drm/radeon/kms: add support for router objects

router objects are found on systems that use a mux to control
ddc line to connector routing or to control the actual clock and data
routing from the chip to the connectors.  This patch implements ddc line
routing.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -48,7 +48,8 @@ radeon_add_atom_connector(struct drm_device *dev,
 			  struct radeon_i2c_bus_rec *i2c_bus,
 			  bool linkb, uint32_t igp_lane_info,
 			  uint16_t connector_object_id,
-			  struct radeon_hpd *hpd);
+			  struct radeon_hpd *hpd,
+			  struct radeon_router *router);
 
 /* from radeon_legacy_encoder.c */
 extern void
@@ -460,13 +461,15 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 	u16 size, data_offset;
 	u8 frev, crev;
 	ATOM_CONNECTOR_OBJECT_TABLE *con_obj;
+	ATOM_OBJECT_TABLE *router_obj;
 	ATOM_DISPLAY_OBJECT_PATH_TABLE *path_obj;
 	ATOM_OBJECT_HEADER *obj_header;
-	int i, j, path_size, device_support;
+	int i, j, k, path_size, device_support;
 	int connector_type;
 	u16 igp_lane_info, conn_id, connector_object_id;
 	bool linkb;
 	struct radeon_i2c_bus_rec ddc_bus;
+	struct radeon_router router;
 	struct radeon_gpio_rec gpio;
 	struct radeon_hpd hpd;
 
@@ -476,6 +479,8 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 	if (crev < 2)
 		return false;
 
+	router.valid = false;
+
 	obj_header = (ATOM_OBJECT_HEADER *) (ctx->bios + data_offset);
 	path_obj = (ATOM_DISPLAY_OBJECT_PATH_TABLE *)
 	    (ctx->bios + data_offset +
@@ -483,6 +488,9 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 	con_obj = (ATOM_CONNECTOR_OBJECT_TABLE *)
 	    (ctx->bios + data_offset +
 	     le16_to_cpu(obj_header->usConnectorObjectTableOffset));
+	router_obj = (ATOM_OBJECT_TABLE *)
+		(ctx->bios + data_offset +
+		 le16_to_cpu(obj_header->usRouterObjectTableOffset));
 	device_support = le16_to_cpu(obj_header->usDeviceSupport);
 
 	path_size = 0;
@@ -569,33 +577,86 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 			if (connector_type == DRM_MODE_CONNECTOR_Unknown)
 				continue;
 
-			for (j = 0; j < ((le16_to_cpu(path->usSize) - 8) / 2);
-			     j++) {
-				uint8_t enc_obj_id, enc_obj_num, enc_obj_type;
+			for (j = 0; j < ((le16_to_cpu(path->usSize) - 8) / 2); j++) {
+				uint8_t grph_obj_id, grph_obj_num, grph_obj_type;
 
-				enc_obj_id =
+				grph_obj_id =
 				    (le16_to_cpu(path->usGraphicObjIds[j]) &
 				     OBJECT_ID_MASK) >> OBJECT_ID_SHIFT;
-				enc_obj_num =
+				grph_obj_num =
 				    (le16_to_cpu(path->usGraphicObjIds[j]) &
 				     ENUM_ID_MASK) >> ENUM_ID_SHIFT;
-				enc_obj_type =
+				grph_obj_type =
 				    (le16_to_cpu(path->usGraphicObjIds[j]) &
 				     OBJECT_TYPE_MASK) >> OBJECT_TYPE_SHIFT;
 
-				/* FIXME: add support for router objects */
-				if (enc_obj_type == GRAPH_OBJECT_TYPE_ENCODER) {
-					if (enc_obj_num == 2)
+				if (grph_obj_type == GRAPH_OBJECT_TYPE_ENCODER) {
+					if (grph_obj_num == 2)
 						linkb = true;
 					else
 						linkb = false;
 
 					radeon_add_atom_encoder(dev,
-								enc_obj_id,
+								grph_obj_id,
 								le16_to_cpu
 								(path->
 								 usDeviceTag));
 
+				} else if (grph_obj_type == GRAPH_OBJECT_TYPE_ROUTER) {
+					router.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) {
+							ATOM_COMMON_RECORD_HEADER *record = (ATOM_COMMON_RECORD_HEADER *)
+								(ctx->bios + data_offset +
+								 le16_to_cpu(router_obj->asObjects[k].usRecordOffset));
+							ATOM_I2C_RECORD *i2c_record;
+							ATOM_I2C_ID_CONFIG_ACCESS *i2c_config;
+							ATOM_ROUTER_DDC_PATH_SELECT_RECORD *ddc_path;
+							ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT *router_src_dst_table =
+								(ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT *)
+								(ctx->bios + data_offset +
+								 le16_to_cpu(router_obj->asObjects[k].usSrcDstTableOffset));
+							int enum_id;
+
+							router.router_id = router_obj_id;
+							for (enum_id = 0; enum_id < router_src_dst_table->ucNumberOfDst;
+							     enum_id++) {
+								if (le16_to_cpu(path->usConnObjectId) ==
+								    le16_to_cpu(router_src_dst_table->usDstObjectID[enum_id]))
+									break;
+							}
+
+							while (record->ucRecordType > 0 &&
+							       record->ucRecordType <= ATOM_MAX_OBJECT_RECORD_NUMBER) {
+								switch (record->ucRecordType) {
+								case ATOM_I2C_RECORD_TYPE:
+									i2c_record =
+										(ATOM_I2C_RECORD *)
+										record;
+									i2c_config =
+										(ATOM_I2C_ID_CONFIG_ACCESS *)
+										&i2c_record->sucI2cId;
+									router.i2c_info =
+										radeon_lookup_i2c_gpio(rdev,
+												       i2c_config->
+												       ucAccess);
+									router.i2c_addr = i2c_record->ucI2CAddr >> 1;
+									break;
+								case ATOM_ROUTER_DDC_PATH_SELECT_RECORD_TYPE:
+									ddc_path = (ATOM_ROUTER_DDC_PATH_SELECT_RECORD *)
+										record;
+									router.valid = true;
+									router.mux_type = ddc_path->ucMuxType;
+									router.mux_control_pin = ddc_path->ucMuxControlPin;
+									router.mux_state = ddc_path->ucMuxState[enum_id];
+									break;
+								}
+								record = (ATOM_COMMON_RECORD_HEADER *)
+									((char *)record + record->ucRecordSize);
+							}
+						}
+					}
 				}
 			}
 
@@ -675,7 +736,8 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 						  connector_type, &ddc_bus,
 						  linkb, igp_lane_info,
 						  connector_object_id,
-						  &hpd);
+						  &hpd,
+						  &router);
 
 		}
 	}
@@ -752,6 +814,9 @@ bool radeon_get_atom_connector_info_from_supported_devices_table(struct
 	int i, j, max_device;
 	struct bios_connector *bios_connectors;
 	size_t bc_size = sizeof(*bios_connectors) * ATOM_MAX_SUPPORTED_DEVICE;
+	struct radeon_router router;
+
+	router.valid = false;
 
 	bios_connectors = kzalloc(bc_size, GFP_KERNEL);
 	if (!bios_connectors)
@@ -923,7 +988,8 @@ bool radeon_get_atom_connector_info_from_supported_devices_table(struct
 						  &bios_connectors[i].ddc_bus,
 						  false, 0,
 						  connector_object_id,
-						  &bios_connectors[i].hpd);
+						  &bios_connectors[i].hpd,
+						  &router);
 		}
 	}
 

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -1040,7 +1040,8 @@ radeon_add_atom_connector(struct drm_device *dev,
 			  bool linkb,
 			  uint32_t igp_lane_info,
 			  uint16_t connector_object_id,
-			  struct radeon_hpd *hpd)
+			  struct radeon_hpd *hpd,
+			  struct radeon_router *router)
 {
 	struct radeon_device *rdev = dev->dev_private;
 	struct drm_connector *connector;
@@ -1065,6 +1066,11 @@ radeon_add_atom_connector(struct drm_device *dev,
 				radeon_connector->shared_ddc = true;
 				shared_ddc = true;
 			}
+			if (radeon_connector->router_bus && router->valid &&
+			    (radeon_connector->router.router_id == router->router_id)) {
+				radeon_connector->shared_ddc = false;
+				shared_ddc = false;
+			}
 		}
 	}
 
@@ -1079,6 +1085,12 @@ radeon_add_atom_connector(struct drm_device *dev,
 	radeon_connector->shared_ddc = shared_ddc;
 	radeon_connector->connector_object_id = connector_object_id;
 	radeon_connector->hpd = *hpd;
+	radeon_connector->router = *router;
+	if (router->valid) {
+		radeon_connector->router_bus = radeon_i2c_lookup(rdev, &router->i2c_info);
+		if (!radeon_connector->router_bus)
+			goto failed;
+	}
 	switch (connector_type) {
 	case DRM_MODE_CONNECTOR_VGA:
 		drm_connector_init(dev, &radeon_connector->base, &radeon_vga_connector_funcs, connector_type);

drivers/gpu/drm/radeon/radeon_display.c

@@ -319,6 +319,10 @@ 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)
+				DRM_INFO("  DDC Router 0x%x/0x%x\n",
+					 radeon_connector->router.mux_control_pin,
+					 radeon_connector->router.mux_state);
 		} else {
 			if (connector->connector_type == DRM_MODE_CONNECTOR_VGA ||
 			    connector->connector_type == DRM_MODE_CONNECTOR_DVII ||
@@ -395,6 +399,10 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
 	struct radeon_device *rdev = dev->dev_private;
 	int ret = 0;
 
+	/* on hw with routers, select right port */
+	if (radeon_connector->router.valid)
+		radeon_router_select_port(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;
@@ -425,6 +433,10 @@ static int radeon_ddc_dump(struct drm_connector *connector)
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	int ret = 0;
 
+	/* on hw with routers, select right port */
+	if (radeon_connector->router.valid)
+		radeon_router_select_port(radeon_connector);
+
 	if (!radeon_connector->ddc_bus)
 		return -1;
 	edid = drm_get_edid(connector, &radeon_connector->ddc_bus->adapter);

drivers/gpu/drm/radeon/radeon_i2c.c

@@ -52,6 +52,10 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
 		}
 	};
 
+	/* on hw with routers, select right port */
+	if (radeon_connector->router.valid)
+		radeon_router_select_port(radeon_connector);
+
 	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
 	if (ret == 2)
 		return true;
@@ -1073,3 +1077,28 @@ void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
 			  addr, val);
 }
 
+/* router switching */
+void radeon_router_select_port(struct radeon_connector *radeon_connector)
+{
+	u8 val;
+
+	if (!radeon_connector->router.valid)
+		return;
+
+	radeon_i2c_get_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x3, &val);
+	val &= radeon_connector->router.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.mux_state;
+	radeon_i2c_put_byte(radeon_connector->router_bus,
+			    radeon_connector->router.i2c_addr,
+			    0x1, val);
+}
+

drivers/gpu/drm/radeon/radeon_mode.h

@@ -400,6 +400,16 @@ struct radeon_hpd {
 	struct radeon_gpio_rec gpio;
 };
 
+struct radeon_router {
+	bool valid;
+	u32 router_id;
+	struct radeon_i2c_bus_rec i2c_info;
+	u8 i2c_addr;
+	u8 mux_type;
+	u8 mux_control_pin;
+	u8 mux_state;
+};
+
 struct radeon_connector {
 	struct drm_connector base;
 	uint32_t connector_id;
@@ -415,6 +425,8 @@ struct radeon_connector {
 	bool dac_load_detect;
 	uint16_t connector_object_id;
 	struct radeon_hpd hpd;
+	struct radeon_router router;
+	struct radeon_i2c_chan *router_bus;
 };
 
 struct radeon_framebuffer {
@@ -471,6 +483,7 @@ 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 bool radeon_ddc_probe(struct radeon_connector *radeon_connector);
 extern int radeon_ddc_get_modes(struct radeon_connector *radeon_connector);