Patch "drm/amd/display: ensure async flips are only accepted for fast updates" has been added to the 6.4-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amd/display: ensure async flips are only accepted for fast updates

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-ensure-async-flips-are-only-accepted-for-fast-updates.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From a7c0cad0dc060bb77e9c9d235d68441b0fc69507 Mon Sep 17 00:00:00 2001
From: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Date: Fri, 4 Aug 2023 11:13:04 -0400
Subject: drm/amd/display: ensure async flips are only accepted for fast updates

From: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>

commit a7c0cad0dc060bb77e9c9d235d68441b0fc69507 upstream.

We should be checking to see if async flips are supported in
amdgpu_dm_atomic_check() (i.e. not dm_crtc_helper_atomic_check()). Also,
async flipping isn't supported if a plane's framebuffer changes memory
domains during an atomic commit. So, move the check from
dm_crtc_helper_atomic_check() to amdgpu_dm_atomic_check() and check if
the memory domain has changed in amdgpu_dm_atomic_check().

Cc: stable@xxxxxxxxxxxxxxx
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2733
Fixes: c1e18c44dc7f ("drm/amd/display: only accept async flips for fast updates")
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c      |   24 ++++++++++++++---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c |   12 --------
 2 files changed, 21 insertions(+), 15 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7993,10 +7993,12 @@ static void amdgpu_dm_commit_planes(stru
 		 * fast updates.
 		 */
 		if (crtc->state->async_flip &&
-		    acrtc_state->update_type != UPDATE_TYPE_FAST)
+		    (acrtc_state->update_type != UPDATE_TYPE_FAST ||
+		     get_mem_type(old_plane_state->fb) != get_mem_type(fb)))
 			drm_warn_once(state->dev,
 				      "[PLANE:%d:%s] async flip with non-fast update\n",
 				      plane->base.id, plane->name);
+
 		bundle->flip_addrs[planes_count].flip_immediate =
 			crtc->state->async_flip &&
 			acrtc_state->update_type == UPDATE_TYPE_FAST &&
@@ -9953,6 +9955,11 @@ static int amdgpu_dm_atomic_check(struct
 
 	/* Remove exiting planes if they are modified */
 	for_each_oldnew_plane_in_state_reverse(state, plane, old_plane_state, new_plane_state, i) {
+		if (old_plane_state->fb && new_plane_state->fb &&
+		    get_mem_type(old_plane_state->fb) !=
+		    get_mem_type(new_plane_state->fb))
+			lock_and_validation_needed = true;
+
 		ret = dm_update_plane_state(dc, state, plane,
 					    old_plane_state,
 					    new_plane_state,
@@ -10200,9 +10207,20 @@ static int amdgpu_dm_atomic_check(struct
 		struct dm_crtc_state *dm_new_crtc_state =
 			to_dm_crtc_state(new_crtc_state);
 
+		/*
+		 * Only allow async flips for fast updates that don't change
+		 * the FB pitch, the DCC state, rotation, etc.
+		 */
+		if (new_crtc_state->async_flip && lock_and_validation_needed) {
+			drm_dbg_atomic(crtc->dev,
+				       "[CRTC:%d:%s] async flips are only supported for fast updates\n",
+				       crtc->base.id, crtc->name);
+			ret = -EINVAL;
+			goto fail;
+		}
+
 		dm_new_crtc_state->update_type = lock_and_validation_needed ?
-							 UPDATE_TYPE_FULL :
-							 UPDATE_TYPE_FAST;
+			UPDATE_TYPE_FULL : UPDATE_TYPE_FAST;
 	}
 
 	/* Must be success */
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
@@ -398,18 +398,6 @@ static int dm_crtc_helper_atomic_check(s
 		return -EINVAL;
 	}
 
-	/*
-	 * Only allow async flips for fast updates that don't change the FB
-	 * pitch, the DCC state, rotation, etc.
-	 */
-	if (crtc_state->async_flip &&
-	    dm_crtc_state->update_type != UPDATE_TYPE_FAST) {
-		drm_dbg_atomic(crtc->dev,
-			       "[CRTC:%d:%s] async flips are only supported for fast updates\n",
-			       crtc->base.id, crtc->name);
-		return -EINVAL;
-	}
-
 	/* In some use cases, like reset, no stream is attached */
 	if (!dm_crtc_state->stream)
 		return 0;


Patches currently in stable-queue which might be from hamza.mahfooz@xxxxxxx are

queue-6.4/partially-revert-drm-amd-display-fix-possible-underf.patch
queue-6.4/drm-amd-display-ensure-async-flips-are-only-accepted-for-fast-updates.patch



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