On 2/6/23 23:05, Tianci Yin wrote:
From: tiancyin <tianci....@amd.com>
[Why]
Display pipe might be harvested on some SKUs, that cause the
adev->mode_info.num_crtc mismatch with the usable crtc number,
then below error dmesgs observed after GPU recover.
*ERROR* amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
[How]
The max_streams is limited number after pipe fuse, align num_crtc
to max_streams to eliminate the error logs.
Signed-off-by: tiancyin <tianci....@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +++
1 file changed, 3 insertions(+)
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 b31cfda30ff9..87ec2574cc09 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4285,6 +4285,9 @@ static int amdgpu_dm_initialize_drm_device(struct
amdgpu_device *adev)
break;
}
+ /* Adjust the crtc number according to the DCN pipe fuse. */
+ adev->mode_info.num_crtc = dm->dc->caps.max_streams;
This would introduce array-out-bounds issues, since there are arrays of
size AMDGPU_MAX_CRTCS that use num_crtc as a bounds check.
+
for (i = 0; i < dm->dc->caps.max_streams; i++)
if (amdgpu_dm_crtc_init(dm, mode_info->planes[i], i)) {
DRM_ERROR("KMS: Failed to initialize crtc\n");
--
Hamza
