From: Hamza Mahfooz <someguy@effective-light.com>
To: "Christian König" <christian.koenig@amd.com>
Cc: dri-devel@lists.freedesktop.org,
"Alex Deucher" <alexander.deucher@amd.com>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
"Rodrigo Siqueira" <siqueira@igalia.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Sunil Khatri" <sunil.khatri@amd.com>,
"Ce Sun" <cesun102@amd.com>, "Lijo Lazar" <lijo.lazar@amd.com>,
"Kenneth Feng" <kenneth.feng@amd.com>,
"Ivan Lipski" <ivan.lipski@amd.com>,
"Alex Hung" <alex.hung@amd.com>,
"Tom Chung" <chiahsuan.chung@amd.com>,
"Melissa Wen" <mwen@igalia.com>,
"Michel Dänzer" <mdaenzer@redhat.com>,
"Fangzhi Zuo" <Jerry.Zuo@amd.com>,
"Timur Kristóf" <timur.kristof@gmail.com>,
amd-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] drm: introduce page_flip_timeout()
Date: Fri, 23 Jan 2026 09:44:21 -0500 [thread overview]
Message-ID: <aXOJRWALUJLcGWqh@hal-station.localdomain> (raw)
In-Reply-To: <2de6d428-b997-4ba8-8766-a211e5612e72@amd.com>
On Fri, Jan 23, 2026 at 02:52:44PM +0100, Christian König wrote:
> I can only see two reasons why you could run into a timeout:
>
> 1. A dma_fence never signals.
> How that should be handled is already well documented and doesn't require any of this.
>
> 2. A coding error in the vblank or page flip handler leading to waiting forever.
> In that case calling back into the driver doesn't help either.
>
> So as far as I can see the whole approach doesn't make any sense at all.
It appears that resetting display firmware is able to put at least a
subset of these systems back into a consistent (usable) state. Though, I
don't have a reliable way to reproduce the issue that I'm seeing so I
can't say for sure what it boils down to.
next prev parent reply other threads:[~2026-01-23 14:44 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-23 0:05 Hamza Mahfooz
2026-01-23 0:05 ` [PATCH 2/2] drm/amdgpu: implement page_flip_timeout() support Hamza Mahfooz
2026-01-23 11:20 ` Timur Kristóf
2026-01-23 14:25 ` Hamza Mahfooz
2026-01-23 12:26 ` kernel test robot
2026-01-23 15:16 ` kernel test robot
2026-01-23 17:49 ` Alex Deucher
2026-01-23 18:10 ` Alex Deucher
2026-01-23 13:52 ` [PATCH 1/2] drm: introduce page_flip_timeout() Christian König
2026-01-23 14:44 ` Hamza Mahfooz [this message]
2026-01-23 16:12 ` Christian König
2026-01-23 19:41 ` Alex Deucher
2026-01-23 14:44 ` Timur Kristóf
2026-01-23 22:30 ` Mario Limonciello
2026-01-24 18:32 ` Hamza Mahfooz
2026-01-24 18:43 ` Mario Limonciello
2026-01-24 19:49 ` Hamza Mahfooz
2026-01-27 22:44 ` Hamza Mahfooz
2026-01-26 14:20 ` Alex Deucher
2026-01-27 22:52 ` Hamza Mahfooz
2026-01-27 22:57 ` Alex Deucher
2026-01-28 10:39 ` Christian König
2026-01-28 11:26 ` Michel Dänzer
2026-01-28 12:14 ` Timur Kristóf
2026-01-28 12:48 ` Christian König
2026-01-28 14:25 ` Michel Dänzer
2026-01-29 10:06 ` Michel Dänzer
2026-01-29 11:25 ` Timur Kristóf
2026-01-29 11:38 ` Christian König
2026-01-29 12:06 ` Timur Kristóf
2026-01-29 12:59 ` Christian König
2026-01-29 14:04 ` Hamza Mahfooz
2026-01-29 14:24 ` Christian König
2026-01-29 14:33 ` Hamza Mahfooz
2026-01-29 14:41 ` Christian König
2026-02-03 21:48 ` Timur Kristóf
2026-01-29 21:56 ` Xaver Hugl
2026-01-26 10:14 ` Christian König
2026-01-26 10:27 ` Michel Dänzer
2026-01-26 13:00 ` Christian König
2026-01-26 14:31 ` Michel Dänzer
2026-01-28 9:19 ` Timur Kristóf
2026-01-28 11:25 ` Christian König
2026-01-28 12:22 ` Timur Kristóf
2026-01-28 14:25 ` Michel Dänzer
2026-01-28 14:35 ` Christian König
2026-01-29 21:39 ` Xaver Hugl
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