linux-kernel - Re: [RFC PATCH v5 0/3] Add support modifiers for drivers whose planes only support linear layout

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Message-ID: <YfJt7zQNUnSpMP+l@phenom.ffwll.local>
Date:   Thu, 27 Jan 2022 11:03:27 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Tomohito Esaki <etom@...l.co.jp>
Cc:     dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Ben Skeggs <bskeggs@...hat.com>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Simon Ser <contact@...rsion.fr>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Mark Yacoub <markyacoub@...omium.org>,
        Sean Paul <seanpaul@...omium.org>,
        Evan Quan <evan.quan@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        nouveau@...ts.freedesktop.org, Daniel Stone <daniel@...ishbar.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Damian Hobson-Garcia <dhobsong@...l.co.jp>,
        Takanari Hayama <taki@...l.co.jp>
Subject: Re: [RFC PATCH v5 0/3] Add support modifiers for drivers whose
 planes only support linear layout

On Thu, Jan 27, 2022 at 12:25:36PM +0900, Tomohito Esaki wrote:
> Some drivers whose planes only support linear layout fb do not support format
> modifiers.
> These drivers should support modifiers, however the DRM core should handle this
> rather than open-coding in every driver.
> 
> In this patch series, these drivers expose format modifiers based on the
> following suggestion[1].
> 
> On Thu, Nov 18, 2021 at 01:02:11PM +0000, Daniel Stone wrote:
> > I think the best way forward here is:
> >   - add a new mode_config.cannot_support_modifiers flag, and enable
> > this in radeon (plus any other drivers in the same boat)
> >   - change drm_universal_plane_init() to advertise the LINEAR modifier
> > when NULL is passed as the modifier list (including installing a
> > default .format_mod_supported hook)
> >   - remove the mode_config.allow_fb_modifiers hook and always
> > advertise modifier support, unless
> > mode_config.cannot_support_modifiers is set
> 
> 
> [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20190509054518.10781-1-etom@igel.co.jp/#24602575

Two procedural things:
- There's an r-b on all the patches from Andy from the last round, please
  include that.
- Please also include a changelog per-patch (at least going forward), that
  helps with judging where a patch series is.

But aside from this I think this looks ready.

Cheers, Daniel

> 
> v5:
> * rebase to the latest master branch (5.17-rc1+)
> 	+ "drm/plane: Make format_mod_supported truly optional" patch [2]
>   [2] https://patchwork.freedesktop.org/patch/467940/?series=98255&rev=3
> 
> * change default_modifiers array from non-static to static
> * remove terminator in default_modifiers array
> * use ARRAY_SIZE to get the format_modifier_count
> * keep a sanity check in plane init func
> * modify several kerneldocs
> 
> v4: https://www.spinics.net/lists/dri-devel/msg329508.html
> * modify documentation for fb_modifiers_not_supported flag in kerneldoc
> 
> v3: https://www.spinics.net/lists/dri-devel/msg329102.html
> * change the order as follows:
>    1. add fb_modifiers_not_supported flag
>    2. add default modifiers
>    3. remove allow_fb_modifiers flag
> * add a conditional disable in amdgpu_dm_plane_init()
> 
> v2: https://www.spinics.net/lists/dri-devel/msg328939.html
> * rebase to the latest master branch (5.16.0+)
>       + "drm/plane: Make format_mod_supported truly optional" patch [2]
> 
> v1: https://www.spinics.net/lists/dri-devel/msg327352.html
> * The initial patch set
> 
> Tomohito Esaki (3):
>   drm: introduce fb_modifiers_not_supported flag in mode_config
>   drm: add support modifiers for drivers whose planes only support
>     linear layout
>   drm: remove allow_fb_modifiers
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   |  6 ++---
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  2 ++
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  2 ++
>  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  1 +
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  2 ++
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  3 +++
>  drivers/gpu/drm/drm_framebuffer.c             |  6 ++---
>  drivers/gpu/drm/drm_ioctl.c                   |  2 +-
>  drivers/gpu/drm/drm_plane.c                   | 23 +++++++++++--------
>  drivers/gpu/drm/nouveau/nouveau_display.c     |  6 +++--
>  drivers/gpu/drm/radeon/radeon_display.c       |  2 ++
>  .../gpu/drm/selftests/test-drm_framebuffer.c  |  1 -
>  include/drm/drm_mode_config.h                 | 18 +++++----------
>  include/drm/drm_plane.h                       |  3 +++
>  14 files changed, 45 insertions(+), 32 deletions(-)
> 
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch