,
1)) /* 600us actually. */
DRM_ERROR("PLL %d not locked\n", id);
/* DVFS post sequence would be here. See the comment above. */
}
static void icl_pll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
const enum intel_dpll_id id = pll->info->id;
i915_reg_t enable_reg = icl_pll_id_to_enable_reg(id);
u32 val;
/* The first steps are done by intel_ddi_post_disable(). */
/*
* DVFS pre sequence would be here, but in our driver the cdclk code
* paths should already be setting the appropriate voltage, hence we do
* nothign here.
*/
val = I915_READ(enable_reg);
val &= ~PLL_ENABLE;
I915_WRITE(enable_reg, val);
/* Timeout is actually 1us. */
if (intel_wait_for_register(dev_priv, enable_reg, PLL_LOCK, 0, 1))
DRM_ERROR("PLL %d locked\n", id);
/* DVFS post sequence would be here. See the comment above. */
val = I915_READ(enable_reg);
val &= ~PLL_POWER_ENABLE;
I915_WRITE(enable_reg, val);
/*
* The spec says we need to "wait" but it also says it should be
* immediate.
*/
if (intel_wait_for_register(dev_priv, enable_reg, PLL_POWER_STATE, 0,
1))
DRM_ERROR("PLL %d Power not disabled\n", id);
}
static void icl_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
DRM_DEBUG_KMS("dpll_hw_state: cfgcr0: 0x%x, cfgcr1: 0x%x, "
"mg_refclkin_ctl: 0x%x, hg_clktop2_coreclkctl1: 0x%x, "
"mg_clktop2_hsclkctl: 0x%x, mg_pll_div0: 0x%x, "
"mg_pll_div2: 0x%x, mg_pll_lf: 0x%x, "
"mg_pll_frac_lock: 0x%x, mg_pll_ssc: 0x%x, "
"mg_pll_bias: 0x%x, mg_pll_tdc_coldst_bias: 0x%x\n",
hw_state->cfgcr0, hw_state->cfgcr1,
hw_state->mg_refclkin_ctl,
hw_state->mg_clktop2_coreclkctl1,
hw_state->mg_clktop2_hsclkctl,
hw_state->mg_pll_div0,
hw_state->mg_pll_div1,
hw_state->mg_pll_lf,
hw_state->mg_pll_frac_lock,
hw_state->mg_pll_ssc,
hw_state->mg_pll_bias,
hw_state->mg_pll_tdc_coldst_bias);
}
static const struct intel_shared_dpll_funcs icl_pll_funcs = {
.enable = icl_pll_enable,
.disable = icl_pll_disable,
.get_hw_state = icl_pll_get_hw_state,
};
static const struct dpll_info icl_plls[] = {
{ "DPLL 0", &icl_pll_funcs, DPLL_ID_ICL_DPLL0, 0 },
{ "DPLL 1", &icl_pll_funcs, DPLL_ID_ICL_DPLL1, 0 },
{ "TBT PLL", &icl_pll_funcs, DPLL_ID_ICL_TBTPLL, 0 },
{ "MG PLL 1", &icl_pll_funcs, DPLL_ID_ICL_MGPLL1, 0 },
{ "MG PLL 2", &icl_pll_funcs, DPLL_ID_ICL_MGPLL2, 0 },
{ "MG PLL 3", &icl_pll_funcs, DPLL_ID_ICL_MGPLL3, 0 },
{ "MG PLL 4", &icl_pll_funcs, DPLL_ID_ICL_MGPLL4, 0 },
{ },
};
static const struct intel_dpll_mgr icl_pll_mgr = {
.dpll_info = icl_plls,
.get_dpll = icl_get_dpll,
.dump_hw_state = icl_dump_hw_state,
};
/**
* intel_shared_dpll_init - Initialize shared DPLLs
* @dev: drm device
*
* Initialize shared DPLLs for @dev.
*/
void intel_shared_dpll_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
const struct intel_dpll_mgr *dpll_mgr = NULL;
const struct dpll_info *dpll_info;
int i;
if (IS_ICELAKE(dev_priv))
dpll_mgr = &icl_pll_mgr;
else if (IS_CANNONLAKE(dev_priv))
dpll_mgr = &cnl_pll_mgr;
else if (IS_GEN9_BC(dev_priv))
dpll_mgr = &skl_pll_mgr;
else if (IS_GEN9_LP(dev_priv))
dpll_mgr = &bxt_pll_mgr;
else if (HAS_DDI(dev_priv))
dpll_mgr = &hsw_pll_mgr;
else if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv))
dpll_mgr = &pch_pll_mgr;
if (!dpll_mgr) {
dev_priv->num_shared_dpll = 0;
return;
}
dpll_info = dpll_mgr->dpll_info;
for (i = 0; dpll_info[i].name; i++) {
WARN_ON(i != dpll_info[i].id);
dev_priv->shared_dplls[i].info = &dpll_info[i];
}
dev_priv->dpll_mgr = dpll_mgr;
dev_priv->num_shared_dpll = i;
mutex_init(&dev_priv->dpll_lock);
BUG_ON(dev_priv->num_shared_dpll > I915_NUM_PLLS);
/* FIXME: Move this to a more suitable place */
if (HAS_DDI(dev_priv))
intel_ddi_pll_init(dev);
}
/**
* intel_get_shared_dpll - get a shared DPLL for CRTC and encoder combination
* @crtc: CRTC
* @crtc_state: atomic state for @crtc
* @encoder: encoder
*
* Find an appropriate DPLL for the given CRTC and encoder combination. A
* reference from the @crtc to the returned pll is registered in the atomic
* state. That configuration is made effective by calling
* intel_shared_dpll_swap_state(). The reference should be released by calling
* intel_release_shared_dpll().
*
* Returns:
* A shared DPLL to be used by @crtc and @encoder with the given @crtc_state.
*/
struct intel_shared_dpll *
intel_get_shared_dpll(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
const struct intel_dpll_mgr *dpll_mgr = dev_priv->dpll_mgr;
if (WARN_ON(!dpll_mgr))
return NULL;
return dpll_mgr->get_dpll(crtc, crtc_state, encoder);
}
/**
* intel_release_shared_dpll - end use of DPLL by CRTC in atomic state
* @dpll: dpll in use by @crtc
* @crtc: crtc
* @state: atomic state
*
* This function releases the reference from @crtc to @dpll from the
* atomic @state. The new configuration is made effective by calling
* intel_shared_dpll_swap_state().
*/
void intel_release_shared_dpll(struct intel_shared_dpll *dpll,
struct intel_crtc *crtc,
struct drm_atomic_state *state)
{
struct intel_shared_dpll_state *shared_dpll_state;
shared_dpll_state = intel_atomic_get_shared_dpll_state(state);
shared_dpll_state[dpll->info->id].crtc_mask &= ~(1 << crtc->pipe);
}
/**
* intel_shared_dpll_dump_hw_state - write hw_state to dmesg
* @dev_priv: i915 drm device
* @hw_state: hw state to be written to the log
*
* Write the relevant values in @hw_state to dmesg using DRM_DEBUG_KMS.
*/
void intel_dpll_dump_hw_state(struct drm_i915_private *dev_priv,
struct intel_dpll_hw_state *hw_state)
{
if (dev_priv->dpll_mgr) {
dev_priv->dpll_mgr->dump_hw_state(dev_priv, hw_state);
} else {
/* fallback for platforms that don't use the shared dpll
* infrastructure
*/
DRM_DEBUG_KMS("dpll_hw_state: dpll: 0x%x, dpll_md: 0x%x, "
"fp0: 0x%x, fp1: 0x%x\n",
hw_state->dpll,
hw_state->dpll_md,
hw_state->fp0,
hw_state->fp1);
}
}
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