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drm/amd/display: add basic atomic check for cursor plane 

This patch adds a basic cursor check when an atomic test-only commit is
performed. The position and size of the cursor plane is checked.

This should fix user-space relying on atomic checks to assign buffers to
planes.

Signed-off-by: Simon Ser <contact@emersion.fr>
Reported-by: Roman Gilg <subdiff@gmail.com>
References: https://github.com/emersion/libliftoff/issues/46
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Harry Wentland <hwentlan@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Simon Ser 2020-03-30 09:23:21 +00:00 committed by Alex Deucher
parent 2346ef47e8
commit 626bf90fe0
1 changed files with 24 additions and 2 deletions
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26
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -7855,6 +7855,7 @@ static int dm_update_plane_state(struct dc *dc,
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct dm_crtc_state *dm_new_crtc_state, *dm_old_crtc_state;
struct dm_plane_state *dm_new_plane_state, *dm_old_plane_state;
struct amdgpu_crtc *new_acrtc;
bool needs_reset;
int ret = 0;
@ -7864,9 +7865,30 @@ static int dm_update_plane_state(struct dc *dc,
dm_new_plane_state = to_dm_plane_state(new_plane_state);
dm_old_plane_state = to_dm_plane_state(old_plane_state);
/*TODO Implement atomic check for cursor plane */
if (plane->type == DRM_PLANE_TYPE_CURSOR)
/*TODO Implement better atomic check for cursor plane */
if (plane->type == DRM_PLANE_TYPE_CURSOR) {
if (!enable || !new_plane_crtc ||
drm_atomic_plane_disabling(plane->state, new_plane_state))
return 0;
new_acrtc = to_amdgpu_crtc(new_plane_crtc);
if ((new_plane_state->crtc_w > new_acrtc->max_cursor_width) ||
(new_plane_state->crtc_h > new_acrtc->max_cursor_height)) {
DRM_DEBUG_ATOMIC("Bad cursor size %d x %d\n",
new_plane_state->crtc_w, new_plane_state->crtc_h);
return -EINVAL;
}
if (new_plane_state->crtc_x <= -new_acrtc->max_cursor_width ||
new_plane_state->crtc_y <= -new_acrtc->max_cursor_height) {
DRM_DEBUG_ATOMIC("Bad cursor position %d, %d\n",
new_plane_state->crtc_x, new_plane_state->crtc_y);
return -EINVAL;
}
return 0;
}
needs_reset = should_reset_plane(state, plane, old_plane_state,
new_plane_state);