From: Ville Syrjälä Date: Fri, 30 Oct 2015 17:22:21 +0000 (+0200) Subject: drm/i915: Check for FIFO underruns after modeset on IVB/HSW and CPT/PPT X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=aca7b684bab9da1e3071ad872f1d78d41ae7a706;p=linux-beck.git drm/i915: Check for FIFO underruns after modeset on IVB/HSW and CPT/PPT Due to the shared error interrupt on IVB/HSW and CPT/PPT we may not always get an interrupt on a FIFO underrun. But we can always do an explicit check (like we do on GMCH platforms that have no underrun interrupt). v2: Drop stale kerneldoc for i9xx_check_fifo_underruns() (Daniel) Signed-off-by: Ville Syrjälä Reviewed-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1446225741-11070-1-git-send-email-ville.syrjala@linux.intel.com --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index f859f86c18b0..5046b99da459 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4688,9 +4688,9 @@ intel_post_enable_primary(struct drm_crtc *crtc) if (IS_GEN2(dev)) intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true); - /* Underruns don't raise interrupts, so check manually. */ - if (HAS_GMCH_DISPLAY(dev)) - i9xx_check_fifo_underruns(dev_priv); + /* Underruns don't always raise interrupts, so check manually. */ + intel_check_cpu_fifo_underruns(dev_priv); + intel_check_pch_fifo_underruns(dev_priv); } /** diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0f8fd140b632..d45677436170 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -965,7 +965,8 @@ void intel_cpu_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv, enum pipe pipe); void intel_pch_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv, enum transcoder pch_transcoder); -void i9xx_check_fifo_underruns(struct drm_i915_private *dev_priv); +void intel_check_cpu_fifo_underruns(struct drm_i915_private *dev_priv); +void intel_check_pch_fifo_underruns(struct drm_i915_private *dev_priv); /* i915_irq.c */ void gen5_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask); diff --git a/drivers/gpu/drm/i915/intel_fifo_underrun.c b/drivers/gpu/drm/i915/intel_fifo_underrun.c index 54daa66c6970..af906c7db5c3 100644 --- a/drivers/gpu/drm/i915/intel_fifo_underrun.c +++ b/drivers/gpu/drm/i915/intel_fifo_underrun.c @@ -84,38 +84,21 @@ static bool cpt_can_enable_serr_int(struct drm_device *dev) return true; } -/** - * i9xx_check_fifo_underruns - check for fifo underruns - * @dev_priv: i915 device instance - * - * This function checks for fifo underruns on GMCH platforms. This needs to be - * done manually on modeset to make sure that we catch all underruns since they - * do not generate an interrupt by themselves on these platforms. - */ -void i9xx_check_fifo_underruns(struct drm_i915_private *dev_priv) +static void i9xx_check_fifo_underruns(struct intel_crtc *crtc) { - struct intel_crtc *crtc; - - spin_lock_irq(&dev_priv->irq_lock); - - for_each_intel_crtc(dev_priv->dev, crtc) { - u32 reg = PIPESTAT(crtc->pipe); - u32 pipestat; - - if (crtc->cpu_fifo_underrun_disabled) - continue; + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + u32 reg = PIPESTAT(crtc->pipe); + u32 pipestat = I915_READ(reg) & 0xffff0000; - pipestat = I915_READ(reg) & 0xffff0000; - if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0) - continue; + assert_spin_locked(&dev_priv->irq_lock); - I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS); - POSTING_READ(reg); + if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0) + return; - DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe)); - } + I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS); + POSTING_READ(reg); - spin_unlock_irq(&dev_priv->irq_lock); + DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe)); } static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev, @@ -150,6 +133,23 @@ static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev, ironlake_disable_display_irq(dev_priv, bit); } +static void ivybridge_check_fifo_underruns(struct intel_crtc *crtc) +{ + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + enum pipe pipe = crtc->pipe; + uint32_t err_int = I915_READ(GEN7_ERR_INT); + + assert_spin_locked(&dev_priv->irq_lock); + + if ((err_int & ERR_INT_FIFO_UNDERRUN(pipe)) == 0) + return; + + I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe)); + POSTING_READ(GEN7_ERR_INT); + + DRM_ERROR("fifo underrun on pipe %c\n", pipe_name(pipe)); +} + static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev, enum pipe pipe, bool enable, bool old) @@ -202,6 +202,24 @@ static void ibx_set_fifo_underrun_reporting(struct drm_device *dev, ibx_disable_display_interrupt(dev_priv, bit); } +static void cpt_check_pch_fifo_underruns(struct intel_crtc *crtc) +{ + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + enum transcoder pch_transcoder = (enum transcoder) crtc->pipe; + uint32_t serr_int = I915_READ(SERR_INT); + + assert_spin_locked(&dev_priv->irq_lock); + + if ((serr_int & SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) == 0) + return; + + I915_WRITE(SERR_INT, SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)); + POSTING_READ(SERR_INT); + + DRM_ERROR("pch fifo underrun on pch transcoder %c\n", + transcoder_name(pch_transcoder)); +} + static void cpt_set_fifo_underrun_reporting(struct drm_device *dev, enum transcoder pch_transcoder, bool enable, bool old) @@ -375,3 +393,56 @@ void intel_pch_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv, DRM_ERROR("PCH transcoder %c FIFO underrun\n", transcoder_name(pch_transcoder)); } + +/** + * intel_check_cpu_fifo_underruns - check for CPU fifo underruns immediately + * @dev_priv: i915 device instance + * + * Check for CPU fifo underruns immediately. Useful on IVB/HSW where the shared + * error interrupt may have been disabled, and so CPU fifo underruns won't + * necessarily raise an interrupt, and on GMCH platforms where underruns never + * raise an interrupt. + */ +void intel_check_cpu_fifo_underruns(struct drm_i915_private *dev_priv) +{ + struct intel_crtc *crtc; + + spin_lock_irq(&dev_priv->irq_lock); + + for_each_intel_crtc(dev_priv->dev, crtc) { + if (crtc->cpu_fifo_underrun_disabled) + continue; + + if (HAS_GMCH_DISPLAY(dev_priv)) + i9xx_check_fifo_underruns(crtc); + else if (IS_GEN7(dev_priv)) + ivybridge_check_fifo_underruns(crtc); + } + + spin_unlock_irq(&dev_priv->irq_lock); +} + +/** + * intel_check_pch_fifo_underruns - check for PCH fifo underruns immediately + * @dev_priv: i915 device instance + * + * Check for PCH fifo underruns immediately. Useful on CPT/PPT where the shared + * error interrupt may have been disabled, and so PCH fifo underruns won't + * necessarily raise an interrupt. + */ +void intel_check_pch_fifo_underruns(struct drm_i915_private *dev_priv) +{ + struct intel_crtc *crtc; + + spin_lock_irq(&dev_priv->irq_lock); + + for_each_intel_crtc(dev_priv->dev, crtc) { + if (crtc->pch_fifo_underrun_disabled) + continue; + + if (HAS_PCH_CPT(dev_priv)) + cpt_check_pch_fifo_underruns(crtc); + } + + spin_unlock_irq(&dev_priv->irq_lock); +}