linux-kernel - [PATCH 3.12 031/124] drm/mgag200: Reject non-character-cell-aligned mode widths

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Message-Id: <cd717d1427bc8ea23ff1565817bdde58ba10227a.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:42:45 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Adam Jackson <ajax@...hat.com>,
	Dave Airlie <airlied@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 031/124] drm/mgag200: Reject non-character-cell-aligned mode widths

From: Adam Jackson <ajax@...hat.com>

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

===============

commit 25161084b1c1b0c29948f6f77266a35f302196b7 upstream.

Turns out 1366x768 does not in fact work on this hardware.

Signed-off-by: Adam Jackson <ajax@...hat.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 1288cd9f67d1..01fe953f9ea8 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1531,6 +1531,11 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
 		return MODE_BANDWIDTH;
 	}
 
+	if ((mode->hdisplay % 8) != 0 || (mode->hsync_start % 8) != 0 ||
+	    (mode->hsync_end % 8) != 0 || (mode->htotal % 8) != 0) {
+		return MODE_H_ILLEGAL;
+	}
+
 	if (mode->crtc_hdisplay > 2048 || mode->crtc_hsync_start > 4096 ||
 	    mode->crtc_hsync_end > 4096 || mode->crtc_htotal > 4096 ||
 	    mode->crtc_vdisplay > 2048 || mode->crtc_vsync_start > 4096 ||
-- 
2.4.6

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