This regression has been introduced in
commit 9f11a9e4e50006b615ba94722dfc33ced89664cf
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Thu Jun 13 00:54:58 2013 +0200
drm/i915: set up PIPECONF explicitly for i9xx/vlv platforms
Ville brough up the idea that this is just the pipe A quirk gone
wrong.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66462
References: https://lkml.org/lkml/2013/8/26/238
Cc: Meelis Roos <mroos@xxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f7d868e..be97b42 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4833,7 +4833,11 @@ static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t pipeconf;
- pipeconf = 0;
+ if (dev_priv->quirks & QUIRK_PIPEA_FORCE) {
+ pipeconf =
+ I915_READ(PIPECONF(intel_crtc->pipe)) & PIPECONF_ENABLE;
+ } else
+ pipeconf = 0;
if (intel_crtc->config.double_wide)
pipeconf |= PIPECONF_DOUBLE_WIDE;
--
1.8.4.rc3
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