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* [PATCH] drm/i915: Check for driver readyness before handling an underrun interrupt
@ 2015-02-26 15:53 Chris Wilson
  2015-02-27  7:52 ` [Intel-gfx] " Jani Nikula
  2015-02-28 19:16 ` shuang.he
  0 siblings, 2 replies; 7+ messages in thread
From: Chris Wilson @ 2015-02-26 15:53 UTC (permalink / raw)
  To: intel-gfx; +Cc: daniel.vetter, rclark, Chris Wilson, stable

When we takeover from the BIOS and install our interrupt handler, the
BIOS may have left us a few surprises in the form of spontaneous
interrupts. (This is especially likely on hardware like 965gm where
display fifo underruns are continuous and the GMCH cannot filter that
interrupt souce.) As we enable our IRQ early so that we can use it
during hardware probing, our interrupt handler must be prepared to
handle a few sources prior to being fully configured. As such, we need
to add a simple is-ready check prior to dereferencing our KMS state for
reporting underruns.

Reported-by: Rob Clark <rclark@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1193972
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
---
 drivers/gpu/drm/i915/intel_fifo_underrun.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_fifo_underrun.c b/drivers/gpu/drm/i915/intel_fifo_underrun.c
index 04e248dd2259..f2fd992e3cd8 100644
--- a/drivers/gpu/drm/i915/intel_fifo_underrun.c
+++ b/drivers/gpu/drm/i915/intel_fifo_underrun.c
@@ -282,16 +282,6 @@ bool intel_set_cpu_fifo_underrun_reporting(struct drm_i915_private *dev_priv,
 	return ret;
 }
 
-static bool
-__cpu_fifo_underrun_reporting_enabled(struct drm_i915_private *dev_priv,
-				      enum pipe pipe)
-{
-	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 - set PCH fifo underrun reporting state
  * @dev_priv: i915 device instance
@@ -352,9 +342,15 @@ bool intel_set_pch_fifo_underrun_reporting(struct drm_i915_private *dev_priv,
 void intel_cpu_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv,
 					 enum pipe pipe)
 {
+	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
+
+	/* We may be called too early in init, thanks BIOS! */
+	if (crtc == NULL)
+		return;
+
 	/* GMCH can't disable fifo underruns, filter them. */
 	if (HAS_GMCH_DISPLAY(dev_priv->dev) &&
-	    !__cpu_fifo_underrun_reporting_enabled(dev_priv, pipe))
+	    !to_intel_crtc(crtc)->cpu_fifo_underrun_disabled)
 		return;
 
 	if (intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false))
-- 
2.1.4

^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2015-02-28 19:16 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-02-26 15:53 [PATCH] drm/i915: Check for driver readyness before handling an underrun interrupt Chris Wilson
2015-02-27  7:52 ` [Intel-gfx] " Jani Nikula
2015-02-27  8:20   ` Jani Nikula
2015-02-27  9:27     ` Chris Wilson
2015-02-27  9:53       ` Jani Nikula
2015-02-27 14:24       ` Daniel Vetter
2015-02-28 19:16 ` shuang.he

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