linux-kernel - [PATCH] drm/radeon: Fix ECS A740GM-M DVI-D EDID error flooding problem

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Date:	Wed, 20 Jul 2011 10:34:05 +0200
From:	reimth@...glemail.com
To:	Dave Airlie <airlied@...hat.com>,
	Alex Deucher <alexdeucher@...il.com>,
	Mario Kleiner <mario.kleiner@...bingen.mpg.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Tyson Whitehead <twhitehead@...il.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Stephen Michaels <Stephen.Micheals@...il.com>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Thomas Reim <reimth@...il.com>
Subject: [PATCH] drm/radeon: Fix ECS A740GM-M DVI-D EDID error flooding problem

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

   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: Fix Asus M2A-VM HDMI EDID error flooding problem

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

Signed-off-by: Thomas Reim <reimth@...il.com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 2e70be2..82dacc6 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -449,6 +449,15 @@ 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;
-- 
1.7.1

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