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drm/i915: Suppress spurious CPU FIFO underruns on ILK-IVB

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We still get spurious pipe underruns on ILK/SNB/IVB under two
circumstances when dealing with PCH ports:
* When the pipe has been disabled, but FDI RX/TX is still enabled
* During FDI link training

Both cases seem to happen at least when we do VGA+HDMI cloning
from the same pipe. I don't think I've seen them when not cloning,
but can't be 100% sure.

Disable underrun reporting around those places to eliminate the
dmesg errors.

Testcase: igt/kms_setmode/basic-clone-single-crtc
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-1-git-send-email-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Ville Syrjälä 2015-11-20 22:09:18 +02:00
parent b6e4d53490
commit 3860b2ecfc
1 changed files with 19 additions and 1 deletions
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20
drivers/gpu/drm/i915/intel_display.c
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@ -4137,6 +4137,12 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
I915_WRITE(FDI_RX_TUSIZE1(pipe),
I915_READ(PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);
/*
* Sometimes spurious CPU pipe underruns happen during FDI
* training, at least with VGA+HDMI cloning. Suppress them.
*/
intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
/* For PCH output, training FDI link */
dev_priv->display.fdi_link_train(crtc);
@ -4170,6 +4176,8 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
intel_fdi_normal_train(crtc);
intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
/* For PCH DP, enable TRANS_DP_CTL */
if (HAS_PCH_CPT(dev) && intel_crtc->config->has_dp_encoder) {
const struct drm_display_mode *adjusted_mode =
@ -5062,12 +5070,22 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
drm_crtc_vblank_off(crtc);
assert_vblank_disabled(crtc);
/*
* Sometimes spurious CPU pipe underruns happen when the
* pipe is already disabled, but FDI RX/TX is still enabled.
* Happens at least with VGA+HDMI cloning. Suppress them.
*/
if (intel_crtc->config->has_pch_encoder)
intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
intel_disable_pipe(intel_crtc);
ironlake_pfit_disable(intel_crtc, false);
if (intel_crtc->config->has_pch_encoder)
if (intel_crtc->config->has_pch_encoder) {
ironlake_fdi_disable(crtc);
intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
}
for_each_encoder_on_crtc(dev, crtc, encoder)
if (encoder->post_disable)