linux-kernel - Re: [PATCH v2 6/6] drm: Add helper for simple display pipeline

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Date:	Thu, 12 May 2016 12:18:21 +0200
From:	Noralf Trønnes <noralf@...nnes.org>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] drm: Add helper for simple display pipeline

Den 12.05.2016 10:11, skrev Daniel Vetter:
> On Wed, May 11, 2016 at 07:09:10PM +0200, Daniel Vetter wrote:
>> On Wed, May 11, 2016 at 06:09:22PM +0200, Noralf Trønnes wrote:
>>> +/**
>>> + * drm_simple_display_pipe_init - Initialize a simple display pipeline
>>> + * @dev: DRM device
>>> + * @pipe: simple display pipe object to initialize
>>> + * @funcs: callbacks for the display pipe (optional)
>>> + * @formats: array of supported formats (%DRM_FORMAT_*)
>>> + * @format_count: number of elements in @formats
>>> + * @connector: connector to attach and register
>>> + *
>>> + * Sets up a display pipeline which consist of a really simple
>>> + * plane-crtc-encoder pipe coupled with the provided connector.
>> How are drivers supposed to release this stuff again? Maybe add:
>>
>> "Teardown of a simple display pipe is all handled automatically by the drm
>> core through calling drm_mode_config_cleanup()."
> Thought a bit more about this, maybe we should also add "Drivers
> afterwards need to release the memory for the structure themselves."
>
> Btw one other thing I realized is that there's no atomic_commit for this.
> How do you plane to implement async commit? No need to address this right
> away, we can discuss it when you've rebased tinydrm and submit that for
> review.
> -Daniel

I don't follow you here. Isn't this atomic_commit:

drm_atomic_helper_commit => drm_atomic_helper_commit_planes =>
drm_simple_kms_plane_atomic_update => pipe->funcs->update

Noralf.