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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-09-24 11:46:14 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-09-24 20:39:00 +0200 |
| commit | 67c72a12254101d4e8d9b9f3a02646ba0be84a2d (patch) | |
| tree | a16e4487640a3901ea27166ca0cce3d689adc5eb /drivers/gpu | |
| parent | 1062b81598bc00e2f6620e6f3788f8f8df2f01e7 (diff) | |
| download | linux-67c72a12254101d4e8d9b9f3a02646ba0be84a2d.tar.bz2 | |
drm/i915: preserve pipe A quirk in i9xx_set_pipeconf
This regression has been introduced in
commit 9f11a9e4e50006b615ba94722dfc33ced89664cf
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
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.
Note that after resume the bios might or might not have enabled pipe A
already. We have a bit of magic to make sure that on resume we set up
a decent mode for pipe A, but I fear if I just smash pipe A to always
on we'd enable it in a bogus state and hang the hw. Hence the
readback.
v2: Clarify the logic a bit as suggested by Chris. Also amend the
commit message to clarify why we don't unconditionally enable the
pipe.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66462
References: https://lkml.org/lkml/2013/8/26/238
Cc: Meelis Roos <mroos@ut.ee>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Use |= instead of = as suggested by Chris.]
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d8a1d98693e7..e5822e79f912 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4775,6 +4775,10 @@ static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc) pipeconf = 0; + if (dev_priv->quirks & QUIRK_PIPEA_FORCE && + I915_READ(PIPECONF(intel_crtc->pipe)) & PIPECONF_ENABLE) + pipeconf |= PIPECONF_ENABLE; + if (intel_crtc->pipe == 0 && INTEL_INFO(dev)->gen < 4) { /* Enable pixel doubling when the dot clock is > 90% of the (display) * core speed. |