linux-kernel - Re: [PATCH 0/2] drm/meson: Allow using optional canvas provider

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Message-ID: <ec49e7c1-8ca6-b442-10dc-1f15a15917bc@baylibre.com>
Date:   Tue, 13 Nov 2018 14:32:36 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Maxime Jourdan <mjourdan@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 0/2] drm/meson: Allow using optional canvas provider

On 05/11/2018 15:02, Maxime Jourdan wrote:
> Hi Neil,
> 
> On Mon, Nov 5, 2018 at 1:51 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Hi Maxime,
>>
>> On 05/11/2018 11:45, Maxime Jourdan wrote:
>>> The meson DRM driver currently uses constant, static canvas indexes.
>>>
>>> This is not optimal and could conflict with other drivers also using
>>> canvases.
>>
>> Indeed, it's now time to use the canvas provider merged in 4.20-rc1 !
>>
>>>
>>> This patch series allows the driver to optionnally use a canvas provider
>>> module that is able to dispatch canvases, on demand and free of conflict.
>>>
>>> In the future, the current way of doing things will be deprecated.
>>
>> Do you confirm you will send a patch to remove the legacy canvas code when
>> everything is merged (including DT changes) ?
>>
>> I'll wait until the bindings are reviewed, then I'll push the serie to drm-misc-next.
>>
> 
> Yes, ultimately it will be removed.
> 
> The plan is:
> 
> 4.21: allow using both modes, add the "amlogic,canvas" property to the dts files
> 4.22: remove the old way and change the amlogic,canvas property to mandatory
> 
> This should allow for a nice transition.
> 
> Maxime
> 
>> Thanks,
>> Neil
>>
>>>
>>> Maxime Jourdan (2):
>>>   dt-bindings: display: amlogic, meson-vpu: Add optional canvas provider
>>>     node
>>>   drm/meson: Use optional canvas provider
>>>
>>>  .../bindings/display/amlogic,meson-vpu.txt    |  2 +
>>>  drivers/gpu/drm/meson/Kconfig                 |  1 +
>>>  drivers/gpu/drm/meson/meson_crtc.c            | 14 ++++--
>>>  drivers/gpu/drm/meson/meson_drv.c             | 46 ++++++++++++-------
>>>  drivers/gpu/drm/meson/meson_drv.h             |  4 ++
>>>  drivers/gpu/drm/meson/meson_plane.c           |  8 +++-
>>>  6 files changed, 53 insertions(+), 22 deletions(-)
>>>

Applied