drm/radeon/kms: fix support for DDC on dp bridges

Need to set up the bridge for DDC prior to the
i2c over aux transaction.

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

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index dc7852b..613e36f 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -44,6 +44,8 @@ extern void
 radeon_legacy_backlight_init(struct radeon_encoder *radeon_encoder,
                             struct drm_connector *drm_connector);
 
+bool radeon_connector_encoder_is_dp_bridge(struct drm_connector *connector);
+
 void radeon_connector_hotplug(struct drm_connector *connector)
 {
        struct drm_device *dev = connector->dev;
@@ -1070,10 +1072,10 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
 {
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
+       struct drm_encoder *encoder = radeon_best_single_encoder(connector);
        int ret;
 
        if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
-               struct drm_encoder *encoder;
                struct drm_display_mode *mode;
 
                if (!radeon_dig_connector->edp_on)
@@ -1085,7 +1087,6 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
                                                     ATOM_TRANSMITTER_ACTION_POWER_OFF);
 
                if (ret > 0) {
-                       encoder = radeon_best_single_encoder(connector);
                        if (encoder) {
                                radeon_fixup_lvds_native_mode(encoder, connector);
                                /* add scaled modes */
@@ -1109,8 +1110,14 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
                        /* add scaled modes */
                        radeon_add_common_modes(encoder, connector);
                }
-       } else
+       } else {
+               /* need to setup ddc on the bridge */
+               if (radeon_connector_encoder_is_dp_bridge(connector)) {
+                       if (encoder)
+                               radeon_atom_ext_encoder_setup_ddc(encoder);
+               }
                ret = radeon_ddc_get_modes(radeon_connector);
+       }
 
        return ret;
 }
@@ -1194,6 +1201,7 @@ radeon_dp_detect(struct drm_connector *connector, bool force)
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        enum drm_connector_status ret = connector_status_disconnected;
        struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
+       struct drm_encoder *encoder = radeon_best_single_encoder(connector);
 
        if (radeon_connector->edid) {
                kfree(radeon_connector->edid);
@@ -1201,7 +1209,6 @@ radeon_dp_detect(struct drm_connector *connector, bool force)
        }
 
        if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
-               struct drm_encoder *encoder = radeon_best_single_encoder(connector);
                if (encoder) {
                        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
                        struct drm_display_mode *native_mode = &radeon_encoder->native_mode;
@@ -1221,6 +1228,11 @@ radeon_dp_detect(struct drm_connector *connector, bool force)
                        atombios_set_edp_panel_power(connector,
                                                     ATOM_TRANSMITTER_ACTION_POWER_OFF);
        } else {
+               /* need to setup ddc on the bridge */
+               if (radeon_connector_encoder_is_dp_bridge(connector)) {
+                       if (encoder)
+                               radeon_atom_ext_encoder_setup_ddc(encoder);
+               }
                radeon_dig_connector->dp_sink_type = radeon_dp_getsinktype(radeon_connector);
                if (radeon_hpd_sense(rdev, radeon_connector->hpd.hpd)) {
                        ret = connector_status_connected;

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index d344944..8e058f1 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -2046,6 +2046,18 @@ radeon_atom_dig_detect(struct drm_encoder *encoder, struct drm_connector *connec
        return connector_status_disconnected;
 }
 
+void
+radeon_atom_ext_encoder_setup_ddc(struct drm_encoder *encoder)
+{
+       struct drm_encoder *ext_encoder = radeon_atom_get_external_encoder(encoder);
+
+       if (ext_encoder)
+               /* ddc_setup on the dp bridge */
+               atombios_external_encoder_setup(encoder, ext_encoder,
+                                               EXTERNAL_ENCODER_ACTION_V3_DDC_SETUP);
+
+}
+
 static void radeon_atom_encoder_prepare(struct drm_encoder *encoder)
 {
        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 977a341..f734b37 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -483,6 +483,7 @@ extern void radeon_atom_encoder_init(struct radeon_device *rdev);
 extern void atombios_dig_transmitter_setup(struct drm_encoder *encoder,
                                           int action, uint8_t lane_num,
                                           uint8_t lane_set);
+extern void radeon_atom_ext_encoder_setup_ddc(struct drm_encoder *encoder);
 extern int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
                                u8 write_byte, u8 *read_byte);