drm/radeon/kms: add support for clock/data path routers

This is a follow on to:
26b5bc9864
(drm/radeon/kms: add support for router objects)

That patch added support for systems that use a mux to control
the ddc line routing between the connectors.  This patch adds
support for systems that use a mux to control the encoder
clock and data path routing to the connectors.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=31339

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

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -526,7 +526,8 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 	if (crev < 2)
 		return false;
 
-	router.valid = false;
+	router.ddc_valid = false;
+	router.cd_valid = false;
 
 	obj_header = (ATOM_OBJECT_HEADER *) (ctx->bios + data_offset);
 	path_obj = (ATOM_DISPLAY_OBJECT_PATH_TABLE *)
@@ -647,7 +648,8 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 								 usDeviceTag));
 
 				} else if (grph_obj_type == GRAPH_OBJECT_TYPE_ROUTER) {
-					router.valid = false;
+					router.ddc_valid = false;
+					router.cd_valid = false;
 					for (k = 0; k < router_obj->ucNumberOfObjects; k++) {
 						u16 router_obj_id = le16_to_cpu(router_obj->asObjects[j].usObjectID);
 						if (le16_to_cpu(path->usGraphicObjIds[j]) == router_obj_id) {
@@ -657,6 +659,7 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 							ATOM_I2C_RECORD *i2c_record;
 							ATOM_I2C_ID_CONFIG_ACCESS *i2c_config;
 							ATOM_ROUTER_DDC_PATH_SELECT_RECORD *ddc_path;
+							ATOM_ROUTER_DATA_CLOCK_PATH_SELECT_RECORD *cd_path;
 							ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT *router_src_dst_table =
 								(ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT *)
 								(ctx->bios + data_offset +
@@ -690,10 +693,18 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 								case ATOM_ROUTER_DDC_PATH_SELECT_RECORD_TYPE:
 									ddc_path = (ATOM_ROUTER_DDC_PATH_SELECT_RECORD *)
 										record;
-									router.valid = true;
+									router.ddc_valid = true;
-									router.mux_type = ddc_path->ucMuxType;
+									router.ddc_mux_type = ddc_path->ucMuxType;
-									router.mux_control_pin = ddc_path->ucMuxControlPin;
+									router.ddc_mux_control_pin = ddc_path->ucMuxControlPin;
-									router.mux_state = ddc_path->ucMuxState[enum_id];
+									router.ddc_mux_state = ddc_path->ucMuxState[enum_id];
+									break;
+								case ATOM_ROUTER_DATA_CLOCK_PATH_SELECT_RECORD_TYPE:
+									cd_path = (ATOM_ROUTER_DATA_CLOCK_PATH_SELECT_RECORD *)
+										record;
+									router.cd_valid = true;
+									router.cd_mux_type = cd_path->ucMuxType;
+									router.cd_mux_control_pin = cd_path->ucMuxControlPin;
+									router.cd_mux_state = cd_path->ucMuxState[enum_id];
 									break;
 								}
 								record = (ATOM_COMMON_RECORD_HEADER *)
@@ -860,7 +871,8 @@ bool radeon_get_atom_connector_info_from_supported_devices_table(struct
 	size_t bc_size = sizeof(*bios_connectors) * ATOM_MAX_SUPPORTED_DEVICE;
 	struct radeon_router router;
 
-	router.valid = false;
+	router.ddc_valid = false;
+	router.cd_valid = false;
 
 	bios_connectors = kzalloc(bc_size, GFP_KERNEL);
 	if (!bios_connectors)

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -1116,7 +1116,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 				radeon_connector->shared_ddc = true;
 				shared_ddc = true;
 			}
-			if (radeon_connector->router_bus && router->valid &&
+			if (radeon_connector->router_bus && router->ddc_valid &&
 			    (radeon_connector->router.router_id == router->router_id)) {
 				radeon_connector->shared_ddc = false;
 				shared_ddc = false;
@@ -1136,7 +1136,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 	radeon_connector->connector_object_id = connector_object_id;
 	radeon_connector->hpd = *hpd;
 	radeon_connector->router = *router;
-	if (router->valid) {
+	if (router->ddc_valid || router->cd_valid) {
 		radeon_connector->router_bus = radeon_i2c_lookup(rdev, &router->i2c_info);
 		if (!radeon_connector->router_bus)
 			goto failed;

drivers/gpu/drm/radeon/radeon_display.c

@@ -315,10 +315,14 @@ 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);
-			if (radeon_connector->router_bus)
+			if (radeon_connector->router.ddc_valid)
 				DRM_INFO("  DDC Router 0x%x/0x%x\n",
-					 radeon_connector->router.mux_control_pin,
+					 radeon_connector->router.ddc_mux_control_pin,
-					 radeon_connector->router.mux_state);
+					 radeon_connector->router.ddc_mux_state);
+			if (radeon_connector->router.cd_valid)
+				DRM_INFO("  Clock/Data Router 0x%x/0x%x\n",
+					 radeon_connector->router.cd_mux_control_pin,
+					 radeon_connector->router.cd_mux_state);
 		} else {
 			if (connector->connector_type == DRM_MODE_CONNECTOR_VGA ||
 			    connector->connector_type == DRM_MODE_CONNECTOR_DVII ||
@@ -398,8 +402,8 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
 	int ret = 0;
 
 	/* on hw with routers, select right port */
-	if (radeon_connector->router.valid)
+	if (radeon_connector->router.ddc_valid)
-		radeon_router_select_port(radeon_connector);
+		radeon_router_select_ddc_port(radeon_connector);
 
 	if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
 	    (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)) {
@@ -432,8 +436,8 @@ static int radeon_ddc_dump(struct drm_connector *connector)
 	int ret = 0;
 
 	/* on hw with routers, select right port */
-	if (radeon_connector->router.valid)
+	if (radeon_connector->router.ddc_valid)
-		radeon_router_select_port(radeon_connector);
+		radeon_router_select_ddc_port(radeon_connector);
 
 	if (!radeon_connector->ddc_bus)
 		return -1;

drivers/gpu/drm/radeon/radeon_encoders.c

@@ -1520,6 +1520,7 @@ radeon_atom_dac_detect(struct drm_encoder *encoder, struct drm_connector *connec
 static void radeon_atom_encoder_prepare(struct drm_encoder *encoder)
 {
 	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+	struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
 
 	if (radeon_encoder->active_device &
 	    (ATOM_DEVICE_DFP_SUPPORT | ATOM_DEVICE_LCD_SUPPORT)) {
@@ -1531,6 +1532,13 @@ static void radeon_atom_encoder_prepare(struct drm_encoder *encoder)
 	radeon_atom_output_lock(encoder, true);
 	radeon_atom_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 
+	/* select the clock/data port if it uses a router */
+	if (connector) {
+		struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+		if (radeon_connector->router.cd_valid)
+			radeon_router_select_cd_port(radeon_connector);
+	}
+
 	/* this is needed for the pll/ss setup to work correctly in some cases */
 	atombios_set_encoder_crtc_source(encoder);
 }

drivers/gpu/drm/radeon/radeon_i2c.c

@@ -53,8 +53,8 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
 	};
 
 	/* on hw with routers, select right port */
-	if (radeon_connector->router.valid)
+	if (radeon_connector->router.ddc_valid)
-		radeon_router_select_port(radeon_connector);
+		radeon_router_select_ddc_port(radeon_connector);
 
 	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
 	if (ret == 2)
@@ -1084,26 +1084,51 @@ void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
 			  addr, val);
 }
 
-/* router switching */
+/* ddc router switching */
-void radeon_router_select_port(struct radeon_connector *radeon_connector)
+void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
 {
 	u8 val;
 
-	if (!radeon_connector->router.valid)
+	if (!radeon_connector->router.ddc_valid)
 		return;
 
 	radeon_i2c_get_byte(radeon_connector->router_bus,
 			    radeon_connector->router.i2c_addr,
 			    0x3, &val);
-	val &= radeon_connector->router.mux_control_pin;
+	val &= radeon_connector->router.ddc_mux_control_pin;
 	radeon_i2c_put_byte(radeon_connector->router_bus,
 			    radeon_connector->router.i2c_addr,
 			    0x3, val);
 	radeon_i2c_get_byte(radeon_connector->router_bus,
 			    radeon_connector->router.i2c_addr,
 			    0x1, &val);
-	val &= radeon_connector->router.mux_control_pin;
+	val &= radeon_connector->router.ddc_mux_control_pin;
-	val |= radeon_connector->router.mux_state;
+	val |= radeon_connector->router.ddc_mux_state;
+	radeon_i2c_put_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x1, val);
+}
+
+/* clock/data router switching */
+void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
+{
+	u8 val;
+
+	if (!radeon_connector->router.cd_valid)
+		return;
+
+	radeon_i2c_get_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x3, &val);
+	val &= radeon_connector->router.cd_mux_control_pin;
+	radeon_i2c_put_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x3, val);
+	radeon_i2c_get_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x1, &val);
+	val &= radeon_connector->router.cd_mux_control_pin;
+	val |= radeon_connector->router.cd_mux_state;
 	radeon_i2c_put_byte(radeon_connector->router_bus,
 			    radeon_connector->router.i2c_addr,
 			    0x1, val);

drivers/gpu/drm/radeon/radeon_mode.h

@@ -401,13 +401,19 @@ struct radeon_hpd {
 };
 
 struct radeon_router {
-	bool valid;
 	u32 router_id;
 	struct radeon_i2c_bus_rec i2c_info;
 	u8 i2c_addr;
-	u8 mux_type;
+	/* i2c mux */
-	u8 mux_control_pin;
+	bool ddc_valid;
-	u8 mux_state;
+	u8 ddc_mux_type;
+	u8 ddc_mux_control_pin;
+	u8 ddc_mux_state;
+	/* clock/data mux */
+	bool cd_valid;
+	u8 cd_mux_type;
+	u8 cd_mux_control_pin;
+	u8 cd_mux_state;
 };
 
 struct radeon_connector {
@@ -488,7 +494,8 @@ extern void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c,
 				u8 slave_addr,
 				u8 addr,
 				u8 val);
-extern void radeon_router_select_port(struct radeon_connector *radeon_connector);
+extern void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector);
+extern void radeon_router_select_cd_port(struct radeon_connector *radeon_connector);
 extern bool radeon_ddc_probe(struct radeon_connector *radeon_connector);
 extern int radeon_ddc_get_modes(struct radeon_connector *radeon_connector);