From 7336df6512440a494d3a705dfc6a883a42733c8f Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 9 Jul 2013 22:59:16 +0200 Subject: [PATCH] drm/i915: improve GEN7_ERR_INT clearing for fifo underrun reporting Same treatment as for SERR_INT: If we clear only the bit for the pipe we're enabling (but unconditionally) then we can always check for possible underruns after having disabled the interrupt. That way pipe underruns won't be lost, but at worst only get reported in a delayed fashion. v2: The same logic bug as in the SERR handling change also existed here. The same bugfix of only reporting missed underruns when the error interrupt was masked applies, too. v3: Do the same fixes as for the SERR handling that Paulo suggested in his review: - s/%i/%c/ fix in the debug output - move the DE_ERR_INT_IVB read into the respective if block Cc: Paulo Zanoni Reviewed-by: Paulo Zanoni [danvet: Fix up the checkpatch bikeshed Paulo noticed.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_irq.c | 20 +++++++++++++------- drivers/gpu/drm/i915/i915_reg.h | 1 + 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index dd9d9997e90b..76e977b0070e 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -154,21 +154,27 @@ static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev, } static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev, - bool enable) + enum pipe pipe, bool enable) { struct drm_i915_private *dev_priv = dev->dev_private; - if (enable) { + I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe)); + if (!ivb_can_enable_err_int(dev)) return; - I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN_A | - ERR_INT_FIFO_UNDERRUN_B | - ERR_INT_FIFO_UNDERRUN_C); - ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB); } else { + bool was_enabled = !(I915_READ(DEIMR) & DE_ERR_INT_IVB); + + /* Change the state _after_ we've read out the current one. */ ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB); + + if (!was_enabled && + (I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe))) { + DRM_DEBUG_KMS("uncleared fifo underrun on pipe %c\n", + pipe_name(pipe)); + } } } @@ -274,7 +280,7 @@ bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev, if (IS_GEN5(dev) || IS_GEN6(dev)) ironlake_set_fifo_underrun_reporting(dev, pipe, enable); else if (IS_GEN7(dev)) - ivybridge_set_fifo_underrun_reporting(dev, enable); + ivybridge_set_fifo_underrun_reporting(dev, pipe, enable); done: spin_unlock_irqrestore(&dev_priv->irq_lock, flags); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 7e2684fe4d3a..dc3d6a74f391 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -681,6 +681,7 @@ #define ERR_INT_FIFO_UNDERRUN_C (1<<6) #define ERR_INT_FIFO_UNDERRUN_B (1<<3) #define ERR_INT_FIFO_UNDERRUN_A (1<<0) +#define ERR_INT_FIFO_UNDERRUN(pipe) (1<<(pipe*3)) #define FPGA_DBG 0x42300 #define FPGA_DBG_RM_NOCLAIM (1<<31)