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 Cc: stable at vger.kernel.org Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com> --- drivers/gpu/drm/i915/intel_display.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d75c6a0..9b5f0fb 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3656,6 +3656,15 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc) intel_disable_plane(dev_priv, plane, pipe); intel_disable_pipe(dev_priv, pipe); + + if (!HAS_PCH_SPLIT(dev)) { + const u32 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; -- 1.7.9.5
