Atm we call the handlers for pending pipestat interrupt events even if they aren't explicitly enabled by i915_enable_pipestat(). This isn't an issue for events other than the vblank start event, since those are always enabled anyways. Otoh, we enable the vblank start event on-demand, so we'll end up calling the vblank handler at times when they are disabled.
I haven't checked if this causes any real problem, but for consistency and to remove some overhead we should still fix this by clearing / handling only the enabled interrupt events. Also this is a dependency for the upcoming VLV power domain patchset where we need to disable all the pipestat interrupts whenever the display power well is off. Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_irq.c | 33 ++++++++++++++++++++++++++++++--- drivers/gpu/drm/i915/i915_reg.h | 4 ++++ 3 files changed, 35 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 43f37ca..faca5b4 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1427,6 +1427,7 @@ typedef struct drm_i915_private { }; u32 gt_irq_mask; u32 pm_irq_mask; + u32 pipestat_irq_mask[I915_MAX_PIPES]; struct work_struct hotplug_work; bool enable_hotplug_processing; diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index eea5398..2cac477 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -419,6 +419,16 @@ done: return ret; } +static bool __cpu_fifo_underrun_reporting_enabled(struct drm_device *dev, + enum pipe pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe]; + struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + + return !intel_crtc->cpu_fifo_underrun_disabled; +} + /** * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages * @dev: drm device @@ -520,6 +530,8 @@ i915_enable_pipestat(drm_i915_private_t *dev_priv, enum pipe pipe, if ((pipestat & enable_mask) == enable_mask) return; + dev_priv->pipestat_irq_mask[pipe] |= status_mask; + /* Enable the interrupt, clear any pending status */ pipestat |= enable_mask | status_mask; I915_WRITE(reg, pipestat); @@ -550,6 +562,8 @@ i915_disable_pipestat(drm_i915_private_t *dev_priv, enum pipe pipe, if ((pipestat & enable_mask) == 0) return; + dev_priv->pipestat_irq_mask[pipe] &= ~status_mask; + pipestat &= ~enable_mask; I915_WRITE(reg, pipestat); POSTING_READ(reg); @@ -1530,18 +1544,31 @@ static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir) static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir) { drm_i915_private_t *dev_priv = dev->dev_private; - u32 pipe_stats[I915_MAX_PIPES]; + u32 pipe_stats[I915_MAX_PIPES] = { }; int pipe; spin_lock(&dev_priv->irq_lock); for_each_pipe(pipe) { - int reg = PIPESTAT(pipe); + int reg; + u32 mask; + + if (!dev_priv->pipestat_irq_mask[pipe] && + !__cpu_fifo_underrun_reporting_enabled(dev, pipe)) + continue; + + reg = PIPESTAT(pipe); pipe_stats[pipe] = I915_READ(reg); /* * Clear the PIPE*STAT regs before the IIR */ - if (pipe_stats[pipe] & 0x8000ffff) + mask = PIPESTAT_INT_ENABLE_MASK | PIPE_FIFO_UNDERRUN_STATUS; + if (iir & I915_DISPLAY_PIPE_EVENT_INTERRUPT(pipe)) + mask |= dev_priv->pipestat_irq_mask[pipe]; + pipe_stats[pipe] &= mask; + + if (pipe_stats[pipe] & (PIPE_FIFO_UNDERRUN_STATUS | + PIPESTAT_INT_STATUS_MASK)) I915_WRITE(reg, pipe_stats[pipe]); } spin_unlock(&dev_priv->irq_lock); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index c998c4f..47e0635 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -997,6 +997,10 @@ #define I915_DISPLAY_PIPE_A_EVENT_INTERRUPT (1<<6) #define I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT (1<<5) #define I915_DISPLAY_PIPE_B_EVENT_INTERRUPT (1<<4) +#define I915_DISPLAY_PIPE_EVENT_INTERRUPT(pipe) \ + ((pipe) == PIPE_A ? I915_DISPLAY_PIPE_A_EVENT_INTERRUPT : \ + I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) + #define I915_DEBUG_INTERRUPT (1<<2) #define I915_USER_INTERRUPT (1<<1) #define I915_ASLE_INTERRUPT (1<<0) -- 1.8.4 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
