On 2026-01-28 23:43, Derek John Clark wrote:
>> From: Leo Li <[email protected]>
>>
>> Some drivers need to perform sleepable operations prior to enabling
>> vblank interrupts. A display hardware spin-up from a low-power state
>> that requires synchronization with the rest of the driver, for example.
>>
>> To support this, introduce a DRM-internal drm_crtc_vblank_prepare()
>> helper that calls back into the driver -- if implemented -- for DRM to
>> do such preparation work before enabling vblank.
>>
>> v3:
>> * Unexport drm_crtc_vblank_prepare() and make it DRM internal
>> * Drop warnings in drm core for vblank_prepare(), drivers can do so in
>> their implementations
>> * Drop unnecessary crtc null checks
>> * Check for drm_dev_has_vblank()
>> * Rebase on latest drm-misc-next
>>
>> v4:
>> * EXPORT function to fix build error on DRM_KMS_HELPER=m
>>
>> Signed-off-by: Leo Li <[email protected]>
>
> Hi Leo.
>
> I wanted to know what branch this series applies to. I'm trying to
> troubleshoot a possible vblank issue on the Legion Go 2 and was
> pointed towards this patch series. Unfortunately I can't get it to
> apply cleanly to drm/drm-fixes, drm/drm-next or stable/linux-6.18.y
Hi Derek,
This applies to drm-misc-next, here:
https://gitlab.freedesktop.org/drm/misc/kernel/-/tree/drm-misc-next
Thanks,
Leo
>
>
> From commit 15392f76405ecb953216b437bed76ffa49cefb7b (HEAD,
> drm/drm-next, drm/HEAD):
> $ b4 shazam
> https://lore.kernel.org/dri-devel/[email protected]/
> Grabbing thread from
> lore.kernel.org/all/[email protected]/t.mbox.gz
> Checking for newer revisions
> Grabbing search results from lore.kernel.org
> Analyzing 2 messages in the thread
> Analyzing 0 code-review messages
> Checking attestation on all messages, may take a moment...
> ---
> [PATCH v4 1/2] drm: Introduce drm_crtc_vblank_prepare()
> [PATCH v4 2/2] drm/amd/display: Implement prepare_vblank_enable callback
> ---
> NOTE: install dkimpy for DKIM signature verification
> ---
> Total patches: 2
> ---
> Applying: drm: Introduce drm_crtc_vblank_prepare()
> Applying: drm/amd/display: Implement prepare_vblank_enable callback
> Patch failed at 0002 drm/amd/display: Implement prepare_vblank_enable callback
> error: patch failed:
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c:277
> error: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c: patch
> does not apply
>
>
> Thanks,
> Derek
