[PATCH 3.18 08/83] drm/ast: change resolution may cause screen blurred

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>

commit 1a37bd823891568f8721989aed0615835632d81a upstream.

The value of pitches is not correct while calling mode_set.
The issue we found so far on following system:
- Debian8 with XFCE Desktop
- Ubuntu with KDE Desktop
- SUSE15 with KDE Desktop

Signed-off-by: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Tested-by: Jean Delvare <jdelvare@xxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/ast/ast_mode.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -549,6 +549,7 @@ static int ast_crtc_do_set_base(struct d
 	}
 	ast_bo_unreserve(bo);
 
+	ast_set_offset_reg(crtc);
 	ast_set_start_address_crt1(crtc, (u32)gpu_addr);
 
 	return 0;