drm/radeon/kms: don't crash if no DDC bus on VGA/DVI connector.

[sfrench/cifs-2.6.git] / drivers / gpu / drm / radeon / radeon_display.c

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 6a92f994cc26291f33111c4da08b088578d9d410..7e17a362b54baab34cf1b8a41e60a4a5c3c6865b 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -278,7 +278,7 @@ static void radeon_print_display_setup(struct drm_device *dev)
                DRM_INFO("  %s\n", connector_names[connector->connector_type]);
                if (radeon_connector->hpd.hpd != RADEON_HPD_NONE)
                        DRM_INFO("  %s\n", hpd_names[radeon_connector->hpd.hpd]);
-               if (radeon_connector->ddc_bus)
+               if (radeon_connector->ddc_bus) {
                        DRM_INFO("  DDC: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
                                 radeon_connector->ddc_bus->rec.mask_clk_reg,
                                 radeon_connector->ddc_bus->rec.mask_data_reg,
@@ -288,6 +288,15 @@ static void radeon_print_display_setup(struct drm_device *dev)
                                 radeon_connector->ddc_bus->rec.en_data_reg,
                                 radeon_connector->ddc_bus->rec.y_clk_reg,
                                 radeon_connector->ddc_bus->rec.y_data_reg);
+               } else {
+                       if (connector->connector_type == DRM_MODE_CONNECTOR_VGA ||
+                           connector->connector_type == DRM_MODE_CONNECTOR_DVII ||
+                           connector->connector_type == DRM_MODE_CONNECTOR_DVID ||
+                           connector->connector_type == DRM_MODE_CONNECTOR_DVIA ||
+                           connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
+                           connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)
+                               DRM_INFO("  DDC: no ddc bus - possible BIOS bug - please report to xorg-driver-ati@lists.x.org\n");
+               }
                DRM_INFO("  Encoders:\n");
                list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                        radeon_encoder = to_radeon_encoder(encoder);