drm/radeon/kms: fix support for original r100

Original radeon didn't have a connector table in the
bios.  Check for the CRT table and if we have one,
add a VGA connector.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 3c402b957f0..8298c990be7 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -1773,8 +1773,25 @@ bool radeon_get_legacy_connector_info_from_bios(struct drm_device *dev)
                                                     DRM_MODE_CONNECTOR_DVII,
                                                     &ddc_i2c);
                 } else {
-                        DRM_DEBUG("No connector info found\n");
-                        return false;
+                        uint16_t crt_info =
+                                combios_get_table_offset(dev, COMBIOS_CRT_INFO_TABLE);
+                        DRM_DEBUG("Found CRT table, assuming VGA connector\n");
+                        if (crt_info) {
+                                radeon_add_legacy_encoder(dev,
+                                                          radeon_get_encoder_id(dev,
+                                                                                ATOM_DEVICE_CRT1_SUPPORT,
+                                                                                1),
+                                                          ATOM_DEVICE_CRT1_SUPPORT);
+                                ddc_i2c = combios_setup_i2c_bus(RADEON_GPIO_VGA_DDC);
+                                radeon_add_legacy_connector(dev,
+                                                            0,
+                                                            ATOM_DEVICE_CRT1_SUPPORT,
+                                                            DRM_MODE_CONNECTOR_VGA,
+                                                            &ddc_i2c);
+                        } else {
+                                DRM_DEBUG("No connector info found\n");
+                                return false;
+                        }
                 }
         }