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drm/i915: disable shared panel fitter for pipe

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If encoder is switched off by BIOS, but the panel fitter is left on,
we never try to turn off the panel fitter and leave it still attached
to the pipe - which can cause blurry output elsewhere.

Based on work by Chris Wilson <chris@chris-wilson.co.uk>

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58867
Cc: stable@vger.kernel.org
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Tested-by: Andreas Sturmlechner <andreas.sturmlechner@gmail.com>
[danvet: Remove the redundant HAS_PCH_SPLIT check and add a tiny
comment.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2013-02-08 16:35:37 +02:00 committed by Daniel Vetter
parent 1d7aaa0cfe
commit 24a1f16de9
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/intel_display.c
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@ -3637,6 +3637,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
struct intel_encoder *encoder;
int pipe = intel_crtc->pipe;
int plane = intel_crtc->plane;
u32 pctl;
if (!intel_crtc->active)
@ -3656,6 +3657,13 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
intel_disable_plane(dev_priv, plane, pipe);
intel_disable_pipe(dev_priv, pipe);
/* Disable pannel fitter if it is on this pipe. */
pctl = I915_READ(PFIT_CONTROL);
if ((pctl & PFIT_ENABLE) &&
((pctl & PFIT_PIPE_MASK) >> PFIT_PIPE_SHIFT) == pipe)
I915_WRITE(PFIT_CONTROL, 0);
intel_disable_pll(dev_priv, pipe);
intel_crtc->active = false;