Merge tag 'drm-misc-next-2024-03-28' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

Two misc-next in one.

drm-misc-next for v6.10-rc1:

The deal of a lifetime! You get ALL of the previous
drm-misc-next-2024-03-21-1 tag!!

But WAIT, there's MORE!

Cross-subsystem Changes:
- Assorted DT binding updates.

Core Changes:
- Clarify how optional wait_hpd_asserted is.
- Shuffle Kconfig names around.

Driver Changes:
- Assorted build fixes for panthor, imagination,
- Add AUO B120XAN01.0 panels.
- Assorted small fixes to panthor, panfrost.

drm-misc-next for v6.10:
UAPI Changes:
- Move some nouveau magic constants to uapi.

Cross-subsystem Changes:
- Move drm-misc to gitlab and freedesktop hosting.
- Add entries for panfrost.

Core Changes:
- Improve placement for TTM bo's in idle/busy handling.
- Improve drm/bridge init ordering.
- Add CONFIG_DRM_WERROR, and use W=1 for drm.
- Assorted documentation updates.
- Make more (drm and driver) headers self-contained and add header
  guards.
- Grab reservation lock in pin/unpin callbacks.
- Fix reservation lock handling for vmap.
- Add edp and edid panel matching, use it to fix a nearly identical
  panel.

Driver Changes:
- Add drm/panthor driver and assorted fixes.
- Assorted small fixes to xlnx, panel-edp, tidss, ci, nouveau,
  panel and bridge drivers.
- Add Samsung s6e3fa7, BOE NT116WHM-N44, CMN N116BCA-EA1,
  CrystalClear CMT430B19N00, Startek KD050HDFIA020-C020A,
  powertip PH128800T006-ZHC01 panels.
- Fix console for omapdrm.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/bea310a6-6ff6-477e-9363-f9f053cfd12a@linux.intel.com

1 files changed, 22 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 521a71c61b16..28abe9aa99ca 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -657,6 +657,13 @@ static void drm_atomic_bridge_call_post_disable(struct drm_bridge *bridge,
  * bridge will be called before the previous one to reverse the @pre_enable
  * calling direction.
  *
+ * Example:
+ * Bridge A ---> Bridge B ---> Bridge C ---> Bridge D ---> Bridge E
+ *
+ * With pre_enable_prev_first flag enable in Bridge B, D, E then the resulting
+ * @post_disable order would be,
+ * Bridge B, Bridge A, Bridge E, Bridge D, Bridge C.
+ *
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
@@ -687,11 +694,17 @@ void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
 				 */
 				list_for_each_entry_from(next, &encoder->bridge_chain,
 							 chain_node) {
-					if (next->pre_enable_prev_first) {
+					if (!next->pre_enable_prev_first) {
 						next = list_prev_entry(next, chain_node);
 						limit = next;
 						break;
 					}
+
+					if (list_is_last(&next->chain_node,
+							 &encoder->bridge_chain)) {
+						limit = next;
+						break;
+					}
 				}
 
 				/* Call these bridges in reverse order */
@@ -747,6 +760,13 @@ static void drm_atomic_bridge_call_pre_enable(struct drm_bridge *bridge,
  * If a bridge sets @pre_enable_prev_first, then the pre_enable for the
  * prev bridge will be called before pre_enable of this bridge.
  *
+ * Example:
+ * Bridge A ---> Bridge B ---> Bridge C ---> Bridge D ---> Bridge E
+ *
+ * With pre_enable_prev_first flag enable in Bridge B, D, E then the resulting
+ * @pre_enable order would be,
+ * Bridge C, Bridge D, Bridge E, Bridge A, Bridge B.
+ *
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
@@ -774,7 +794,7 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
 					/* Found first bridge that does NOT
 					 * request prev to be enabled first
 					 */
-					limit = list_prev_entry(next, chain_node);
+					limit = next;
 					break;
 				}
 			}