[PATCH 1/2] drm/radeon: Try harder to avoid HW cursor ending on a multiple of 128 columns.

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

This could previously fail if either of the enabled displays was using a
horizontal resolution that is a multiple of 128, and only the leftmost column
of the cursor was (supposed to be) visible at the right edge of that display.

The solution is to move the cursor one pixel to the left in that case.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33183

Cc: stable at vger.kernel.org
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 drivers/gpu/drm/radeon/radeon_cursor.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_cursor.c b/drivers/gpu/drm/radeon/radeon_cursor.c
index 42acc64..711e95a 100644
--- a/drivers/gpu/drm/radeon/radeon_cursor.c
+++ b/drivers/gpu/drm/radeon/radeon_cursor.c
@@ -262,8 +262,14 @@ int radeon_crtc_cursor_move(struct drm_crtc *crtc,
 				if (!(cursor_end & 0x7f))
 					w--;
 			}
-			if (w <= 0)
+			if (w <= 0) {
 				w = 1;
+				cursor_end = x - xorigin + w;
+				if (!(cursor_end & 0x7f)) {
+					x--;
+					WARN_ON_ONCE(x < 0);
+				}
+			}
 		}
 	}
 
-- 
1.7.10