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drm/ast: Handle framebuffer from dma-buf

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In the atomic update callback, ast should call
drm_gem_fb_begin_cpu_access() to make sure it can read the
framebuffer from the CPU, otherwise the data might not be there due
to cache, and synchronization.

Tested on a Lenovo SE100, while rendering on the ArrowLake GPU with
i915 driver, and using ast for display.

Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20251030091627.340780-1-jfalempe@redhat.com
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
This commit is contained in:
Jocelyn Falempe 2025-10-30 10:14:11 +01:00
parent 410d88782a
commit 3dd0be7a30
1 changed files with 8 additions and 3 deletions
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11
drivers/gpu/drm/ast/ast_mode.c
View File

@ -557,9 +557,14 @@ static void ast_primary_plane_helper_atomic_update(struct drm_plane *plane,
ast_set_vbios_color_reg(ast, fb->format, ast_crtc_state->vmode);
}
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
ast_handle_damage(ast_plane, shadow_plane_state->data, fb, &damage);
/* if the buffer comes from another device */
if (drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE) == 0) {
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
ast_handle_damage(ast_plane, shadow_plane_state->data, fb, &damage);
}
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
}
/*