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Wysocki" , Prashant Malani , Benson Leung , Guenter Roeck Subject: [PATCH v8 3/9] drm/display: Add Type-C switch helpers Date: Sat, 7 Jan 2023 18:22:25 +0800 Message-Id: <20230107102231.23682-4-treapking@chromium.org> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog In-Reply-To: <20230107102231.23682-1-treapking@chromium.org> References: <20230107102231.23682-1-treapking@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Marek Vasut , chrome-platform@lists.linux.dev, Javier Martinez Canillas , linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, Kees Cook , =?utf-8?q?N?= =?utf-8?q?=C3=ADcolas_F_=2E_R_=2E_A_=2E_Prado?= , Jani Nikula , Allen Chen , Stephen Boyd , Pin-yen Lin , Hsin-Yi Wang , Xin Ji , AngeloGioacchino Del Regno , Douglas Anderson , Thomas Zimmermann Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add helpers to register and unregister Type-C "switches" for bridges capable of switching their output between two downstream devices. The helper registers USB Type-C mode switches when the "mode-switch" and the "data-lanes" properties are available in Device Tree. Signed-off-by: Pin-yen Lin --- Changes in v8: - Fixed the build issue when CONFIG_TYPEC=m - Fixed some style issues Changes in v7: - Extracted the common codes to a helper function - New in v7 drivers/gpu/drm/display/drm_dp_helper.c | 132 ++++++++++++++++++++++++ include/drm/display/drm_dp_helper.h | 16 +++ 2 files changed, 148 insertions(+) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 16565a0a5da6..fb9e23744c08 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -30,11 +30,13 @@ #include #include #include +#include #include #include #include #include +#include #include #include #include @@ -3891,3 +3893,133 @@ int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux) EXPORT_SYMBOL(drm_panel_dp_aux_backlight); #endif + +#if IS_REACHABLE(CONFIG_TYPEC) +static int drm_dp_register_mode_switch(struct device *dev, struct device_node *node, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, void *mux_set) +{ + struct drm_dp_typec_port_data *port_data; + struct typec_mux_desc mux_desc = {}; + char name[32]; + u32 dp_lanes[2]; + int ret, num_lanes, port_num = -1; + + num_lanes = drm_of_get_data_lanes_count(node, 0, 2); + if (num_lanes <= 0) { + dev_err(dev, "Error on getting data lanes count: %d\n", + num_lanes); + return num_lanes; + } + + ret = of_property_read_u32_array(node, "data-lanes", dp_lanes, num_lanes); + if (ret) { + dev_err(dev, "Failed to read the data-lanes variable: %d\n", + ret); + return ret; + } + + port_num = dp_lanes[0] / 2; + + port_data = &switch_desc->typec_ports[port_num]; + port_data->data = data; + mux_desc.fwnode = &node->fwnode; + mux_desc.drvdata = port_data; + snprintf(name, sizeof(name), "%s-%u", node->name, port_num); + mux_desc.name = name; + mux_desc.set = mux_set; + + port_data->typec_mux = typec_mux_register(dev, &mux_desc); + if (IS_ERR(port_data->typec_mux)) { + ret = PTR_ERR(port_data->typec_mux); + dev_err(dev, "Mode switch register for port %d failed: %d\n", + port_num, ret); + } + + return ret; +} + +/** + * drm_dp_register_typec_switches() - register Type-C switches + * @dev: Device that registers Type-C switches + * @port: Device node for the switch + * @switch_desc: A Type-C switch descriptor + * @data: Private data for the switches + * @mux_set: Callback function for typec_mux_set + * + * This function registers USB Type-C switches for DP bridges that can switch + * the output signal between their output pins. + * + * Currently only mode switches are implemented, and the function assumes the + * given @port device node has endpoints with "mode-switch" property. + * Register the endpoint as port 0 if the "data-lanes" property falls in 0/1, + * and register it as port 1 if "data-lanes" falls in 2/3. + */ +int drm_dp_register_typec_switches(struct device *dev, struct device_node *port, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, void *mux_set) +{ + struct device_node *sw; + int ret; + + for_each_child_of_node(port, sw) { + if (of_property_read_bool(sw, "mode-switch")) + switch_desc->num_typec_switches++; + } + + if (!switch_desc->num_typec_switches) { + dev_warn(dev, "No Type-C switches node found\n"); + return 0; + } + + switch_desc->typec_ports = devm_kcalloc( + dev, switch_desc->num_typec_switches, + sizeof(struct drm_dp_typec_port_data), GFP_KERNEL); + + if (!switch_desc->typec_ports) + return -ENOMEM; + + /* Register switches for each connector. */ + for_each_child_of_node(port, sw) { + if (!of_property_read_bool(sw, "mode-switch")) + continue; + ret = drm_dp_register_mode_switch(dev, sw, switch_desc, data, mux_set); + if (ret) + goto err_unregister_typec_switches; + } + + return 0; + +err_unregister_typec_switches: + of_node_put(sw); + drm_dp_unregister_typec_switches(switch_desc); + dev_err(dev, "Failed to register mode switch: %d\n", ret); + return ret; +} +EXPORT_SYMBOL(drm_dp_register_typec_switches); + +/** + * drm_dp_unregister_typec_switches() - unregister Type-C switches + * @switch_desc: A Type-C switch descriptor + */ +void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc) +{ + int i; + + for (i = 0; i < switch_desc->num_typec_switches; i++) + typec_mux_unregister(switch_desc->typec_ports[i].typec_mux); +} +EXPORT_SYMBOL(drm_dp_unregister_typec_switches); +#else +void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc) +{ +} +EXPORT_SYMBOL(drm_dp_register_typec_switches); +int drm_dp_register_typec_switches(struct device *dev, struct device_node *port, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, void *mux_set) +{ + return 0; +} +EXPORT_SYMBOL(drm_dp_unregister_typec_switches); +#endif diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index ab55453f2d2c..fef0a9a0d8ea 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -763,4 +763,20 @@ bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZ const u8 port_cap[4], u8 color_spc); int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc); +struct drm_dp_typec_port_data { + struct typec_mux_dev *typec_mux; + void *data; + bool dp_connected; +}; + +struct drm_dp_typec_switch_desc { + int num_typec_switches; + struct drm_dp_typec_port_data *typec_ports; +}; + +void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc); +int drm_dp_register_typec_switches(struct device *dev, struct device_node *port, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, void *mux_set); + #endif /* _DRM_DP_HELPER_H_ */