linux-kernel - [ 215/218] drm/udl: limit modes to the sku pixel limits.

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Message-Id: <20120928201526.276055307@linuxfoundation.org>
Date:	Fri, 28 Sep 2012 13:17:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Alex Deucher <alexander.deucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 215/218] drm/udl: limit modes to the sku pixel limits.

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

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

From: Dave Airlie <airlied@...hat.com>

commit 3a75885848996baab5276ff37ebf7295c3c753f0 upstream.

Otherwise when X starts we commonly get a black screen scanning
out nothing, its wierd dpms on/off from userspace brings it back,

With this on F18, multi-seat works again with my 1920x1200 monitor
which is above the sku limit for the device I have.

Reviewed-by: Alex Deucher <alexander.deucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/udl/udl_connector.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -69,6 +69,13 @@ static int udl_get_modes(struct drm_conn
 static int udl_mode_valid(struct drm_connector *connector,
 			  struct drm_display_mode *mode)
 {
+	struct udl_device *udl = connector->dev->dev_private;
+	if (!udl->sku_pixel_limit)
+		return 0;
+
+	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
+		return MODE_VIRTUAL_Y;
+
 	return 0;
 }
 


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