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drm/i915/vlv: reset DPIO on load and resume v2

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DPIO needs to have common reset de-asserted on soft resets like boot and
S3.  In some cases, the BIOS will have done this for us, but it should
be safe to do at runtime as well, as long as we do it when the pipes are
otherwise off.

v2: update bit name to match docs better (Ville)
    reset after CRI clock select (Ville)

References: https://bugs.freedesktop.org/show_bug.cgi?id=69166
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2013-10-03 11:35:46 -07:00 committed by Daniel Vetter
parent a031d709bb
commit 40e9cf649a
2 changed files with 23 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -430,7 +430,7 @@
#define DPIO_MODSEL1 (1<<3) /* if ref clk b == 27 */
#define DPIO_MODSEL0 (1<<2) /* if ref clk a == 27 */
#define DPIO_SFR_BYPASS (1<<1)
#define DPIO_RESET (1<<0)
#define DPIO_CMNRST (1<<0)
#define _DPIO_TX3_SWING_CTL4_A 0x690
#define _DPIO_TX3_SWING_CTL4_B 0x2a90

22
drivers/gpu/drm/i915/intel_display.c
View File

@ -1360,6 +1360,26 @@ static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
assert_pch_hdmi_disabled(dev_priv, pipe, PCH_HDMID);
}
static void intel_init_dpio(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (!IS_VALLEYVIEW(dev))
return;
/*
* From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
* 6. De-assert cmn_reset/side_reset. Same as VLV X0.
* a. GUnit 0x2110 bit[0] set to 1 (def 0)
* b. The other bits such as sfr settings / modesel may all be set
* to 0.
*
* This should only be done on init and resume from S3 with both
* PLLs disabled, or we risk losing DPIO and PLL synchronization.
*/
I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
}
static void vlv_enable_pll(struct intel_crtc *crtc)
{
struct drm_device *dev = crtc->base.dev;
@ -10370,6 +10390,8 @@ void intel_modeset_init_hw(struct drm_device *dev)
I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
DPLL_INTEGRATED_CRI_CLK_VLV);
intel_init_dpio(dev);
mutex_lock(&dev->struct_mutex);
intel_enable_gt_powersave(dev);
mutex_unlock(&dev->struct_mutex);