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drm/atomic-helper: Add helper drm_atomic_helper_check_crtc_state()

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Add drm_atomic_helper_check_crtc_state(), which contains tests common
to many CRTCs. The first added test verifies that an enabled CRTC has
at least one enabled primary plane.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220617103226.25617-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-06-17 12:32:24 +02:00
parent ae25885bdf
commit d6b9af1097
2 changed files with 57 additions and 0 deletions
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55
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -877,6 +877,61 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
}
EXPORT_SYMBOL(drm_atomic_helper_check_plane_state);
/**
* drm_atomic_helper_check_crtc_state() - Check CRTC state for validity
* @crtc_state: CRTC state to check
* @can_disable_primary_planes: can the CRTC be enabled without a primary plane?
*
* Checks that a desired CRTC update is valid. Drivers that provide
* their own CRTC handling rather than helper-provided implementations may
* still wish to call this function to avoid duplication of error checking
* code.
*
* Note that @can_disable_primary_planes only tests if the CRTC can be
* enabled without a primary plane. To test if a primary plane can be updated
* without a CRTC, use drm_atomic_helper_check_plane_state() in the plane's
* atomic check.
*
* RETURNS:
* Zero if update appears valid, error code on failure
*/
int drm_atomic_helper_check_crtc_state(struct drm_crtc_state *crtc_state,
bool can_disable_primary_planes)
{
struct drm_device *dev = crtc_state->crtc->dev;
struct drm_atomic_state *state = crtc_state->state;
if (!crtc_state->enable)
return 0;
/* needs at least one primary plane to be enabled */
if (!can_disable_primary_planes) {
bool has_primary_plane = false;
struct drm_plane *plane;
drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state;
if (plane->type != DRM_PLANE_TYPE_PRIMARY)
continue;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state))
return PTR_ERR(plane_state);
if (plane_state->fb && plane_state->crtc) {
has_primary_plane = true;
break;
}
}
if (!has_primary_plane) {
drm_dbg_kms(dev, "Cannot enable CRTC without a primary plane.\n");
return -EINVAL;
}
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_check_crtc_state);
/**
* drm_atomic_helper_check_planes - validate state object for planes changes
* @dev: DRM device

2
include/drm/drm_atomic_helper.h
View File

@ -46,6 +46,8 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
int max_scale,
bool can_position,
bool can_update_disabled);
int drm_atomic_helper_check_crtc_state(struct drm_crtc_state *crtc_state,
bool can_disable_primary_plane);
int drm_atomic_helper_check_planes(struct drm_device *dev,
struct drm_atomic_state *state);
int drm_atomic_helper_check(struct drm_device *dev,