From: "André Almeida" <andrealmeid@igalia.com>
To: "Michel Dänzer" <michel.daenzer@mailbox.org>
Cc: pierre-eric.pelloux-prayer@amd.com,
"Pekka Paalanen" <pekka.paalanen@collabora.com>,
kernel-dev@igalia.com, "'Marek Olšák'" <maraeo@gmail.com>,
"Randy Dunlap" <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
wayland-devel@lists.freedesktop.org,
"Pekka Paalanen" <ppaalanen@gmail.com>,
dri-devel@lists.freedesktop.org, alexander.deucher@amd.com,
joshua@froggi.es, hwentlan@amd.com, christian.koenig@amd.com
Subject: Re: [PATCH v6 6/6] drm/doc: Define KMS atomic state set
Date: Mon, 21 Aug 2023 17:02:19 -0300 [thread overview]
Message-ID: <d36ba832-3100-4a31-96a4-56e6e459b090@igalia.com> (raw)
In-Reply-To: <1b23576d-1649-ff5c-6273-b54729ea46d8@mailbox.org>
Hi Michel,
Em 17/08/2023 07:37, Michel Dänzer escreveu:
> On 8/15/23 20:57, André Almeida wrote:
>> From: Pekka Paalanen <pekka.paalanen@collabora.com>
>>
>> Specify how the atomic state is maintained between userspace and
>> kernel, plus the special case for async flips.
>>
>> Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
>> Signed-off-by: André Almeida <andrealmeid@igalia.com>
>
> [...]
>
>> +An atomic commit with the flag DRM_MODE_PAGE_FLIP_ASYNC is allowed to
>> +effectively change only the FB_ID property on any planes. No-operation changes
>> +are ignored as always. [...]
>
> During the hackfest in Brno, it was mentioned that a commit which re-sets the same FB_ID could actually have an effect with VRR: It could trigger scanout of the next frame before vertical blank has reached its maximum duration. Some kind of mechanism is required for this in order to allow user space to perform low frame rate compensation.
>
I believe the documentation already addresses that sending redundant
information may not lead to the desired behavior during an async flip.
Do you think adding a note about using the same FB_ID would be helpful?
next prev parent reply other threads:[~2023-08-21 20:02 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-15 18:57 [PATCH v6 0/6] drm: Add support for atomic async page-flip André Almeida
2023-08-15 18:57 ` [PATCH v6 1/6] drm: allow DRM_MODE_PAGE_FLIP_ASYNC for atomic commits André Almeida
2023-08-15 18:57 ` [PATCH v6 2/6] drm: introduce DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP André Almeida
2023-08-15 18:57 ` [PATCH v6 3/6] drm: introduce drm_mode_config.atomic_async_page_flip_not_supported André Almeida
2023-08-15 18:57 ` [PATCH v6 4/6] amd/display: indicate support for atomic async page-flips on DC André Almeida
2023-08-15 18:57 ` [PATCH v6 5/6] drm: Refuse to async flip with atomic prop changes André Almeida
2023-08-22 9:55 ` Sebastian Wick
2023-10-15 15:37 ` Simon Ser
2023-08-15 18:57 ` [PATCH v6 6/6] drm/doc: Define KMS atomic state set André Almeida
2023-08-17 10:37 ` Michel Dänzer
2023-08-17 10:48 ` Michel Dänzer
2023-08-21 20:02 ` André Almeida [this message]
2023-08-22 10:03 ` Michel Dänzer
2023-10-16 10:52 ` André Almeida
2023-10-16 12:18 ` Pekka Paalanen
2023-10-16 13:42 ` André Almeida
2023-10-16 14:52 ` Pekka Paalanen
2023-10-16 15:01 ` André Almeida
2023-10-16 15:10 ` Ville Syrjälä
2023-10-16 22:00 ` Simon Ser
2023-10-17 12:10 ` Ville Syrjälä
2023-10-23 8:25 ` Simon Ser
2023-11-13 9:18 ` Simon Ser
2023-11-13 9:38 ` Pekka Paalanen
2023-11-13 9:44 ` Simon Ser
2023-11-13 10:15 ` Pekka Paalanen
2023-11-13 10:18 ` Simon Ser
2023-11-13 9:41 ` Michel Dänzer
2023-11-13 9:47 ` Simon Ser
2023-11-13 9:53 ` Michel Dänzer
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