drm/radeon: Extended DDC Probing for ECS A740GM-M DVI-D Connector

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@gmail.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Acked-by: Stephen Michaels <Stephen.Micheals@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 6a0f1be..6d6b5f1 100644 (file)
--- 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_extended_probe(struct radeon_device *dev,
                    (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;