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....
v2: * rebase to the latest master branch (5.16.0+) + "drm/plane: Make format_mod_supported truly optional" patch [2] [2] https://patchwork.freedesktop.org/patch/467940/?series=98255&rev=3
v1: https://www.spinics.net/lists/dri-devel/msg327352.html * The initial patch set
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 | 22 +++++++++---------- 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, 40 insertions(+), 33 deletions(-)