[PATCH] drm/radeon/kms: Add DDC quirk for ASUS RS400

[alexdeucher at gmail.com]

From: Alex Deucher <alexander.deucher at amd.com>

vbios is missing a ddc entry for the DVI-D port.
Reported by ponyofdeath on IRC.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at vger.kernel.org
---
 drivers/gpu/drm/radeon/radeon_combios.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 81fc100..b9ad45e 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -2152,6 +2152,7 @@ static bool radeon_apply_legacy_quirks(struct drm_device *dev,
 				       struct radeon_i2c_bus_rec *ddc_i2c,
 				       struct radeon_hpd *hpd)
 {
+	struct radeon_device *rdev = dev->dev_private;
 
 	/* Certain IBM chipset RN50s have a BIOS reporting two VGAs,
 	   one with VGA DDC and one with CRT2 DDC. - kill the CRT2 DDC one */
@@ -2170,6 +2171,14 @@ static bool radeon_apply_legacy_quirks(struct drm_device *dev,
 			return false;
 	}
 
+	/* ASUS RS400 system with missing DVI port DDC */
+	if (dev->pdev->device == 0x5A41 &&
+	    dev->pdev->subsystem_vendor == 0x1043 &&
+	    dev->pdev->subsystem_device == 0x81C8) {
+		if (*legacy_connector == CONNECTOR_DVI_D_LEGACY)
+			*ddc_i2c = combios_setup_i2c_bus(rdev, DDC_MONID, 0, 0);
+	}
+
 	return true;
 }
 
-- 
1.7.3.4