| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2019 Renesas Electronics Corporation |
| * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
| */ |
| |
| #include <linux/gpio/consumer.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_graph.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/consumer.h> |
| |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_bridge.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_panel.h> |
| |
| struct lvds_codec { |
| struct device *dev; |
| struct drm_bridge bridge; |
| struct drm_bridge *panel_bridge; |
| struct drm_bridge_timings timings; |
| struct regulator *vcc; |
| struct gpio_desc *powerdown_gpio; |
| u32 connector_type; |
| unsigned int bus_format; |
| }; |
| |
| static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge) |
| { |
| return container_of(bridge, struct lvds_codec, bridge); |
| } |
| |
| static int lvds_codec_attach(struct drm_bridge *bridge, |
| enum drm_bridge_attach_flags flags) |
| { |
| struct lvds_codec *lvds_codec = to_lvds_codec(bridge); |
| |
| return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge, |
| bridge, flags); |
| } |
| |
| static void lvds_codec_enable(struct drm_bridge *bridge) |
| { |
| struct lvds_codec *lvds_codec = to_lvds_codec(bridge); |
| int ret; |
| |
| ret = regulator_enable(lvds_codec->vcc); |
| if (ret) { |
| dev_err(lvds_codec->dev, |
| "Failed to enable regulator \"vcc\": %d\n", ret); |
| return; |
| } |
| |
| if (lvds_codec->powerdown_gpio) |
| gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0); |
| } |
| |
| static void lvds_codec_disable(struct drm_bridge *bridge) |
| { |
| struct lvds_codec *lvds_codec = to_lvds_codec(bridge); |
| int ret; |
| |
| if (lvds_codec->powerdown_gpio) |
| gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1); |
| |
| ret = regulator_disable(lvds_codec->vcc); |
| if (ret) |
| dev_err(lvds_codec->dev, |
| "Failed to disable regulator \"vcc\": %d\n", ret); |
| } |
| |
| static const struct drm_bridge_funcs funcs = { |
| .attach = lvds_codec_attach, |
| .enable = lvds_codec_enable, |
| .disable = lvds_codec_disable, |
| }; |
| |
| #define MAX_INPUT_SEL_FORMATS 1 |
| static u32 * |
| lvds_codec_atomic_get_input_bus_fmts(struct drm_bridge *bridge, |
| struct drm_bridge_state *bridge_state, |
| struct drm_crtc_state *crtc_state, |
| struct drm_connector_state *conn_state, |
| u32 output_fmt, |
| unsigned int *num_input_fmts) |
| { |
| struct lvds_codec *lvds_codec = to_lvds_codec(bridge); |
| u32 *input_fmts; |
| |
| *num_input_fmts = 0; |
| |
| input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts), |
| GFP_KERNEL); |
| if (!input_fmts) |
| return NULL; |
| |
| input_fmts[0] = lvds_codec->bus_format; |
| *num_input_fmts = MAX_INPUT_SEL_FORMATS; |
| |
| return input_fmts; |
| } |
| |
| static const struct drm_bridge_funcs funcs_decoder = { |
| .attach = lvds_codec_attach, |
| .enable = lvds_codec_enable, |
| .disable = lvds_codec_disable, |
| .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, |
| .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, |
| .atomic_reset = drm_atomic_helper_bridge_reset, |
| .atomic_get_input_bus_fmts = lvds_codec_atomic_get_input_bus_fmts, |
| }; |
| |
| static int lvds_codec_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *panel_node; |
| struct device_node *bus_node; |
| struct drm_panel *panel; |
| struct lvds_codec *lvds_codec; |
| u32 val; |
| int ret; |
| |
| lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL); |
| if (!lvds_codec) |
| return -ENOMEM; |
| |
| lvds_codec->dev = &pdev->dev; |
| lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev); |
| |
| lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "power"); |
| if (IS_ERR(lvds_codec->vcc)) |
| return dev_err_probe(dev, PTR_ERR(lvds_codec->vcc), |
| "Unable to get \"vcc\" supply\n"); |
| |
| lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown", |
| GPIOD_OUT_HIGH); |
| if (IS_ERR(lvds_codec->powerdown_gpio)) |
| return dev_err_probe(dev, PTR_ERR(lvds_codec->powerdown_gpio), |
| "powerdown GPIO failure\n"); |
| |
| /* Locate the panel DT node. */ |
| panel_node = of_graph_get_remote_node(dev->of_node, 1, 0); |
| if (!panel_node) { |
| dev_dbg(dev, "panel DT node not found\n"); |
| return -ENXIO; |
| } |
| |
| panel = of_drm_find_panel(panel_node); |
| of_node_put(panel_node); |
| if (IS_ERR(panel)) { |
| dev_dbg(dev, "panel not found, deferring probe\n"); |
| return PTR_ERR(panel); |
| } |
| |
| lvds_codec->panel_bridge = |
| devm_drm_panel_bridge_add_typed(dev, panel, |
| lvds_codec->connector_type); |
| if (IS_ERR(lvds_codec->panel_bridge)) |
| return PTR_ERR(lvds_codec->panel_bridge); |
| |
| lvds_codec->bridge.funcs = &funcs; |
| |
| /* |
| * Decoder input LVDS format is a property of the decoder chip or even |
| * its strapping. Handle data-mapping the same way lvds-panel does. In |
| * case data-mapping is not present, do nothing, since there are still |
| * legacy bindings which do not specify this property. |
| */ |
| if (lvds_codec->connector_type != DRM_MODE_CONNECTOR_LVDS) { |
| bus_node = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0); |
| if (!bus_node) { |
| dev_dbg(dev, "bus DT node not found\n"); |
| return -ENXIO; |
| } |
| |
| ret = drm_of_lvds_get_data_mapping(bus_node); |
| of_node_put(bus_node); |
| if (ret == -ENODEV) { |
| dev_warn(dev, "missing 'data-mapping' DT property\n"); |
| } else if (ret < 0) { |
| dev_err(dev, "invalid 'data-mapping' DT property\n"); |
| return ret; |
| } else { |
| lvds_codec->bus_format = ret; |
| lvds_codec->bridge.funcs = &funcs_decoder; |
| } |
| } |
| |
| /* |
| * Encoder might sample data on different clock edge than the display, |
| * for example OnSemi FIN3385 has a dedicated strapping pin to select |
| * the sampling edge. |
| */ |
| if (lvds_codec->connector_type == DRM_MODE_CONNECTOR_LVDS && |
| !of_property_read_u32(dev->of_node, "pclk-sample", &val)) { |
| lvds_codec->timings.input_bus_flags = val ? |
| DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE : |
| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; |
| } |
| |
| /* |
| * The panel_bridge bridge is attached to the panel's of_node, |
| * but we need a bridge attached to our of_node for our user |
| * to look up. |
| */ |
| lvds_codec->bridge.of_node = dev->of_node; |
| lvds_codec->bridge.timings = &lvds_codec->timings; |
| drm_bridge_add(&lvds_codec->bridge); |
| |
| platform_set_drvdata(pdev, lvds_codec); |
| |
| return 0; |
| } |
| |
| static void lvds_codec_remove(struct platform_device *pdev) |
| { |
| struct lvds_codec *lvds_codec = platform_get_drvdata(pdev); |
| |
| drm_bridge_remove(&lvds_codec->bridge); |
| } |
| |
| static const struct of_device_id lvds_codec_match[] = { |
| { |
| .compatible = "lvds-decoder", |
| .data = (void *)DRM_MODE_CONNECTOR_DPI, |
| }, |
| { |
| .compatible = "lvds-encoder", |
| .data = (void *)DRM_MODE_CONNECTOR_LVDS, |
| }, |
| { |
| .compatible = "thine,thc63lvdm83d", |
| .data = (void *)DRM_MODE_CONNECTOR_LVDS, |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, lvds_codec_match); |
| |
| static struct platform_driver lvds_codec_driver = { |
| .probe = lvds_codec_probe, |
| .remove_new = lvds_codec_remove, |
| .driver = { |
| .name = "lvds-codec", |
| .of_match_table = lvds_codec_match, |
| }, |
| }; |
| module_platform_driver(lvds_codec_driver); |
| |
| MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); |
| MODULE_DESCRIPTION("LVDS encoders and decoders"); |
| MODULE_LICENSE("GPL"); |