diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 40 |
1 files changed, 15 insertions, 25 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 76e977b0070e..69957f889432 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -202,13 +202,13 @@ static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv, #define ibx_disable_display_interrupt(dev_priv, bits) \ ibx_display_interrupt_update((dev_priv), (bits), 0) -static void ibx_set_fifo_underrun_reporting(struct intel_crtc *crtc, +static void ibx_set_fifo_underrun_reporting(struct drm_device *dev, + enum transcoder pch_transcoder, bool enable) { - struct drm_device *dev = crtc->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - uint32_t bit = (crtc->pipe == PIPE_A) ? SDE_TRANSA_FIFO_UNDER : - SDE_TRANSB_FIFO_UNDER; + uint32_t bit = (pch_transcoder == TRANSCODER_A) ? + SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER; if (enable) ibx_enable_display_interrupt(dev_priv, bit); @@ -306,29 +306,19 @@ bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev, bool enable) { struct drm_i915_private *dev_priv = dev->dev_private; - enum pipe p; - struct drm_crtc *crtc; - struct intel_crtc *intel_crtc; + struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder]; + struct intel_crtc *intel_crtc = to_intel_crtc(crtc); unsigned long flags; bool ret; - if (HAS_PCH_LPT(dev)) { - crtc = NULL; - for_each_pipe(p) { - struct drm_crtc *c = dev_priv->pipe_to_crtc_mapping[p]; - if (intel_pipe_has_type(c, INTEL_OUTPUT_ANALOG)) { - crtc = c; - break; - } - } - if (!crtc) { - DRM_ERROR("PCH FIFO underrun, but no CRTC using the PCH found\n"); - return false; - } - } else { - crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder]; - } - intel_crtc = to_intel_crtc(crtc); + /* + * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT + * has only one pch transcoder A that all pipes can use. To avoid racy + * pch transcoder -> pipe lookups from interrupt code simply store the + * underrun statistics in crtc A. Since we never expose this anywhere + * nor use it outside of the fifo underrun code here using the "wrong" + * crtc on LPT won't cause issues. + */ spin_lock_irqsave(&dev_priv->irq_lock, flags); @@ -340,7 +330,7 @@ bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev, intel_crtc->pch_fifo_underrun_disabled = !enable; if (HAS_PCH_IBX(dev)) - ibx_set_fifo_underrun_reporting(intel_crtc, enable); + ibx_set_fifo_underrun_reporting(dev, pch_transcoder, enable); else cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable); |