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drm/i915: Check for FIFO underruns at the end of modeset on gmch

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FIFO underruns don't generate interrupts on gmch platforms, so
if we want to know whether a modeset triggered FIFO underruns we
need to explicitly check for them.

As a modeset on one pipe could cause underruns on other pipes,
check for underruns on all pipes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Thomas Wood <thomas.wood@intel.com>
[danvet: Fix up merge error, kudos to Ville for noticing it.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-05-16 19:40:22 +03:00 committed by Daniel Vetter
parent e69abff0d6
commit 56b80e1f00
3 changed files with 35 additions and 0 deletions

28
drivers/gpu/drm/i915/i915_irq.c

@ -306,6 +306,34 @@ static bool cpt_can_enable_serr_int(struct drm_device *dev)
return true;
}
void i9xx_check_fifo_underruns(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *crtc;
unsigned long flags;
spin_lock_irqsave(&dev_priv->irq_lock, flags);
for_each_intel_crtc(dev, crtc) {
u32 reg = PIPESTAT(crtc->pipe);
u32 pipestat;
if (crtc->cpu_fifo_underrun_disabled)
continue;
pipestat = I915_READ(reg) & 0xffff0000;
if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0)
continue;
I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
POSTING_READ(reg);
DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe));
}
spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
}
static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev,
enum pipe pipe, bool enable)
{

6
drivers/gpu/drm/i915/intel_display.c

@ -4625,6 +4625,9 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
intel_crtc_enable_planes(crtc);
drm_crtc_vblank_on(crtc);
/* Underruns don't raise interrupts, so check manually. */
i9xx_check_fifo_underruns(dev);
}
static void i9xx_set_pll_dividers(struct intel_crtc *crtc)
@ -4704,6 +4707,9 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
intel_crtc_enable_planes(crtc);
drm_crtc_vblank_on(crtc);
/* Underruns don't raise interrupts, so check manually. */
i9xx_check_fifo_underruns(dev);
}
static void i9xx_pfit_disable(struct intel_crtc *crtc)

1
drivers/gpu/drm/i915/intel_drv.h

@ -680,6 +680,7 @@ void bdw_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
void intel_runtime_pm_disable_interrupts(struct drm_device *dev);
void intel_runtime_pm_restore_interrupts(struct drm_device *dev);
int intel_get_crtc_scanline(struct intel_crtc *crtc);
void i9xx_check_fifo_underruns(struct drm_device *dev);
/* intel_crt.c */