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drm/i915: Re-enable vblank irqs for already active pipes 

If a pipe is already active when we init/resume there might not be a
full modeset afterwards so drm_vblank_on() may not get called. In such
a case if someone is holding a vblank reference across a suspend/resume
cycle drm_vblank_get() called after resuming won't re-enable the vblank
interrupts.

So in order to make sure vblank interrupts get re-enabled post-resume,
call drm_vblank_on() in intel_sanitize_crtc() if the crtc is already
active.

v2: Also drm_vblank_off() if the pipe got disabled magically

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Testecase: igt/kms_flip/vblank-vs-suspend
Tested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-05-20 17:20:05 +03:00 committed by Daniel Vetter
parent d40d91876a
commit d3eaf8843d
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/intel_display.c
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@ -11778,6 +11778,12 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc)
reg = PIPECONF(crtc->config.cpu_transcoder);
I915_WRITE(reg, I915_READ(reg) & ~PIPECONF_FRAME_START_DELAY_MASK);
/* restore vblank interrupts to correct state */
if (crtc->active)
drm_vblank_on(dev, crtc->pipe);
else
drm_vblank_off(dev, crtc->pipe);
/* We need to sanitize the plane -> pipe mapping first because this will
* disable the crtc (and hence change the state) if it is wrong. Note
* that gen4+ has a fixed plane -> pipe mapping. */