linux-kernel - [PATCH] drm/radeon/kms: Add default 800x600 mode when getting bad EDID

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Message-Id: <1258016979-2083-1-git-send-email-jglisse@redhat.com>
Date:	Thu, 12 Nov 2009 10:09:39 +0100
From:	Jerome Glisse <jglisse@...hat.com>
To:	airlied@...il.com
Cc:	dri-devel@...ts.sf.net, linux-kernel@...r.kernel.org,
	Jerome Glisse <jglisse@...hat.com>
Subject: [PATCH] drm/radeon/kms: Add default 800x600 mode when getting bad EDID

Adding default 800x600 mode should be a safe fail solution in front
of broken EDID, user can then add new mode to fit its needs.

Signed-off-by: Jerome Glisse <jglisse@...hat.com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 292b170..4dec82e 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -566,8 +566,10 @@ static enum drm_connector_status radeon_vga_detect(struct drm_connector *connect
 		radeon_i2c_do_lock(radeon_connector, 0);
 
 		if (!radeon_connector->edid) {
-			DRM_ERROR("DDC responded but not EDID found for %s\n",
+			DRM_ERROR("DDC responded but not EDID found for %s, adding default mode\n",
 				  drm_get_connector_name(connector));
+			if (!drm_add_modes_noedid(&radeon_connector->base, 800, 600))
+				ret = connector_status_connected;
 		} else {
 			radeon_connector->use_digital = !!(radeon_connector->edid->input & DRM_EDID_INPUT_DIGITAL);
 
@@ -720,8 +722,10 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
 		radeon_i2c_do_lock(radeon_connector, 0);
 
 		if (!radeon_connector->edid) {
-			DRM_ERROR("DDC responded but not EDID found for %s\n",
+			DRM_ERROR("DDC responded but not EDID found for %s, adding default mode\n",
 				  drm_get_connector_name(connector));
+			if (!drm_add_modes_noedid(&radeon_connector->base, 800, 600))
+				ret = connector_status_connected;
 		} else {
 			radeon_connector->use_digital = !!(radeon_connector->edid->input & DRM_EDID_INPUT_DIGITAL);
 
-- 
1.6.5.2

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