linux-kernel - Re: [RFC PATCH 1/3] atmel-hlcdc: add support for 8-bit color lookup table mode

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Message-ID: <88384c85-6115-6833-663c-6e9ca802d867@axentia.se>
Date:   Sat, 17 Jun 2017 00:46:12 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC PATCH 1/3] atmel-hlcdc: add support for 8-bit color lookup
 table mode

>>>> Hm, it's probably too late to do it here. Planes have already been
>>>> enabled and the engine may have started to fetch data and do the
>>>> composition. You could do that in ->update_plane() [1], and make it a
>>>> per-plane thing.
>>>>
>>>> I'm not sure, but I think you can get the new crtc_state from
>>>> plane->crtc->state in this context (state have already been swapped,
>>>> and new state is being applied, which means relevant locks are held).  
>>>
>>> Ok, I can move it there. My plan is to just copy the default .update_plane
>>> function and insert 
>>>
>>> 	if (crtc->state->color_mgmt_changed && crtc->state->gamma_lut) {
>>> 		...
>>> 	}
>>>
>>> just before the drm_atomic_commit(state) call. Sounds ok?
>>
>> Why would you copy the default ->update_plane() when we already have
>> our own ->atomic_update_plane() implementation [1]? Just put it there
>> (before the atmel_hlcdc_layer_update_commit() call) and we should be
>> good.
> 
> Ahh, but you said ->update_plane() and I took that as .update_plane in
> layer_plane_funcs, not ->atomic_update() in atmel_hlcdc_layer_plane_helper_funcs.
> 
> Makes sense now, and much neater too.

No, it doesn't make sense. There's no atmel_hlcdc_layer_update_commit call
anywhere, and no such function. You seem to have some further changes that
are not even in -next. Where am I getting those changes and why are they
not upstream yet?

There's a mention of the missing function here [1], but that's some 18
months ago. What's going on?

[1] https://patchwork.kernel.org/patch/7965721/

Cheers,
peda