[PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc_cursor"

[PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc_cursor"

[Hamza Mahfooz]

From: Ivan Lipski <ivlipski@amd.com>

This reverts commit 45e1ade04b4d60fe5df859076005779f27c4c9be.

Since, it causes the following IGT tests to fail:
kms_cursor_legacy@cursor-vs-flip.*
kms_cursor_legacy@flip-vs-cursor.*

Signed-off-by: Ivan Lipski <ivlipski@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 32156609fbcf..49ffb4d6e9cc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10290,24 +10290,14 @@ static int dm_check_crtc_cursor(struct drm_atomic_state *state,
 	 * blending properties match the underlying planes'.
 	 */
 
-	new_cursor_state = drm_atomic_get_plane_state(state, cursor);
-	if (IS_ERR(new_cursor_state))
-		return PTR_ERR(new_cursor_state);
-
-	if (!new_cursor_state->fb)
+	new_cursor_state = drm_atomic_get_new_plane_state(state, cursor);
+	if (!new_cursor_state || !new_cursor_state->fb)
 		return 0;
 
 	dm_get_oriented_plane_size(new_cursor_state, &cursor_src_w, &cursor_src_h);
 	cursor_scale_w = new_cursor_state->crtc_w * 1000 / cursor_src_w;
 	cursor_scale_h = new_cursor_state->crtc_h * 1000 / cursor_src_h;
 
-	/* Need to check all enabled planes, even if this commit doesn't change
-	 * their state
-	 */
-	i = drm_atomic_add_affected_planes(state, crtc);
-	if (i)
-		return i;
-
 	for_each_new_plane_in_state_reverse(state, underlying, new_underlying_state, i) {
 		/* Narrow down to non-cursor planes on the same CRTC as the cursor */
 		if (new_underlying_state->crtc != crtc || underlying == crtc->cursor)
-- 
2.42.0

Re: [PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc_cursor"

[Michel Dänzer]

On 9/29/23 22:41, Hamza Mahfooz wrote:
> From: Ivan Lipski <ivlipski@amd.com>
> 
> This reverts commit 45e1ade04b4d60fe5df859076005779f27c4c9be.
> 
> Since, it causes the following IGT tests to fail:
> kms_cursor_legacy@cursor-vs-flip.*
> kms_cursor_legacy@flip-vs-cursor.*

Any information about how those tests fail? Maybe they accidentally rely on the broken behaviour?


FWIW, something like the reverted commit is definitely needed, see https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3177#note_1829068 . That MR is blocked by the reverted fix.


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer

Re: [PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc_cursor"

[Michel Dänzer]

On 10/2/23 12:05, Michel Dänzer wrote:
> On 9/29/23 22:41, Hamza Mahfooz wrote:
>> From: Ivan Lipski <ivlipski@amd.com>
>>
>> This reverts commit 45e1ade04b4d60fe5df859076005779f27c4c9be.
>>
>> Since, it causes the following IGT tests to fail:
>> kms_cursor_legacy@cursor-vs-flip.*
>> kms_cursor_legacy@flip-vs-cursor.*
> 
> Any information about how those tests fail? Maybe they accidentally rely on the broken behaviour?

I was able to reproduce, that doesn't seem to be the case. They just rely on multiple legacy cursor ioctl calls being able to complete between consecutive flips, which I suppose is broken by always pulling in non-cursor plane state with any cursor plane state changes.

I'll see if I can find a better solution. Meanwhile,

Acked-by: Michel Dänzer <mdaenzer@redhat.com>

for the revert.


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer

Re: [PATCH] Revert "drm/amd/display: Check all enabled planes in dm_check_crtc_cursor"

[Michel Dänzer]

On 10/2/23 12:48, Michel Dänzer wrote:
> On 10/2/23 12:05, Michel Dänzer wrote:
>> On 9/29/23 22:41, Hamza Mahfooz wrote:
>>> From: Ivan Lipski <ivlipski@amd.com>
>>>
>>> This reverts commit 45e1ade04b4d60fe5df859076005779f27c4c9be.
>>>
>>> Since, it causes the following IGT tests to fail:
>>> kms_cursor_legacy@cursor-vs-flip.*
>>> kms_cursor_legacy@flip-vs-cursor.*
>>
>> Any information about how those tests fail? Maybe they accidentally rely on the broken behaviour?
> 
> I was able to reproduce, that doesn't seem to be the case. They just rely on multiple legacy cursor ioctl calls being able to complete between consecutive flips, which I suppose is broken by always pulling in non-cursor plane state with any cursor plane state changes.
> 
> I'll see if I can find a better solution. Meanwhile,
> 
> Acked-by: Michel Dänzer <mdaenzer@redhat.com>
> 
> for the revert.

Alternatively, here's an incremental fix:

https://patchwork.freedesktop.org/series/124527/


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer