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drm/i915: update watermarks before enabling PLLs 

When coming back from DPMS or turning on a display, make sure we have
the watermarks set up before turning on the display plane, otherwise we
may get underruns.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Dirk Hohndel <hohndel@infradead.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2009-10-20 07:37:32 +09:00 committed by Eric Anholt
parent 0e442c60dd
commit 629598da93
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_display.c
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@ -1803,6 +1803,8 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
case DRM_MODE_DPMS_ON:
case DRM_MODE_DPMS_STANDBY:
case DRM_MODE_DPMS_SUSPEND:
intel_update_watermarks(dev);
/* Enable the DPLL */
temp = I915_READ(dpll_reg);
if ((temp & DPLL_VCO_ENABLE) == 0) {
@ -1840,7 +1842,6 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
/* Give the overlay scaler a chance to enable if it's on this pipe */
//intel_crtc_dpms_video(crtc, true); TODO
intel_update_watermarks(dev);
break;
case DRM_MODE_DPMS_OFF:
intel_update_watermarks(dev);