When the framebuffer is a vmwgfx dma buffer and a proxy surface is
created, the vmw_kms_update_proxy() function requires that the proxy
surface width and the framebuffer pitch are compatible, otherwise
display corruption occurs as seen in gnome-shell/native with software
3D. Since the framebuffer pitch is determined by user-space, allocate
a proxy surface the width of which is based on the framebuffer pitch
rather than on the framebuffer width.
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Raphael Hertzog <buxy@xxxxxxxx>
Tested-by: Mati Aharoni <muts@xxxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Brian Paul <brianp@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 9b4bb9e..7c2e118 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -763,21 +763,25 @@ static int vmw_create_dmabuf_proxy(struct drm_device *dev,
uint32_t format;
struct drm_vmw_size content_base_size;
struct vmw_resource *res;
+ unsigned int bytes_pp;
int ret;
switch (mode_cmd->depth) {
case 32:
case 24:
format = SVGA3D_X8R8G8B8;
+ bytes_pp = 4;
break;
case 16:
case 15:
format = SVGA3D_R5G6B5;
+ bytes_pp = 2;
break;
case 8:
format = SVGA3D_P8;
+ bytes_pp = 1;
break;
default:
@@ -785,7 +789,7 @@ static int vmw_create_dmabuf_proxy(struct drm_device *dev,
return -EINVAL;
}
- content_base_size.width = mode_cmd->width;
+ content_base_size.width = mode_cmd->pitch / bytes_pp;
content_base_size.height = mode_cmd->height;
content_base_size.depth = 1;
--
2.4.3
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