1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2019 Renesas Electronics Corporation 4 * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com> 5 */ 6 7#include <linux/gpio/consumer.h> 8#include <linux/media-bus-format.h> 9#include <linux/module.h> 10#include <linux/of.h> 11#include <linux/of_graph.h> 12#include <linux/platform_device.h> 13#include <linux/regulator/consumer.h> 14 15#include <drm/drm_atomic_helper.h> 16#include <drm/drm_bridge.h> 17#include <drm/drm_of.h> 18#include <drm/drm_panel.h> 19 20struct lvds_codec { 21 struct device *dev; 22 struct drm_bridge bridge; 23 struct drm_bridge *panel_bridge; 24 struct drm_bridge_timings timings; 25 struct regulator *vcc; 26 struct gpio_desc *powerdown_gpio; 27 u32 connector_type; 28 unsigned int bus_format; 29}; 30 31static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge) 32{ 33 return container_of(bridge, struct lvds_codec, bridge); 34} 35 36static int lvds_codec_attach(struct drm_bridge *bridge, 37 enum drm_bridge_attach_flags flags) 38{ 39 struct lvds_codec *lvds_codec = to_lvds_codec(bridge); 40 41 return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge, 42 bridge, flags); 43} 44 45static void lvds_codec_enable(struct drm_bridge *bridge) 46{ 47 struct lvds_codec *lvds_codec = to_lvds_codec(bridge); 48 int ret; 49 50 ret = regulator_enable(lvds_codec->vcc); 51 if (ret) { 52 dev_err(lvds_codec->dev, 53 "Failed to enable regulator \"vcc\": %d\n", ret); 54 return; 55 } 56 57 if (lvds_codec->powerdown_gpio) 58 gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0); 59} 60 61static void lvds_codec_disable(struct drm_bridge *bridge) 62{ 63 struct lvds_codec *lvds_codec = to_lvds_codec(bridge); 64 int ret; 65 66 if (lvds_codec->powerdown_gpio) 67 gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1); 68 69 ret = regulator_disable(lvds_codec->vcc); 70 if (ret) 71 dev_err(lvds_codec->dev, 72 "Failed to disable regulator \"vcc\": %d\n", ret); 73} 74 75#define MAX_INPUT_SEL_FORMATS 1 76static u32 * 77lvds_codec_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 78 struct drm_bridge_state *bridge_state, 79 struct drm_crtc_state *crtc_state, 80 struct drm_connector_state *conn_state, 81 u32 output_fmt, 82 unsigned int *num_input_fmts) 83{ 84 struct lvds_codec *lvds_codec = to_lvds_codec(bridge); 85 u32 *input_fmts; 86 87 *num_input_fmts = 0; 88 89 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts), 90 GFP_KERNEL); 91 if (!input_fmts) 92 return NULL; 93 94 input_fmts[0] = lvds_codec->bus_format; 95 *num_input_fmts = MAX_INPUT_SEL_FORMATS; 96 97 return input_fmts; 98} 99 100static const struct drm_bridge_funcs funcs = { 101 .attach = lvds_codec_attach, 102 .enable = lvds_codec_enable, 103 .disable = lvds_codec_disable, 104 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 105 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 106 .atomic_reset = drm_atomic_helper_bridge_reset, 107 .atomic_get_input_bus_fmts = lvds_codec_atomic_get_input_bus_fmts, 108}; 109 110static int lvds_codec_probe(struct platform_device *pdev) 111{ 112 struct device *dev = &pdev->dev; 113 struct device_node *panel_node; 114 struct device_node *bus_node; 115 struct drm_panel *panel; 116 struct lvds_codec *lvds_codec; 117 u32 val; 118 int ret; 119 120 lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL); 121 if (!lvds_codec) 122 return -ENOMEM; 123 124 lvds_codec->dev = &pdev->dev; 125 lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev); 126 127 lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "power"); 128 if (IS_ERR(lvds_codec->vcc)) 129 return dev_err_probe(dev, PTR_ERR(lvds_codec->vcc), 130 "Unable to get \"vcc\" supply\n"); 131 132 lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown", 133 GPIOD_OUT_HIGH); 134 if (IS_ERR(lvds_codec->powerdown_gpio)) 135 return dev_err_probe(dev, PTR_ERR(lvds_codec->powerdown_gpio), 136 "powerdown GPIO failure\n"); 137 138 /* Locate the panel DT node. */ 139 panel_node = of_graph_get_remote_node(dev->of_node, 1, 0); 140 if (!panel_node) { 141 dev_dbg(dev, "panel DT node not found\n"); 142 return -ENXIO; 143 } 144 145 panel = of_drm_find_panel(panel_node); 146 of_node_put(panel_node); 147 if (IS_ERR(panel)) { 148 dev_dbg(dev, "panel not found, deferring probe\n"); 149 return PTR_ERR(panel); 150 } 151 152 lvds_codec->panel_bridge = 153 devm_drm_panel_bridge_add_typed(dev, panel, 154 lvds_codec->connector_type); 155 if (IS_ERR(lvds_codec->panel_bridge)) 156 return PTR_ERR(lvds_codec->panel_bridge); 157 158 lvds_codec->bridge.funcs = &funcs; 159 160 /* 161 * Decoder input LVDS format is a property of the decoder chip or even 162 * its strapping. Handle data-mapping the same way lvds-panel does. In 163 * case data-mapping is not present, do nothing, since there are still 164 * legacy bindings which do not specify this property. 165 */ 166 if (lvds_codec->connector_type != DRM_MODE_CONNECTOR_LVDS) { 167 bus_node = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0); 168 if (!bus_node) { 169 dev_dbg(dev, "bus DT node not found\n"); 170 return -ENXIO; 171 } 172 173 ret = drm_of_lvds_get_data_mapping(bus_node); 174 of_node_put(bus_node); 175 if (ret == -ENODEV) { 176 dev_warn(dev, "missing 'data-mapping' DT property\n"); 177 } else if (ret < 0) { 178 dev_err(dev, "invalid 'data-mapping' DT property\n"); 179 return ret; 180 } else { 181 lvds_codec->bus_format = ret; 182 } 183 } else { 184 lvds_codec->bus_format = MEDIA_BUS_FMT_RGB888_1X24; 185 } 186 187 /* 188 * Encoder might sample data on different clock edge than the display, 189 * for example OnSemi FIN3385 has a dedicated strapping pin to select 190 * the sampling edge. 191 */ 192 if (lvds_codec->connector_type == DRM_MODE_CONNECTOR_LVDS && 193 !of_property_read_u32(dev->of_node, "pclk-sample", &val)) { 194 lvds_codec->timings.input_bus_flags = val ? 195 DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE : 196 DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; 197 } 198 199 /* 200 * The panel_bridge bridge is attached to the panel's of_node, 201 * but we need a bridge attached to our of_node for our user 202 * to look up. 203 */ 204 lvds_codec->bridge.of_node = dev->of_node; 205 lvds_codec->bridge.timings = &lvds_codec->timings; 206 drm_bridge_add(&lvds_codec->bridge); 207 208 platform_set_drvdata(pdev, lvds_codec); 209 210 return 0; 211} 212 213static void lvds_codec_remove(struct platform_device *pdev) 214{ 215 struct lvds_codec *lvds_codec = platform_get_drvdata(pdev); 216 217 drm_bridge_remove(&lvds_codec->bridge); 218} 219 220static const struct of_device_id lvds_codec_match[] = { 221 { 222 .compatible = "lvds-decoder", 223 .data = (void *)DRM_MODE_CONNECTOR_DPI, 224 }, 225 { 226 .compatible = "lvds-encoder", 227 .data = (void *)DRM_MODE_CONNECTOR_LVDS, 228 }, 229 { 230 .compatible = "thine,thc63lvdm83d", 231 .data = (void *)DRM_MODE_CONNECTOR_LVDS, 232 }, 233 {}, 234}; 235MODULE_DEVICE_TABLE(of, lvds_codec_match); 236 237static struct platform_driver lvds_codec_driver = { 238 .probe = lvds_codec_probe, 239 .remove_new = lvds_codec_remove, 240 .driver = { 241 .name = "lvds-codec", 242 .of_match_table = lvds_codec_match, 243 }, 244}; 245module_platform_driver(lvds_codec_driver); 246 247MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 248MODULE_DESCRIPTION("LVDS encoders and decoders"); 249MODULE_LICENSE("GPL"); 250