[PATCH] drm/amdgpu/fb: use virt_to_phys to get smem_start

[PATCH] drm/amdgpu/fb: use virt_to_phys to get smem_start

[Alex Deucher]

We set the fb smem pointer to the offset into the BAR which doesn't
handle framebuffers in system memory. Use virt_to_phys which should
handle both BARs and system memory.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=207581
Fixes: 6c8d74caa2fa33 ("drm/amdgpu: Enable scatter gather display support")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 25ddb482466a..caef156fbd1f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -205,7 +205,6 @@ static int amdgpufb_create(struct drm_fb_helper *helper,
 	struct drm_gem_object *gobj = NULL;
 	struct amdgpu_bo *abo = NULL;
 	int ret;
-	unsigned long tmp;
 
 	mode_cmd.width = sizes->surface_width;
 	mode_cmd.height = sizes->surface_height;
@@ -245,8 +244,7 @@ static int amdgpufb_create(struct drm_fb_helper *helper,
 
 	info->fbops = &amdgpufb_ops;
 
-	tmp = amdgpu_bo_gpu_offset(abo) - adev->gmc.vram_start;
-	info->fix.smem_start = adev->gmc.aper_base + tmp;
+	info->fix.smem_start = virt_to_phys(amdgpu_bo_kptr(abo));
 	info->fix.smem_len = amdgpu_bo_size(abo);
 	info->screen_base = amdgpu_bo_kptr(abo);
 	info->screen_size = amdgpu_bo_size(abo);
-- 
2.25.4

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