linux-kernel - [PATCH 3.16 302/370] drm/radeon: Use mode h/vdisplay fields to hide out of bounds HW cursor

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Message-ID: <lsq.1489146383.656940412@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Michel Dänzer" <michel.daenzer@....com>,
        "Sonny Jiang" <sonny.jiang@....com>,
        "Ashutosh Kumar" <ashutosh.kumar@....com>,
        "Alex Deucher" <alexander.deucher@....com>
Subject: [PATCH 3.16 302/370] drm/radeon: Use mode h/vdisplay fields to
 hide out of bounds HW cursor

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Michel Dänzer <michel.daenzer@....com>

commit d74c67dd7800fc7aae381f272875c337f268806c upstream.

The crtc_h/vdisplay fields may not match the CRTC viewport dimensions
with special modes such as interlaced ones.

Fixes the HW cursor disappearing in the bottom half of the screen with
interlaced modes.

Fixes: 6b16cf7785a4 ("drm/radeon: Hide the HW cursor while it's out of bounds")
Reported-by: Ashutosh Kumar <ashutosh.kumar@....com>
Tested-by: Sonny Jiang <sonny.jiang@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Michel Dänzer <michel.daenzer@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/radeon/radeon_cursor.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_cursor.c
+++ b/drivers/gpu/drm/radeon/radeon_cursor.c
@@ -282,8 +282,8 @@ int radeon_crtc_cursor_move(struct drm_c
 	}
 
 	if (x <= (crtc->x - w) || y <= (crtc->y - radeon_crtc->cursor_height) ||
-	    x >= (crtc->x + crtc->mode.crtc_hdisplay) ||
-	    y >= (crtc->y + crtc->mode.crtc_vdisplay))
+	    x >= (crtc->x + crtc->mode.hdisplay) ||
+	    y >= (crtc->y + crtc->mode.vdisplay))
 		goto out_of_bounds;
 
 	x += xorigin;