linux/drivers/gpu/drm/tilcdc/tilcdc_panel.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2012 Texas Instruments
   4 * Author: Rob Clark <robdclark@gmail.com>
   5 */
   6
   7#include <linux/gpio/consumer.h>
   8#include <linux/pinctrl/consumer.h>
   9#include <linux/platform_device.h>
  10
  11#include <video/display_timing.h>
  12#include <video/of_display_timing.h>
  13#include <video/videomode.h>
  14
  15#include <drm/drm_atomic_state_helper.h>
  16#include <drm/drm_connector.h>
  17#include <drm/drm_modeset_helper_vtables.h>
  18#include <drm/drm_probe_helper.h>
  19
  20#include "tilcdc_drv.h"
  21#include "tilcdc_panel.h"
  22
  23struct panel_module {
  24        struct tilcdc_module base;
  25        struct tilcdc_panel_info *info;
  26        struct display_timings *timings;
  27        struct backlight_device *backlight;
  28        struct gpio_desc *enable_gpio;
  29};
  30#define to_panel_module(x) container_of(x, struct panel_module, base)
  31
  32
  33/*
  34 * Encoder:
  35 */
  36
  37struct panel_encoder {
  38        struct drm_encoder base;
  39        struct panel_module *mod;
  40};
  41#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  42
  43static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  44{
  45        struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  46        struct backlight_device *backlight = panel_encoder->mod->backlight;
  47        struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  48
  49        if (backlight) {
  50                backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  51                                         FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  52                backlight_update_status(backlight);
  53        }
  54
  55        if (gpio)
  56                gpiod_set_value_cansleep(gpio,
  57                                         mode == DRM_MODE_DPMS_ON ? 1 : 0);
  58}
  59
  60static void panel_encoder_prepare(struct drm_encoder *encoder)
  61{
  62        panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  63}
  64
  65static void panel_encoder_commit(struct drm_encoder *encoder)
  66{
  67        panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  68}
  69
  70static void panel_encoder_mode_set(struct drm_encoder *encoder,
  71                struct drm_display_mode *mode,
  72                struct drm_display_mode *adjusted_mode)
  73{
  74        /* nothing needed */
  75}
  76
  77static const struct drm_encoder_funcs panel_encoder_funcs = {
  78                .destroy        = drm_encoder_cleanup,
  79};
  80
  81static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  82                .dpms           = panel_encoder_dpms,
  83                .prepare        = panel_encoder_prepare,
  84                .commit         = panel_encoder_commit,
  85                .mode_set       = panel_encoder_mode_set,
  86};
  87
  88static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
  89                struct panel_module *mod)
  90{
  91        struct panel_encoder *panel_encoder;
  92        struct drm_encoder *encoder;
  93        int ret;
  94
  95        panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
  96                                     GFP_KERNEL);
  97        if (!panel_encoder)
  98                return NULL;
  99
 100        panel_encoder->mod = mod;
 101
 102        encoder = &panel_encoder->base;
 103        encoder->possible_crtcs = 1;
 104
 105        ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 106                        DRM_MODE_ENCODER_LVDS, NULL);
 107        if (ret < 0)
 108                goto fail;
 109
 110        drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 111
 112        return encoder;
 113
 114fail:
 115        drm_encoder_cleanup(encoder);
 116        return NULL;
 117}
 118
 119/*
 120 * Connector:
 121 */
 122
 123struct panel_connector {
 124        struct drm_connector base;
 125
 126        struct drm_encoder *encoder;  /* our connected encoder */
 127        struct panel_module *mod;
 128};
 129#define to_panel_connector(x) container_of(x, struct panel_connector, base)
 130
 131
 132static void panel_connector_destroy(struct drm_connector *connector)
 133{
 134        drm_connector_unregister(connector);
 135        drm_connector_cleanup(connector);
 136}
 137
 138static int panel_connector_get_modes(struct drm_connector *connector)
 139{
 140        struct drm_device *dev = connector->dev;
 141        struct panel_connector *panel_connector = to_panel_connector(connector);
 142        struct display_timings *timings = panel_connector->mod->timings;
 143        int i;
 144
 145        for (i = 0; i < timings->num_timings; i++) {
 146                struct drm_display_mode *mode = drm_mode_create(dev);
 147                struct videomode vm;
 148
 149                if (videomode_from_timings(timings, &vm, i))
 150                        break;
 151
 152                drm_display_mode_from_videomode(&vm, mode);
 153
 154                mode->type = DRM_MODE_TYPE_DRIVER;
 155
 156                if (timings->native_mode == i)
 157                        mode->type |= DRM_MODE_TYPE_PREFERRED;
 158
 159                drm_mode_set_name(mode);
 160                drm_mode_probed_add(connector, mode);
 161        }
 162
 163        return i;
 164}
 165
 166static struct drm_encoder *panel_connector_best_encoder(
 167                struct drm_connector *connector)
 168{
 169        struct panel_connector *panel_connector = to_panel_connector(connector);
 170        return panel_connector->encoder;
 171}
 172
 173static const struct drm_connector_funcs panel_connector_funcs = {
 174        .destroy            = panel_connector_destroy,
 175        .fill_modes         = drm_helper_probe_single_connector_modes,
 176        .reset              = drm_atomic_helper_connector_reset,
 177        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 178        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 179};
 180
 181static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 182        .get_modes          = panel_connector_get_modes,
 183        .best_encoder       = panel_connector_best_encoder,
 184};
 185
 186static struct drm_connector *panel_connector_create(struct drm_device *dev,
 187                struct panel_module *mod, struct drm_encoder *encoder)
 188{
 189        struct panel_connector *panel_connector;
 190        struct drm_connector *connector;
 191        int ret;
 192
 193        panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 194                                       GFP_KERNEL);
 195        if (!panel_connector)
 196                return NULL;
 197
 198        panel_connector->encoder = encoder;
 199        panel_connector->mod = mod;
 200
 201        connector = &panel_connector->base;
 202
 203        drm_connector_init(dev, connector, &panel_connector_funcs,
 204                        DRM_MODE_CONNECTOR_LVDS);
 205        drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 206
 207        connector->interlace_allowed = 0;
 208        connector->doublescan_allowed = 0;
 209
 210        ret = drm_connector_attach_encoder(connector, encoder);
 211        if (ret)
 212                goto fail;
 213
 214        return connector;
 215
 216fail:
 217        panel_connector_destroy(connector);
 218        return NULL;
 219}
 220
 221/*
 222 * Module:
 223 */
 224
 225static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 226{
 227        struct panel_module *panel_mod = to_panel_module(mod);
 228        struct tilcdc_drm_private *priv = dev->dev_private;
 229        struct drm_encoder *encoder;
 230        struct drm_connector *connector;
 231
 232        encoder = panel_encoder_create(dev, panel_mod);
 233        if (!encoder)
 234                return -ENOMEM;
 235
 236        connector = panel_connector_create(dev, panel_mod, encoder);
 237        if (!connector)
 238                return -ENOMEM;
 239
 240        priv->encoders[priv->num_encoders++] = encoder;
 241        priv->connectors[priv->num_connectors++] = connector;
 242
 243        tilcdc_crtc_set_panel_info(priv->crtc,
 244                                   to_panel_encoder(encoder)->mod->info);
 245
 246        return 0;
 247}
 248
 249static const struct tilcdc_module_ops panel_module_ops = {
 250                .modeset_init = panel_modeset_init,
 251};
 252
 253/*
 254 * Device:
 255 */
 256
 257/* maybe move this somewhere common if it is needed by other outputs? */
 258static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 259{
 260        struct device_node *info_np;
 261        struct tilcdc_panel_info *info;
 262        int ret = 0;
 263
 264        if (!np) {
 265                pr_err("%s: no devicenode given\n", __func__);
 266                return NULL;
 267        }
 268
 269        info_np = of_get_child_by_name(np, "panel-info");
 270        if (!info_np) {
 271                pr_err("%s: could not find panel-info node\n", __func__);
 272                return NULL;
 273        }
 274
 275        info = kzalloc(sizeof(*info), GFP_KERNEL);
 276        if (!info)
 277                goto put_node;
 278
 279        ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 280        ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 281        ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 282        ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 283        ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 284        ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 285        ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 286        ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 287        ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 288
 289        /* optional: */
 290        info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 291        info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 292
 293        if (ret) {
 294                pr_err("%s: error reading panel-info properties\n", __func__);
 295                kfree(info);
 296                info = NULL;
 297        }
 298
 299put_node:
 300        of_node_put(info_np);
 301        return info;
 302}
 303
 304static int panel_probe(struct platform_device *pdev)
 305{
 306        struct device_node *bl_node, *node = pdev->dev.of_node;
 307        struct panel_module *panel_mod;
 308        struct tilcdc_module *mod;
 309        struct pinctrl *pinctrl;
 310        int ret;
 311
 312        /* bail out early if no DT data: */
 313        if (!node) {
 314                dev_err(&pdev->dev, "device-tree data is missing\n");
 315                return -ENXIO;
 316        }
 317
 318        panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 319        if (!panel_mod)
 320                return -ENOMEM;
 321
 322        bl_node = of_parse_phandle(node, "backlight", 0);
 323        if (bl_node) {
 324                panel_mod->backlight = of_find_backlight_by_node(bl_node);
 325                of_node_put(bl_node);
 326
 327                if (!panel_mod->backlight)
 328                        return -EPROBE_DEFER;
 329
 330                dev_info(&pdev->dev, "found backlight\n");
 331        }
 332
 333        panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 334                                                         GPIOD_OUT_LOW);
 335        if (IS_ERR(panel_mod->enable_gpio)) {
 336                ret = PTR_ERR(panel_mod->enable_gpio);
 337                dev_err(&pdev->dev, "failed to request enable GPIO\n");
 338                goto fail_backlight;
 339        }
 340
 341        if (panel_mod->enable_gpio)
 342                dev_info(&pdev->dev, "found enable GPIO\n");
 343
 344        mod = &panel_mod->base;
 345        pdev->dev.platform_data = mod;
 346
 347        tilcdc_module_init(mod, "panel", &panel_module_ops);
 348
 349        pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 350        if (IS_ERR(pinctrl))
 351                dev_warn(&pdev->dev, "pins are not configured\n");
 352
 353        panel_mod->timings = of_get_display_timings(node);
 354        if (!panel_mod->timings) {
 355                dev_err(&pdev->dev, "could not get panel timings\n");
 356                ret = -EINVAL;
 357                goto fail_free;
 358        }
 359
 360        panel_mod->info = of_get_panel_info(node);
 361        if (!panel_mod->info) {
 362                dev_err(&pdev->dev, "could not get panel info\n");
 363                ret = -EINVAL;
 364                goto fail_timings;
 365        }
 366
 367        return 0;
 368
 369fail_timings:
 370        display_timings_release(panel_mod->timings);
 371
 372fail_free:
 373        tilcdc_module_cleanup(mod);
 374
 375fail_backlight:
 376        if (panel_mod->backlight)
 377                put_device(&panel_mod->backlight->dev);
 378        return ret;
 379}
 380
 381static int panel_remove(struct platform_device *pdev)
 382{
 383        struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 384        struct panel_module *panel_mod = to_panel_module(mod);
 385        struct backlight_device *backlight = panel_mod->backlight;
 386
 387        if (backlight)
 388                put_device(&backlight->dev);
 389
 390        display_timings_release(panel_mod->timings);
 391
 392        tilcdc_module_cleanup(mod);
 393        kfree(panel_mod->info);
 394
 395        return 0;
 396}
 397
 398static const struct of_device_id panel_of_match[] = {
 399                { .compatible = "ti,tilcdc,panel", },
 400                { },
 401};
 402
 403struct platform_driver panel_driver = {
 404        .probe = panel_probe,
 405        .remove = panel_remove,
 406        .driver = {
 407                .owner = THIS_MODULE,
 408                .name = "tilcdc-panel",
 409                .of_match_table = panel_of_match,
 410        },
 411};
 412
 413int __init tilcdc_panel_init(void)
 414{
 415        return platform_driver_register(&panel_driver);
 416}
 417
 418void __exit tilcdc_panel_fini(void)
 419{
 420        platform_driver_unregister(&panel_driver);
 421}
 422