linux-kernel - Re: [PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc

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Date:   Mon, 2 Oct 2023 16:19:56 +0200
From:   Michel Dänzer <michel.daenzer@...lbox.org>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     Stylon Wang <stylon.wang@....com>, Ivan Lipski <ivlipski@....com>,
        Leo Li <sunpeng.li@....com>, David Airlie <airlied@...il.com>,
        Qingqing Zhuo <Qingqing.Zhuo@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Alex Hung <alex.hung@....com>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Hersen Wu <hersenxs.wu@....com>, amd-gfx@...ts.freedesktop.org,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <wayne.lin@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
        Harry Wentland <harry.wentland@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH] Revert "drm/amd/display: Check all enabled planes in
 dm_check_crtc_cursor"

On 10/2/23 12:48, Michel Dänzer wrote:
> On 10/2/23 12:05, Michel Dänzer wrote:
>> On 9/29/23 22:41, Hamza Mahfooz wrote:
>>> From: Ivan Lipski <ivlipski@....com>
>>>
>>> This reverts commit 45e1ade04b4d60fe5df859076005779f27c4c9be.
>>>
>>> Since, it causes the following IGT tests to fail:
>>> kms_cursor_legacy@...sor-vs-flip.*
>>> kms_cursor_legacy@...p-vs-cursor.*
>>
>> Any information about how those tests fail? Maybe they accidentally rely on the broken behaviour?
> 
> I was able to reproduce, that doesn't seem to be the case. They just rely on multiple legacy cursor ioctl calls being able to complete between consecutive flips, which I suppose is broken by always pulling in non-cursor plane state with any cursor plane state changes.
> 
> I'll see if I can find a better solution. Meanwhile,
> 
> Acked-by: Michel Dänzer <mdaenzer@...hat.com>
> 
> for the revert.

Alternatively, here's an incremental fix:

https://patchwork.freedesktop.org/series/124527/


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer