drm/i915: wait for actual vblank, not just 20ms
Waiting for a hard coded 20ms isn't always enough to make sure a vblank
period has actually occurred, so add code to make sure we really have
passed through a vblank period (or that the pipe is off when disabling).
This prevents problems with mode setting and link training, and seems to
fix a bug like https://bugs.freedesktop.org/show_bug.cgi?id=29278, but
on an HP 8440p instead. Hopefully also fixes
https://bugs.freedesktop.org/show_bug.cgi?id=29141.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 1bd6e87..d2029ef 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1158,11 +1158,11 @@
/* Wait for vblank for the disable to take effect */
if (!IS_I9XX(dev))
- intel_wait_for_vblank(dev);
+ intel_wait_for_vblank(dev, intel_crtc->pipe);
I915_WRITE(pipeconf_reg, pipeconf & ~PIPEACONF_ENABLE);
/* Wait for vblank for the disable to take effect. */
- intel_wait_for_vblank(dev);
+ intel_wait_for_vblank(dev, intel_crtc->pipe);
/* Filter ctl must be set before TV_WIN_SIZE */
I915_WRITE(TV_FILTER_CTL_1, TV_AUTO_SCALE);
@@ -1231,6 +1231,7 @@
struct drm_encoder *encoder = &intel_tv->base.enc;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
unsigned long irqflags;
u32 tv_ctl, save_tv_ctl;
u32 tv_dac, save_tv_dac;
@@ -1267,11 +1268,11 @@
DAC_C_0_7_V);
I915_WRITE(TV_CTL, tv_ctl);
I915_WRITE(TV_DAC, tv_dac);
- intel_wait_for_vblank(dev);
+ intel_wait_for_vblank(dev, intel_crtc->pipe);
tv_dac = I915_READ(TV_DAC);
I915_WRITE(TV_DAC, save_tv_dac);
I915_WRITE(TV_CTL, save_tv_ctl);
- intel_wait_for_vblank(dev);
+ intel_wait_for_vblank(dev, intel_crtc->pipe);
/*
* A B C
* 0 1 1 Composite