linux-kernel - [PATCH 5.18 048/231] drm/amdgpu: keep fbdev buffers pinned during suspend

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Date:   Tue, 19 Jul 2022 13:52:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 048/231] drm/amdgpu: keep fbdev buffers pinned during suspend

From: Alex Deucher <alexander.deucher@....com>

[ 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@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 25 +++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

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;
-- 
2.35.1