drm/radeon/kms: enable hpd support

[safe/jmp/linux-2.6] / drivers / gpu / drm / radeon / atombios_dp.c

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 784ba80..0d63c44 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -507,6 +507,18 @@ static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
        return true;
 }
 
+bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
+{
+       struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+       u8 link_status[DP_LINK_STATUS_SIZE];
+
+       if (!atom_dp_get_link_status(radeon_connector, link_status))
+               return false;
+       if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
+               return false;
+       return true;
+}
+
 static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
 {
        struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;