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drm/i915: Suppress spurious underruns on gen2

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Often we seem to detect an underrun right after modeset on gen2.
It seems to be a spurious detection (potentially the pipe is still
in a wonky state when we enable the planes). An extra vblank wait
seems to cure it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200429101034.8208-13-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
This commit is contained in:
Ville Syrjälä 2020-04-29 13:10:34 +03:00
parent 42ae1f88fe
commit f6a7d3952c
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_display.c
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@ -7526,6 +7526,10 @@ static void i9xx_crtc_enable(struct intel_atomic_state *state,
intel_crtc_vblank_on(new_crtc_state);
intel_encoders_enable(state, crtc);
/* prevents spurious underruns */
if (IS_GEN(dev_priv, 2))
intel_wait_for_vblank(dev_priv, pipe);
}
static void i9xx_pfit_disable(const struct intel_crtc_state *old_crtc_state)