Re: [PATCH] drm/i915/skl: Support Y tiling in MMIO flips

From: "Jindal, Sonika" <sonika.jindal@intel.com>
To: Daniel Vetter <daniel@ffwll.ch>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	"Intel-gfx@lists.freedesktop.org"
	<Intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH] drm/i915/skl: Support Y tiling in MMIO flips
Date: Tue, 21 Apr 2015 10:25:21 +0530	[thread overview]
Message-ID: <5535D839.2040006@intel.com> (raw)
In-Reply-To: <20150420174418.GL14565@bremse>


On 4/20/2015 11:14 PM, Daniel Vetter wrote:
> On Mon, Apr 20, 2015 at 05:38:20PM +0100, Tvrtko Ursulin wrote:
>>
>> On 04/20/2015 05:22 PM, Daniel Vetter wrote:
>>> On Mon, Apr 20, 2015 at 04:22:48PM +0100, Tvrtko Ursulin wrote:
>>>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>>>
>>>> Add Y tiling support to skl_do_mmio_flip.
>>>>
>>>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>>> Cc: Damien Lespiau <damien.lespiau@intel.com>
>>>> Cc: Sonika Jindal <sonika.jindal@intel.com>
>>>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>>>> ---
>>>> Looks like we completely missed this completely parallel instance of plane
>>>> programming code when working on Y tiling support!
>>>>
>>>> Will rotation need supporting here as well?
>>>
>>> Oh dear this is a bit ugly. We definitely need either this for 4.1 or take
>>> out the Y-tiling support for 4.1. Rotation only made 4.2, so I think
>>> we're good, but we do indeed need to take rotation into account here too.
>>
>> What is ugly, this patch or the overall situation?
>>
>>> And it seems like we also need a pile of igt testcases to make sure
>>> Y-tiling, rotation (even 180 probably) works correctly with pageflips. Yay
>>> for kms_flip growing even more.
>>
>> I added Y to kms_flip_tiling back then - but both that one and kms_flip
>> don't do any pipe crc. So not much use in automated fashion. And testdisplay
>> apparently does not hit this path.
>>
>> I did not have working crc hw back then, maybe that has changed, I'll check
>> it and then, depending on the outcome, see if I can add something automated.
>>
>> Either way, adding this fix sounds better than reverting everything.
>
> On 2nd thought skl is still tagged as preliminary, so we don't have any
> issues here at all. Queued for -next, thanks for the patch.
>
> While looking at skl_do_mmio_flip I noticed though that rotation support
> seems to be completely absent. Or did I miss something?
Yes, it doesn't exist.
Is it because of it being temporary as per the following comment:
"/*
  * XXX: This is the temporary way to update the plane registers until 
we get
  * around to using the usual plane update functions for MMIO flips
  */
"

> -Daniel
>
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