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Wysocki" , Prashant Malani , Benson Leung , Guenter Roeck Cc: linux-kernel@vger.kernel.org, =?utf-8?q?N=C3=ADcolas_F_=2E_R_=2E_A_=2E_P?= =?utf-8?q?rado?= , Hsin-Yi Wang , devicetree@vger.kernel.org, Pin-yen Lin , Allen Chen , Lyude Paul , linux-acpi@vger.kernel.org, dri-devel@lists.freedesktop.org, Marek Vasut , Xin Ji , Stephen Boyd , AngeloGioacchino Del Regno , Thomas Zimmermann , Javier Martinez Canillas , chrome-platform@lists.linux.dev, Alex Deucher , Andi Shyti , Douglas Anderson , "Gustavo A. R. Silva" , Imre Deak , Jani Nikula , Kees Cook , Thierry Reding Subject: [PATCH v11 3/9] drm/display: Add Type-C switch helpers Date: Sat, 4 Feb 2023 21:30:34 +0800 Message-Id: <20230204133040.1236799-4-treapking@chromium.org> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog In-Reply-To: <20230204133040.1236799-1-treapking@chromium.org> References: <20230204133040.1236799-1-treapking@chromium.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 "reg" properties are available in Device Tree. Signed-off-by: Pin-yen Lin --- Changes in v11: - Use fwnode helpers instead of DT - Moved the helpers to a new file - Use "reg" instead of "data-lanes" to determine the port number - Dropped collected tags due to new changes Changes in v10: - Collected Reviewed-by and Tested-by tags - Replaced "void *" with "typec_mux_set_fn_t" for mux_set callbacks - Print out the node name when errors on parsing DT - Use dev_dbg instead of dev_warn when no Type-C switch nodes available - Made the return path of drm_dp_register_mode_switch clearer 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/Makefile | 1 + drivers/gpu/drm/display/drm_dp_typec_helper.c | 114 ++++++++++++++++++ include/drm/display/drm_dp_helper.h | 31 +++++ 3 files changed, 146 insertions(+) create mode 100644 drivers/gpu/drm/display/drm_dp_typec_helper.c diff --git a/drivers/gpu/drm/display/Makefile b/drivers/gpu/drm/display/Makefile index 17ac4a1006a8..ef80b9fde615 100644 --- a/drivers/gpu/drm/display/Makefile +++ b/drivers/gpu/drm/display/Makefile @@ -14,5 +14,6 @@ drm_display_helper-$(CONFIG_DRM_DISPLAY_HDMI_HELPER) += \ drm_scdc_helper.o drm_display_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o drm_display_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o +drm_display_helper-$(CONFIG_TYPEC) += drm_dp_typec_helper.o obj-$(CONFIG_DRM_DISPLAY_HELPER) += drm_display_helper.o diff --git a/drivers/gpu/drm/display/drm_dp_typec_helper.c b/drivers/gpu/drm/display/drm_dp_typec_helper.c new file mode 100644 index 000000000000..b11a268da57f --- /dev/null +++ b/drivers/gpu/drm/display/drm_dp_typec_helper.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +static int drm_dp_register_mode_switch(struct device *dev, + struct fwnode_handle *fwnode, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, typec_mux_set_fn_t mux_set) +{ + struct drm_dp_typec_port_data *port_data; + struct typec_mux_desc mux_desc = {}; + char name[32]; + u32 port_num; + int ret; + + ret = fwnode_property_read_u32(fwnode, "reg", &port_num); + if (ret) { + dev_err(dev, "Failed to read reg property: %d\n", ret); + return ret; + } + + port_data = &switch_desc->typec_ports[port_num]; + port_data->data = data; + port_data->port_num = port_num; + port_data->fwnode = fwnode; + mux_desc.fwnode = fwnode; + mux_desc.drvdata = port_data; + snprintf(name, sizeof(name), "%pfwP-%u", fwnode, 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; + } + + return 0; +} + +/** + * 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. + * The port number is determined by the "reg" property of the endpoint. + */ +int drm_dp_register_typec_switches(struct device *dev, struct fwnode_handle *port, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, typec_mux_set_fn_t mux_set) +{ + struct fwnode_handle *sw; + int ret; + + fwnode_for_each_child_node(port, sw) { + if (fwnode_property_present(sw, "mode-switch")) + switch_desc->num_typec_switches++; + } + + if (!switch_desc->num_typec_switches) { + dev_dbg(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. */ + fwnode_for_each_child_node(port, sw) { + if (!fwnode_property_present(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: + fwnode_handle_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); diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index ab55453f2d2c..d9213739de72 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -25,6 +25,7 @@ #include #include +#include #include #include @@ -763,4 +764,34 @@ 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; + int port_num; + struct fwnode_handle *fwnode; + void *data; +}; + +struct drm_dp_typec_switch_desc { + int num_typec_switches; + struct drm_dp_typec_port_data *typec_ports; +}; + +#ifdef CONFIG_TYPEC +void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc); +int drm_dp_register_typec_switches(struct device *dev, struct fwnode_handle *port, + struct drm_dp_typec_switch_desc *switch_desc, + void *data, typec_mux_set_fn_t mux_set); +#else +static inline void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc) +{ +} +static inline int drm_dp_register_typec_switches( + struct device *dev, struct fwnode_handle *port, + struct drm_dp_typec_switch_desc *switch_desc, void *data, + typec_mux_set_fn_t mux_set) +{ + return -EOPNOTSUPP; +} +#endif + #endif /* _DRM_DP_HELPER_H_ */