[PATCH 104/139] drm/i915: disable shared panel fitter for pipe

Luis Henriques luis.henriques at canonical.com
Thu Feb 28 14:44:14 UTC 2013 -stable review patch.  If anyone has any objections, please let me know.


From: Mika Kuoppala <mika.kuoppala at linux.intel.com>

commit 24a1f16de97c4cf0029d9acd04be06db32208726 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 at chris-wilson.co.uk>

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58867
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
Tested-by: Andreas Sturmlechner <andreas.sturmlechner at gmail.com>
[danvet: Remove the redundant HAS_PCH_SPLIT check and add a tiny
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
[ luis: adjust context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 drivers/gpu/drm/i915/intel_display.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b61bc50..bff2719 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3226,6 +3226,7 @@ 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)
@@ -3241,6 +3242,13 @@ 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)
 	intel_disable_pll(dev_priv, pipe);
 	intel_crtc->active = false;

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