[Intel-gfx] [PATCH] drm/i915: fix up ivb plane 3 pageflips

[Eugeni Dodonov]

On 06/05/2012 05:56 AM, Daniel Vetter wrote:
> On Wed, May 23, 2012 at 02:02:00PM +0200, Daniel Vetter wrote:
>> Or at least plug another gapping hole. Apparrently hw desingers only
>> moved the bit field, but did not bother ot re-enumerate the planes
>> when adding support for a 3rd pipe.
>>
>> Discovered by i-g-t/flip_test.
>>
>> This may or may not fix the reference bugzilla, because that one
>> smells like we have still larger fish to fry.
>>
>> v2: Fixup the impossible case to catch programming errors, noticed by
>> Chris Wilson.
>>
>> References: https://bugs.freedesktop.org/show_bug.cgi?id=50069
>> Signed-Off-by: Daniel Vetter<daniel.vetter at ffwll.ch>
>
> Ping for review and maybe a tested-by. This fixes i-g-t/tests/flip_test on
> my ivb, but for some strange reasons QA can't confirm that. Still, I'd
> like to push this patch to -fixes. Eugeni, Ben?

Although I don't get exact symptoms (I don't get any BUG in dmesg), 
without this patch the flip_test hangs when running on 3rd pipe, and 
with this patch it proceeds and finishes correctly.

So this patch fixes this test case, and as far I can see it is correct.

Tested-by: Eugeni Dodonov <eugeni.dodonov at intel.com>

Eugeni