Instead of drivers duplicating the drm_atomic_helper_check() code to be
able to normalize the zpos they can use the normalize_zpos flag to let the
drm core to do it.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/gpu/drm/drm_atomic_helper.c | 11 +++++++++++
include/drm/drm_mode_config.h | 8 ++++++++
include/drm/drm_plane.h | 4 ++--
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ab4032167094..0f6a4949e6dc 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -873,6 +873,11 @@ EXPORT_SYMBOL(drm_atomic_helper_check_planes);
* functions depend upon an updated adjusted_mode.clock to e.g. properly compute
* watermarks.
*
+ * Note that zpos normalization will add all enable planes to the state which
+ * might not desired for some drivers.
+ * For example enable/disable of a cursor plane which have fixed zpos value
+ * would trigger all other enabled planes to be forced to the state change.
+ *
* RETURNS:
* Zero for success or -errno
*/
@@ -885,6 +890,12 @@ int drm_atomic_helper_check(struct drm_device *dev,
if (ret)
return ret;
+ if (dev->mode_config.normalize_zpos) {
+ ret = drm_atomic_normalize_zpos(dev, state);
+ if (ret)
+ return ret;
+ }
+
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 2cb6f02df64a..0743c01b9f69 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -783,6 +783,14 @@ struct drm_mode_config {
*/
bool allow_fb_modifiers;
+ /**
+ * @normalize_zpos:
+ *
+ * If true the drm core will call drm_atomic_normalize_zpos() as part of
+ * atomic mode checking from drm_atomic_helper_check()
+ */
+ bool normalize_zpos;
+
/**
* @modifiers_property: Plane property to list support modifier/format
* combination.
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 8185e3468a23..2c0adb124e0f 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -50,8 +50,8 @@ struct drm_modeset_acquire_ctx;
* plane with a lower ID.
* @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1
* where N is the number of active planes for given crtc. Note that
- * the driver must call drm_atomic_normalize_zpos() to update this before
- * it can be trusted.
+ * the driver must set drm_mode_config.normalize_zpos or call
+ * drm_atomic_normalize_zpos() to update this before it can be trusted.
* @src: clipped source coordinates of the plane (in 16.16)
* @dst: clipped destination coordinates of the plane
* @state: backpointer to global drm_atomic_state
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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