linux-kernel - [21/90] drm/radeon: Extended DDC Probing for ECS A740GM-M DVI-D Connector

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Date:	Fri, 12 Aug 2011 14:04:06 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Thomas Reim <reimth@...il.com>,
	Stephen Michaels <Stephen.Micheals@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [21/90] drm/radeon: Extended DDC Probing for ECS A740GM-M DVI-D Connector

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: Thomas Reim <reimth@...il.com>

commit a81b31e9fc98e067b7e7f1244861c97e44268e2d upstream.

   ECS A740GM-M with ATI RADEON 2100 sends data to i2c bus
   for a DVI connector that is not implemented/existent on the board.

   Fix by applying extented DDC probing for this connector.

   Requires [PATCH] drm/radeon: Extended DDC Probing for Connectors
   with Improperly Wired DDC Lines

   Tested for kernel 2.6.38 on Asus ECS A740GM-M board

   BugLink: http://bugs.launchpad.net/bugs/810926

Signed-off-by: Thomas Reim <reimth@...il.com>
Reviewed-by: Alex Deucher <alexdeucher@...il.com>
Acked-by: Stephen Michaels <Stephen.Micheals@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/radeon_connectors.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -455,6 +455,15 @@ static bool radeon_connector_needs_exten
 		    (supported_device == ATOM_DEVICE_DFP2_SUPPORT))
 			return true;
 	}
+	/* ECS A740GM-M with ATI RADEON 2100 sends data to i2c bus
+	 * for a DVI connector that is not implemented */
+	if ((dev->pdev->device == 0x796e) &&
+	    (dev->pdev->subsystem_vendor == 0x1019) &&
+	    (dev->pdev->subsystem_device == 0x2615)) {
+		if ((connector_type == DRM_MODE_CONNECTOR_DVID) &&
+		    (supported_device == ATOM_DEVICE_DFP2_SUPPORT))
+			return true;
+	}
 
 	/* Default: no EDID header probe required for DDC probing */
 	return false;


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