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1// SPDX-License-Identifier: GPL-2.0+2/*3 * i.MX drm driver - parallel display implementation4 *5 * Copyright (C) 2012 Sascha Hauer, Pengutronix6 */7 8#include <linux/component.h>9#include <linux/media-bus-format.h>10#include <linux/module.h>11#include <linux/of.h>12#include <linux/platform_device.h>13#include <linux/videodev2.h>14 15#include <video/of_display_timing.h>16 17#include <drm/drm_atomic_helper.h>18#include <drm/drm_bridge.h>19#include <drm/drm_edid.h>20#include <drm/drm_managed.h>21#include <drm/drm_of.h>22#include <drm/drm_panel.h>23#include <drm/drm_probe_helper.h>24#include <drm/drm_simple_kms_helper.h>25 26#include "imx-drm.h"27 28struct imx_parallel_display_encoder {29 struct drm_connector connector;30 struct drm_encoder encoder;31 struct drm_bridge bridge;32 struct imx_parallel_display *pd;33};34 35struct imx_parallel_display {36 struct device *dev;37 const struct drm_edid *drm_edid;38 u32 bus_format;39 u32 bus_flags;40 struct drm_display_mode mode;41 struct drm_panel *panel;42 struct drm_bridge *next_bridge;43};44 45static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)46{47 return container_of(c, struct imx_parallel_display_encoder, connector)->pd;48}49 50static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)51{52 return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;53}54 55static int imx_pd_connector_get_modes(struct drm_connector *connector)56{57 struct imx_parallel_display *imxpd = con_to_imxpd(connector);58 struct device_node *np = imxpd->dev->of_node;59 int num_modes;60 61 num_modes = drm_panel_get_modes(imxpd->panel, connector);62 if (num_modes > 0)63 return num_modes;64 65 if (imxpd->drm_edid) {66 drm_edid_connector_update(connector, imxpd->drm_edid);67 num_modes = drm_edid_connector_add_modes(connector);68 }69 70 if (np) {71 struct drm_display_mode *mode = drm_mode_create(connector->dev);72 int ret;73 74 if (!mode)75 return 0;76 77 ret = of_get_drm_display_mode(np, &imxpd->mode,78 &imxpd->bus_flags,79 OF_USE_NATIVE_MODE);80 if (ret) {81 drm_mode_destroy(connector->dev, mode);82 return 0;83 }84 85 drm_mode_copy(mode, &imxpd->mode);86 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;87 drm_mode_probed_add(connector, mode);88 num_modes++;89 }90 91 return num_modes;92}93 94static void imx_pd_bridge_enable(struct drm_bridge *bridge)95{96 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);97 98 drm_panel_prepare(imxpd->panel);99 drm_panel_enable(imxpd->panel);100}101 102static void imx_pd_bridge_disable(struct drm_bridge *bridge)103{104 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);105 106 drm_panel_disable(imxpd->panel);107 drm_panel_unprepare(imxpd->panel);108}109 110static const u32 imx_pd_bus_fmts[] = {111 MEDIA_BUS_FMT_RGB888_1X24,112 MEDIA_BUS_FMT_BGR888_1X24,113 MEDIA_BUS_FMT_GBR888_1X24,114 MEDIA_BUS_FMT_RGB666_1X18,115 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,116 MEDIA_BUS_FMT_RGB565_1X16,117};118 119static u32 *120imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,121 struct drm_bridge_state *bridge_state,122 struct drm_crtc_state *crtc_state,123 struct drm_connector_state *conn_state,124 unsigned int *num_output_fmts)125{126 struct drm_display_info *di = &conn_state->connector->display_info;127 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);128 u32 *output_fmts;129 130 if (!imxpd->bus_format && !di->num_bus_formats) {131 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);132 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),133 GFP_KERNEL);134 }135 136 *num_output_fmts = 1;137 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);138 if (!output_fmts)139 return NULL;140 141 if (!imxpd->bus_format && di->num_bus_formats)142 output_fmts[0] = di->bus_formats[0];143 else144 output_fmts[0] = imxpd->bus_format;145 146 return output_fmts;147}148 149static bool imx_pd_format_supported(u32 output_fmt)150{151 unsigned int i;152 153 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {154 if (imx_pd_bus_fmts[i] == output_fmt)155 return true;156 }157 158 return false;159}160 161static u32 *162imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,163 struct drm_bridge_state *bridge_state,164 struct drm_crtc_state *crtc_state,165 struct drm_connector_state *conn_state,166 u32 output_fmt,167 unsigned int *num_input_fmts)168{169 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);170 u32 *input_fmts;171 172 /*173 * If the next bridge does not support bus format negotiation, let's174 * use the static bus format definition (imxpd->bus_format) if it's175 * specified, RGB888 when it's not.176 */177 if (output_fmt == MEDIA_BUS_FMT_FIXED)178 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;179 180 /* Now make sure the requested output format is supported. */181 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||182 !imx_pd_format_supported(output_fmt)) {183 *num_input_fmts = 0;184 return NULL;185 }186 187 *num_input_fmts = 1;188 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);189 if (!input_fmts)190 return NULL;191 192 input_fmts[0] = output_fmt;193 return input_fmts;194}195 196static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,197 struct drm_bridge_state *bridge_state,198 struct drm_crtc_state *crtc_state,199 struct drm_connector_state *conn_state)200{201 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);202 struct drm_display_info *di = &conn_state->connector->display_info;203 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);204 struct drm_bridge_state *next_bridge_state = NULL;205 struct drm_bridge *next_bridge;206 u32 bus_flags, bus_fmt;207 208 next_bridge = drm_bridge_get_next_bridge(bridge);209 if (next_bridge)210 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,211 next_bridge);212 213 if (next_bridge_state)214 bus_flags = next_bridge_state->input_bus_cfg.flags;215 else if (di->num_bus_formats)216 bus_flags = di->bus_flags;217 else218 bus_flags = imxpd->bus_flags;219 220 bus_fmt = bridge_state->input_bus_cfg.format;221 if (!imx_pd_format_supported(bus_fmt))222 return -EINVAL;223 224 bridge_state->output_bus_cfg.flags = bus_flags;225 bridge_state->input_bus_cfg.flags = bus_flags;226 imx_crtc_state->bus_flags = bus_flags;227 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;228 imx_crtc_state->di_hsync_pin = 2;229 imx_crtc_state->di_vsync_pin = 3;230 231 return 0;232}233 234static const struct drm_connector_funcs imx_pd_connector_funcs = {235 .fill_modes = drm_helper_probe_single_connector_modes,236 .destroy = imx_drm_connector_destroy,237 .reset = drm_atomic_helper_connector_reset,238 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,239 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,240};241 242static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {243 .get_modes = imx_pd_connector_get_modes,244};245 246static const struct drm_bridge_funcs imx_pd_bridge_funcs = {247 .enable = imx_pd_bridge_enable,248 .disable = imx_pd_bridge_disable,249 .atomic_reset = drm_atomic_helper_bridge_reset,250 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,251 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,252 .atomic_check = imx_pd_bridge_atomic_check,253 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,254 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,255};256 257static int imx_pd_bind(struct device *dev, struct device *master, void *data)258{259 struct drm_device *drm = data;260 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);261 struct imx_parallel_display_encoder *imxpd_encoder;262 struct drm_connector *connector;263 struct drm_encoder *encoder;264 struct drm_bridge *bridge;265 int ret;266 267 imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,268 encoder, DRM_MODE_ENCODER_NONE);269 if (IS_ERR(imxpd_encoder))270 return PTR_ERR(imxpd_encoder);271 272 imxpd_encoder->pd = imxpd;273 connector = &imxpd_encoder->connector;274 encoder = &imxpd_encoder->encoder;275 bridge = &imxpd_encoder->bridge;276 277 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);278 if (ret)279 return ret;280 281 /* set the connector's dpms to OFF so that282 * drm_helper_connector_dpms() won't return283 * immediately since the current state is ON284 * at this point.285 */286 connector->dpms = DRM_MODE_DPMS_OFF;287 288 bridge->funcs = &imx_pd_bridge_funcs;289 drm_bridge_attach(encoder, bridge, NULL, 0);290 291 if (imxpd->next_bridge) {292 ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);293 if (ret < 0)294 return ret;295 } else {296 drm_connector_helper_add(connector,297 &imx_pd_connector_helper_funcs);298 drm_connector_init(drm, connector, &imx_pd_connector_funcs,299 DRM_MODE_CONNECTOR_DPI);300 301 drm_connector_attach_encoder(connector, encoder);302 }303 304 return 0;305}306 307static const struct component_ops imx_pd_ops = {308 .bind = imx_pd_bind,309};310 311static int imx_pd_probe(struct platform_device *pdev)312{313 struct device *dev = &pdev->dev;314 struct device_node *np = dev->of_node;315 const u8 *edidp;316 struct imx_parallel_display *imxpd;317 int edid_len;318 int ret;319 u32 bus_format = 0;320 const char *fmt;321 322 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);323 if (!imxpd)324 return -ENOMEM;325 326 /* port@1 is the output port */327 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,328 &imxpd->next_bridge);329 if (ret && ret != -ENODEV)330 return ret;331 332 edidp = of_get_property(np, "edid", &edid_len);333 if (edidp)334 imxpd->drm_edid = drm_edid_alloc(edidp, edid_len);335 336 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);337 if (!ret) {338 if (!strcmp(fmt, "rgb24"))339 bus_format = MEDIA_BUS_FMT_RGB888_1X24;340 else if (!strcmp(fmt, "rgb565"))341 bus_format = MEDIA_BUS_FMT_RGB565_1X16;342 else if (!strcmp(fmt, "bgr666"))343 bus_format = MEDIA_BUS_FMT_RGB666_1X18;344 else if (!strcmp(fmt, "lvds666"))345 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;346 }347 imxpd->bus_format = bus_format;348 349 imxpd->dev = dev;350 351 platform_set_drvdata(pdev, imxpd);352 353 return component_add(dev, &imx_pd_ops);354}355 356static void imx_pd_remove(struct platform_device *pdev)357{358 struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);359 360 component_del(&pdev->dev, &imx_pd_ops);361 362 drm_edid_free(imxpd->drm_edid);363}364 365static const struct of_device_id imx_pd_dt_ids[] = {366 { .compatible = "fsl,imx-parallel-display", },367 { /* sentinel */ }368};369MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);370 371static struct platform_driver imx_pd_driver = {372 .probe = imx_pd_probe,373 .remove_new = imx_pd_remove,374 .driver = {375 .of_match_table = imx_pd_dt_ids,376 .name = "imx-parallel-display",377 },378};379 380module_platform_driver(imx_pd_driver);381 382MODULE_DESCRIPTION("i.MX parallel display driver");383MODULE_AUTHOR("Sascha Hauer, Pengutronix");384MODULE_LICENSE("GPL");385MODULE_ALIAS("platform:imx-parallel-display");386