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drm/i915: Refactor LPT-H VGA dotclock disabling

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Extract the LPT-H VGA dotclock disable to a separate function in
anticipation of further use.

While at it move the sb_lock locking inwards when enabling the VGA
dotclock, as it's only needed to protect the sideband accesses.

v2: Keep the PIXCLK_GATE_GATE name for 0 (Paulo)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449260494-14449-1-git-send-email-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2015-12-04 22:21:34 +02:00
parent 92966a378f
commit 060f02d81d
1 changed files with 20 additions and 14 deletions
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34
drivers/gpu/drm/i915/intel_display.c
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@ -3940,6 +3940,21 @@ static int intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
return 0;
}
static void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
{
u32 temp;
I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);
mutex_lock(&dev_priv->sb_lock);
temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
temp |= SBI_SSCCTL_DISABLE;
intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);
mutex_unlock(&dev_priv->sb_lock);
}
/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(struct drm_crtc *crtc)
{
@ -3949,18 +3964,7 @@ static void lpt_program_iclkip(struct drm_crtc *crtc)
u32 divsel, phaseinc, auxdiv, phasedir = 0;
u32 temp;
mutex_lock(&dev_priv->sb_lock);
/* It is necessary to ungate the pixclk gate prior to programming
* the divisors, and gate it back when it is done.
*/
I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);
/* Disable SSCCTL */
intel_sbi_write(dev_priv, SBI_SSCCTL6,
intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK) |
SBI_SSCCTL_DISABLE,
SBI_ICLK);
lpt_disable_iclkip(dev_priv);
/* 20MHz is a corner case which is out of range for the 7-bit divisor */
if (clock == 20000) {
@ -4000,6 +4004,8 @@ static void lpt_program_iclkip(struct drm_crtc *crtc)
phasedir,
phaseinc);
mutex_lock(&dev_priv->sb_lock);
/* Program SSCDIVINTPHASE6 */
temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
@ -4021,12 +4027,12 @@ static void lpt_program_iclkip(struct drm_crtc *crtc)
temp &= ~SBI_SSCCTL_DISABLE;
intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);
mutex_unlock(&dev_priv->sb_lock);
/* Wait for initialization time */
udelay(24);
I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE);
mutex_unlock(&dev_priv->sb_lock);
}
static void ironlake_pch_transcoder_set_timings(struct intel_crtc *crtc,