drm/radeon/kms: fix displayport->dvi connector DDC.

It appears that attempting AUXCH DDC breaks the subsequent attempt
to do DDC over the i2c lines, so use the sink type to determine
if we should be doing AUXCH or i2c DDC.

This fixes my DVI monitor plugged into DP->DVI convertor.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 0ec491ead2ffd49a7169449acad83397192e55e2..47ceae9cdc4311865cf40bd641eeb9a69e160e5a 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -357,7 +357,8 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
        if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
            (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)) {
                struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
-               if (dig->dp_i2c_bus)
+               if ((dig->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT ||
+                    dig->dp_sink_type == CONNECTOR_OBJECT_ID_eDP) && dig->dp_i2c_bus)
                        radeon_connector->edid = drm_get_edid(&radeon_connector->base, &dig->dp_i2c_bus->adapter);
        }
        if (!radeon_connector->ddc_bus)