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drm/i915: disable shared panel fitter for pipe

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commit 24a1f16de9 upstream.

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
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mika Kuoppala 2013-02-08 16:35:37 +02:00 committed by Greg Kroah-Hartman
parent df87bd32f9
commit 6bdf87562c
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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@ -3303,6 +3303,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
int pipe = intel_crtc->pipe;
int plane = intel_crtc->plane;
u32 pctl;
if (!intel_crtc->active)
return;
@ -3318,6 +3319,13 @@ 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;