drivers/gpu/drm/tegra/output.c

   1 /*
   2  * Copyright (C) 2012 Avionic Design GmbH
   3  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/of_gpio.h>
  11
  12 #include <drm/drm_panel.h>
  13 #include "drm.h"
  14
  15 static int tegra_connector_get_modes(struct drm_connector *connector)
  16 {
  17         struct tegra_output *output = connector_to_output(connector);
  18         struct edid *edid = NULL;
  19         int err = 0;
  20
  21         /*
  22          * If the panel provides one or more modes, use them exclusively and
  23          * ignore any other means of obtaining a mode.
  24          */
  25         if (output->panel) {
  26                 err = output->panel->funcs->get_modes(output->panel);
  27                 if (err > 0)
  28                         return err;
  29         }
  30
  31         if (output->edid)
  32                 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
  33         else if (output->ddc)
  34                 edid = drm_get_edid(connector, output->ddc);
  35
  36         drm_mode_connector_update_edid_property(connector, edid);
  37
  38         if (edid) {
  39                 err = drm_add_edid_modes(connector, edid);
  40                 kfree(edid);
  41         }
  42
  43         return err;
  44 }
  45
  46 static int tegra_connector_mode_valid(struct drm_connector *connector,
  47                                       struct drm_display_mode *mode)
  48 {
  49         struct tegra_output *output = connector_to_output(connector);
  50         enum drm_mode_status status = MODE_OK;
  51         int err;
  52
  53         err = tegra_output_check_mode(output, mode, &status);
  54         if (err < 0)
  55                 return MODE_ERROR;
  56
  57         return status;
  58 }
  59
  60 static struct drm_encoder *
  61 tegra_connector_best_encoder(struct drm_connector *connector)
  62 {
  63         struct tegra_output *output = connector_to_output(connector);
  64
  65         return &output->encoder;
  66 }
  67
  68 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  69         .get_modes = tegra_connector_get_modes,
  70         .mode_valid = tegra_connector_mode_valid,
  71         .best_encoder = tegra_connector_best_encoder,
  72 };
  73
  74 static enum drm_connector_status
  75 tegra_connector_detect(struct drm_connector *connector, bool force)
  76 {
  77         struct tegra_output *output = connector_to_output(connector);
  78         enum drm_connector_status status = connector_status_unknown;
  79
  80         if (output->ops->detect)
  81                 return output->ops->detect(output);
  82
  83         if (gpio_is_valid(output->hpd_gpio)) {
  84                 if (gpio_get_value(output->hpd_gpio) == 0)
  85                         status = connector_status_disconnected;
  86                 else
  87                         status = connector_status_connected;
  88         } else {
  89                 if (!output->panel)
  90                         status = connector_status_disconnected;
  91                 else
  92                         status = connector_status_connected;
  93
  94                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
  95                         status = connector_status_connected;
  96         }
  97
  98         return status;
  99 }
 100
 101 static void drm_connector_clear(struct drm_connector *connector)
 102 {
 103         memset(connector, 0, sizeof(*connector));
 104 }
 105
 106 static void tegra_connector_destroy(struct drm_connector *connector)
 107 {
 108         drm_connector_unregister(connector);
 109         drm_connector_cleanup(connector);
 110         drm_connector_clear(connector);
 111 }
 112
 113 static const struct drm_connector_funcs connector_funcs = {
 114         .dpms = drm_helper_connector_dpms,
 115         .detect = tegra_connector_detect,
 116         .fill_modes = drm_helper_probe_single_connector_modes,
 117         .destroy = tegra_connector_destroy,
 118 };
 119
 120 static void drm_encoder_clear(struct drm_encoder *encoder)
 121 {
 122         memset(encoder, 0, sizeof(*encoder));
 123 }
 124
 125 static void tegra_encoder_destroy(struct drm_encoder *encoder)
 126 {
 127         drm_encoder_cleanup(encoder);
 128         drm_encoder_clear(encoder);
 129 }
 130
 131 static const struct drm_encoder_funcs encoder_funcs = {
 132         .destroy = tegra_encoder_destroy,
 133 };
 134
 135 static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
 136 {
 137         struct tegra_output *output = encoder_to_output(encoder);
 138         struct drm_panel *panel = output->panel;
 139
 140         if (mode != DRM_MODE_DPMS_ON) {
 141                 drm_panel_disable(panel);
 142                 tegra_output_disable(output);
 143                 drm_panel_unprepare(panel);
 144         } else {
 145                 drm_panel_prepare(panel);
 146                 tegra_output_enable(output);
 147                 drm_panel_enable(panel);
 148         }
 149 }
 150
 151 static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
 152                                      const struct drm_display_mode *mode,
 153                                      struct drm_display_mode *adjusted)
 154 {
 155         return true;
 156 }
 157
 158 static void tegra_encoder_prepare(struct drm_encoder *encoder)
 159 {
 160 }
 161
 162 static void tegra_encoder_commit(struct drm_encoder *encoder)
 163 {
 164 }
 165
 166 static void tegra_encoder_mode_set(struct drm_encoder *encoder,
 167                                    struct drm_display_mode *mode,
 168                                    struct drm_display_mode *adjusted)
 169 {
 170         struct tegra_output *output = encoder_to_output(encoder);
 171         int err;
 172
 173         err = tegra_output_enable(output);
 174         if (err < 0)
 175                 dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
 176 }
 177
 178 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 179         .dpms = tegra_encoder_dpms,
 180         .mode_fixup = tegra_encoder_mode_fixup,
 181         .prepare = tegra_encoder_prepare,
 182         .commit = tegra_encoder_commit,
 183         .mode_set = tegra_encoder_mode_set,
 184 };
 185
 186 static irqreturn_t hpd_irq(int irq, void *data)
 187 {
 188         struct tegra_output *output = data;
 189
 190         drm_helper_hpd_irq_event(output->connector.dev);
 191
 192         return IRQ_HANDLED;
 193 }
 194
 195 int tegra_output_probe(struct tegra_output *output)
 196 {
 197         struct device_node *ddc, *panel;
 198         enum of_gpio_flags flags;
 199         int err, size;
 200
 201         if (!output->of_node)
 202                 output->of_node = output->dev->of_node;
 203
 204         panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
 205         if (panel) {
 206                 output->panel = of_drm_find_panel(panel);
 207                 if (!output->panel)
 208                         return -EPROBE_DEFER;
 209
 210                 of_node_put(panel);
 211         }
 212
 213         output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
 214
 215         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 216         if (ddc) {
 217                 output->ddc = of_find_i2c_adapter_by_node(ddc);
 218                 if (!output->ddc) {
 219                         err = -EPROBE_DEFER;
 220                         of_node_put(ddc);
 221                         return err;
 222                 }
 223
 224                 of_node_put(ddc);
 225         }
 226
 227         output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
 228                                                    "nvidia,hpd-gpio", 0,
 229                                                    &flags);
 230         if (gpio_is_valid(output->hpd_gpio)) {
 231                 unsigned long flags;
 232
 233                 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
 234                                        "HDMI hotplug detect");
 235                 if (err < 0) {
 236                         dev_err(output->dev, "gpio_request_one(): %d\n", err);
 237                         return err;
 238                 }
 239
 240                 err = gpio_to_irq(output->hpd_gpio);
 241                 if (err < 0) {
 242                         dev_err(output->dev, "gpio_to_irq(): %d\n", err);
 243                         gpio_free(output->hpd_gpio);
 244                         return err;
 245                 }
 246
 247                 output->hpd_irq = err;
 248
 249                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 250                         IRQF_ONESHOT;
 251
 252                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 253                                            flags, "hpd", output);
 254                 if (err < 0) {
 255                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 256                                 output->hpd_irq, err);
 257                         gpio_free(output->hpd_gpio);
 258                         return err;
 259                 }
 260
 261                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 262         }
 263
 264         return 0;
 265 }
 266
 267 int tegra_output_remove(struct tegra_output *output)
 268 {
 269         if (gpio_is_valid(output->hpd_gpio)) {
 270                 free_irq(output->hpd_irq, output);
 271                 gpio_free(output->hpd_gpio);
 272         }
 273
 274         if (output->ddc)
 275                 put_device(&output->ddc->dev);
 276
 277         return 0;
 278 }
 279
 280 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 281 {
 282         int connector, encoder;
 283
 284         switch (output->type) {
 285         case TEGRA_OUTPUT_RGB:
 286                 connector = DRM_MODE_CONNECTOR_LVDS;
 287                 encoder = DRM_MODE_ENCODER_LVDS;
 288                 break;
 289
 290         case TEGRA_OUTPUT_HDMI:
 291                 connector = DRM_MODE_CONNECTOR_HDMIA;
 292                 encoder = DRM_MODE_ENCODER_TMDS;
 293                 break;
 294
 295         case TEGRA_OUTPUT_DSI:
 296                 connector = DRM_MODE_CONNECTOR_DSI;
 297                 encoder = DRM_MODE_ENCODER_DSI;
 298                 break;
 299
 300         case TEGRA_OUTPUT_EDP:
 301                 connector = DRM_MODE_CONNECTOR_eDP;
 302                 encoder = DRM_MODE_ENCODER_TMDS;
 303                 break;
 304
 305         default:
 306                 connector = DRM_MODE_CONNECTOR_Unknown;
 307                 encoder = DRM_MODE_ENCODER_NONE;
 308                 break;
 309         }
 310
 311         drm_connector_init(drm, &output->connector, &connector_funcs,
 312                            connector);
 313         drm_connector_helper_add(&output->connector, &connector_helper_funcs);
 314         output->connector.dpms = DRM_MODE_DPMS_OFF;
 315
 316         if (output->panel)
 317                 drm_panel_attach(output->panel, &output->connector);
 318
 319         drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
 320         drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
 321
 322         drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
 323         drm_connector_register(&output->connector);
 324
 325         output->encoder.possible_crtcs = 0x3;
 326
 327         return 0;
 328 }
 329
 330 int tegra_output_exit(struct tegra_output *output)
 331 {
 332         return 0;
 333 }