linux-kernel - Re: [PATCH 0/3] drm/meson: Add support for Overlay and OSD Plane scaling

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Message-ID: <c991c4cc-317c-19e7-a106-ce675f239559@baylibre.com>
Date:   Tue, 6 Nov 2018 14:36:56 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/3] drm/meson: Add support for Overlay and OSD Plane
 scaling

Hi Daniel,

On 06/11/2018 12:13, Daniel Vetter wrote:
> On Tue, Nov 06, 2018 at 10:39:59AM +0100, Neil Armstrong wrote:
>> This serie adds support for :
>> - Overlay Plane blended with the primary plane, we can describe as "behind"
>> - Primary Plane up-scaling up to 5x factor to support the OSD plane being
>>   upscaled from 1920x1080 when the display mode is set as 3840x2160.
>>
>> These patches depends on the "drm/meson: Allow using optional canvas provider"
>> patchset from Maxime Jourdan at [1]
>>
>> [1] https://patchwork.kernel.org/project/linux-amlogic/list/?series=38355
>>
>> Neil Armstrong (3):
>>   drm/meson: Support Overlay plane for video rendering
>>   drm/meson: move OSD scaler management into plane atomic update
>>   drm/meson: Add primary plane scaling
> 
> Got bored, read a bit your patch series. Two things I've noticed:

Great you got bored today !

> - We need to drop the crtc_state argument from
>   drm_atomic_helper_check_plane_state(), some drivers (not meson) do
>   really funny stuff with this.

Should drm_atomic_get_crtc_state() be integrated into drm_atomic_helper_check_plane_state() ?

> 
> - I think your osd1_commit = true update is racy with the interrupt
>   handler checking it. Needs at least a few memory barriers. Since helpers
>   guarantee that you can't overtake a preceending update (you do the
>   vblank handling after the updating) that should be ok, except you arm
>   the vblank before setting up registers, so this might race too.

Yeah, I need to do a cleanup of this at some point...

> 
> Anyway all unrelated, so feel free to smash an
> 
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> on the entire series.

thanks !

Will push to drm-misc-next once the branch is ready.

Neil

> 
> Cheers, Daniel
> 
>>
>>  drivers/gpu/drm/meson/Makefile          |   2 +-
>>  drivers/gpu/drm/meson/meson_canvas.c    |   7 +-
>>  drivers/gpu/drm/meson/meson_canvas.h    |  11 +-
>>  drivers/gpu/drm/meson/meson_crtc.c      | 251 +++++++++++++-
>>  drivers/gpu/drm/meson/meson_drv.c       |  29 +-
>>  drivers/gpu/drm/meson/meson_drv.h       |  62 ++++
>>  drivers/gpu/drm/meson/meson_overlay.c   | 586 ++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/meson/meson_overlay.h   |  14 +
>>  drivers/gpu/drm/meson/meson_plane.c     | 177 ++++++++--
>>  drivers/gpu/drm/meson/meson_registers.h |   3 +
>>  drivers/gpu/drm/meson/meson_viu.c       |  15 +
>>  drivers/gpu/drm/meson/meson_vpp.c       |  90 +++--
>>  12 files changed, 1156 insertions(+), 91 deletions(-)
>>  create mode 100644 drivers/gpu/drm/meson/meson_overlay.c
>>  create mode 100644 drivers/gpu/drm/meson/meson_overlay.h
>>
>> -- 
>> 2.7.4
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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