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

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Date:   Wed, 22 Dec 2021 14:27:24 +0900
From:   Tomohito Esaki <etom@...l.co.jp>
To:     dri-devel@...ts.freedesktop.org
Cc:     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, Tomohito Esaki <etom@...l.co.jp>,
        Damian Hobson-Garcia <dhobsong@...l.co.jp>,
        Takanari Hayama <taki@...l.co.jp>
Subject: [RFC PATCH 0/3] Add support modifiers for drivers whose planes only support linear layout

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


Tomohito Esaki (3):
  drm: add support modifiers for drivers whose planes only support
    linear layout
  drm: set fb_modifiers_not_supported flag in legacy drivers
  drm: replace allow_fb_modifiers with fb_modifiers_not_supported

 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 +
 drivers/gpu/drm/drm_framebuffer.c             |  6 +--
 drivers/gpu/drm/drm_ioctl.c                   |  2 +-
 drivers/gpu/drm/drm_plane.c                   | 41 +++++++++++--------
 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 ++
 13 files changed, 54 insertions(+), 38 deletions(-)

-- 
2.17.1