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drm: Allow drivers to indicate the damage helpers to ignore damage clips 

It allows drivers to set a struct drm_plane_state .ignore_damage_clips in
their plane's .atomic_check callback, as an indication to damage helpers
such as drm_atomic_helper_damage_iter_init() that the damage clips should
be ignored.

To be used by drivers that do per-buffer (e.g: virtio-gpu) uploads (rather
than per-plane uploads), since these type of drivers need to handle buffer
damages instead of frame damages.

That way, these drivers could force a full plane update if the framebuffer
attached to a plane's state has changed since the last update (page-flip).

Fixes: 01f05940a9 ("drm/virtio: Enable fb damage clips property for the primary plane")
Cc: <stable@vger.kernel.org> # v6.4+
Reported-by: nerdopolis <bluescreen_avenger@verizon.net>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218115
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Zack Rusin <zackr@vmware.com>
Acked-by: Sima Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20231123221315.3579454-2-javierm@redhat.com
This commit is contained in:
Javier Martinez Canillas 2023-11-23 23:13:00 +01:00
parent 4653f9d014
commit 35ed38d582
No known key found for this signature in database
GPG Key ID: C751E590D63F3D69
3 changed files with 14 additions and 1 deletions
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2
Documentation/gpu/drm-kms.rst
View File

@ -548,6 +548,8 @@ Plane Composition Properties
.. kernel-doc:: drivers/gpu/drm/drm_blend.c
:doc: overview
.. _damage_tracking_properties:
Damage Tracking Properties
--------------------------

3
drivers/gpu/drm/drm_damage_helper.c
View File

@ -241,7 +241,8 @@ drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter,
iter->plane_src.x2 = (src.x2 >> 16) + !!(src.x2 & 0xFFFF);
iter->plane_src.y2 = (src.y2 >> 16) + !!(src.y2 & 0xFFFF);
if (!iter->clips || !drm_rect_equals(&state->src, &old_state->src)) {
if (!iter->clips || state->ignore_damage_clips ||
!drm_rect_equals(&state->src, &old_state->src)) {
iter->clips = NULL;
iter->num_clips = 0;
iter->full_update = true;

10
include/drm/drm_plane.h
View File

@ -194,6 +194,16 @@ struct drm_plane_state {
*/
struct drm_property_blob *fb_damage_clips;
/**
* @ignore_damage_clips:
*
* Set by drivers to indicate the drm_atomic_helper_damage_iter_init()
* helper that the @fb_damage_clips blob property should be ignored.
*
* See :ref:`damage_tracking_properties` for more information.
*/
bool ignore_damage_clips;
/**
* @src:
*