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drm: introduce fb_modifiers_not_supported flag in mode_config

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If only linear modifier is advertised, since there are many drivers that
only linear supported, the DRM core should handle this rather than
open-coding in every driver. However, there are legacy drivers such as
radeon that do not support modifiers but infer the actual layout of the
underlying buffer. Therefore, a new flag fb_modifiers_not_supported is
introduced for these legacy drivers, and allow_fb_modifiers is replaced
with this new flag.

v3:
 - 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()

v4:
 - modify kernel docs

v5:
 - modify kernel docs

Signed-off-by: Tomohito Esaki <etom@igel.co.jp>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220128060836.11216-2-etom@igel.co.jp
This commit is contained in:
Tomohito Esaki
2022-01-28 15:08:34 +09:00
committed by Daniel Vetter
parent 9987151a90
commit 2af104290d
11 changed files with 33 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/drm/drm_mode_config.h
View File

@@ -933,6 +933,16 @@ struct drm_mode_config {
*/
bool allow_fb_modifiers;
/**
* @fb_modifiers_not_supported:
*
* When this flag is set, the DRM device will not expose modifier
* support to userspace. This is only used by legacy drivers that infer
* the buffer layout through heuristics without using modifiers. New
* drivers shall not set fhis flag.
*/
bool fb_modifiers_not_supported;
/**
* @normalize_zpos:
*