[Intel-gfx] [PATCH 1/2] drm/i915: disable shared panel fitter for pipe

[Daniel Vetter]

On Fri, Feb 8, 2013 at 3:35 PM, Mika Kuoppala
<mika.kuoppala at linux.intel.com> wrote:
> 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

Tested-by from the reporter is missing.

> 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)) {

This is always true in i9xx_crtc_disable, so you can remove this indentation.
-Daniel

> +               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
>
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch