[Intel-gfx] [PATCH] drm/i915: Fix all pipe->plane mappings before sanitizing crtc

[Chris Wilson]

On Wed, Jan 14, 2015 at 12:50:46PM +0200, Ander Conselvan de Oliveira wrote:
> On 01/14/2015 12:47 PM, Jani Nikula wrote:
> >On Tue, 13 Jan 2015, Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com> wrote:
> >>If QUIRK_PIPEA_FORCE is necessary, intel_sanitize_crtc() might trigger
> >>a mode set. In that case, if pipe A is disabled and pipe B is mapped to
> >>plane B, that mode set happens before the mapping is fixed. Due to the
> >>wrong state, the call to disable pipe B disables plane A (which is
> >>already disabled) and later an assertion for plane B being enabled
> >>(while it should have been disabled) is triggered.
> >>
> >>References: https://bugs.freedesktop.org/show_bug.cgi?id=72782
> >
> >If the patch is expected to fix the bug, please use Bugzilla:. If you're
> >referencing a bug because it's otherwise relevant, please use
> >References:.
> >
> >Which one is this?
> 
> This showed up in the dmesg attached to the referenced bug, but is
> not the root cause of the reported problem. As far as I know, there
> is no open bug for this particular issue.

But that machine should not be using QUIRK_PIPEA_FORCE... What I expect
is happening is that the BIOS sets up the LVDS on the "wrong" pipe.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre