Patch "drm/amdgpu: keep fbdev buffers pinned during suspend" has been added to the 5.18-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    drm/amdgpu: keep fbdev buffers pinned during suspend

to the 5.18-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-amdgpu-keep-fbdev-buffers-pinned-during-suspend.patch
and it can be found in the queue-5.18 subdirectory.

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



commit 256a93ae755f16a9c537b7606e6fd8b57cb3653a
Author: Alex Deucher <alexander.deucher@xxxxxxx>
Date:   Tue Jun 21 10:04:55 2022 -0400

    drm/amdgpu: keep fbdev buffers pinned during suspend
    
    [ Upstream commit f9a89117fbdc63c0d4ab63a8f3596a72c245bcfe ]
    
    Was dropped when we converted to the generic helpers.
    
    Fixes: 087451f372bf ("drm/amdgpu: use generic fb helpers instead of setting up AMD own's.")
    Acked-by: Evan Quan <evan.quan@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index fae5c1debfad..ffb3702745a5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -1547,6 +1547,21 @@ bool amdgpu_crtc_get_scanout_position(struct drm_crtc *crtc,
 						  stime, etime, mode);
 }
 
+static bool
+amdgpu_display_robj_is_fb(struct amdgpu_device *adev, struct amdgpu_bo *robj)
+{
+	struct drm_device *dev = adev_to_drm(adev);
+	struct drm_fb_helper *fb_helper = dev->fb_helper;
+
+	if (!fb_helper || !fb_helper->buffer)
+		return false;
+
+	if (gem_to_amdgpu_bo(fb_helper->buffer->gem) != robj)
+		return false;
+
+	return true;
+}
+
 int amdgpu_display_suspend_helper(struct amdgpu_device *adev)
 {
 	struct drm_device *dev = adev_to_drm(adev);
@@ -1582,10 +1597,12 @@ int amdgpu_display_suspend_helper(struct amdgpu_device *adev)
 			continue;
 		}
 		robj = gem_to_amdgpu_bo(fb->obj[0]);
-		r = amdgpu_bo_reserve(robj, true);
-		if (r == 0) {
-			amdgpu_bo_unpin(robj);
-			amdgpu_bo_unreserve(robj);
+		if (!amdgpu_display_robj_is_fb(adev, robj)) {
+			r = amdgpu_bo_reserve(robj, true);
+			if (r == 0) {
+				amdgpu_bo_unpin(robj);
+				amdgpu_bo_unreserve(robj);
+			}
 		}
 	}
 	return 0;