From: Ville Syrjälä <ville.syrj...@linux.intel.com>
i830_disable_pipe() gets called from the power well code, and thus
we're already holding the power domain mutex. That means we can't
call plane->get_hw_state() as it will also try to grab the
same mutex and will thus deadlock.
Replace the assert_plane() calls (which calls ->get_hw_state()) with
just raw register reads in i830_disable_pipe(). As a bonus we can
now get a warning if plane C is enabled even though we don't even
expose it as a drm plane.
Fixes: 51f5a0963984 ("drm/i915: Add .get_hw_state() method for planes")
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index d67c7c498b34..48d9332b196f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14731,8 +14731,11 @@ void i830_disable_pipe(struct drm_i915_private
*dev_priv, enum pipe pipe)
DRM_DEBUG_KMS("disabling pipe %c due to force quirk\n",
pipe_name(pipe));
- assert_planes_disabled(intel_get_crtc_for_pipe(dev_priv, PIPE_A));
- assert_planes_disabled(intel_get_crtc_for_pipe(dev_priv, PIPE_B));
+ WARN_ON(I915_READ(DSPCNTR(PLANE_A)) & DISPLAY_PLANE_ENABLE ||
+ I915_READ(DSPCNTR(PLANE_B)) & DISPLAY_PLANE_ENABLE ||
+ I915_READ(DSPCNTR(PLANE_C)) & DISPLAY_PLANE_ENABLE ||
+ I915_READ(CURCNTR(PIPE_A)) & CURSOR_MODE ||
+ I915_READ(CURCNTR(PIPE_B)) & CURSOR_MODE);
I915_WRITE(PIPECONF(pipe), 0);
POSTING_READ(PIPECONF(pipe));
--
2.13.6
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