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 int tegra_output_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 struct drm_encoder *
  61 tegra_output_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_output_connector_get_modes,
  70         .mode_valid = tegra_connector_mode_valid,
  71         .best_encoder = tegra_output_connector_best_encoder,
  72 };
  73
  74 enum drm_connector_status
  75 tegra_output_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 void tegra_output_connector_destroy(struct drm_connector *connector)
 102 {
 103         drm_connector_unregister(connector);
 104         drm_connector_cleanup(connector);
 105 }
 106
 107 static const struct drm_connector_funcs connector_funcs = {
 108         .dpms = drm_helper_connector_dpms,
 109         .detect = tegra_output_connector_detect,
 110         .fill_modes = drm_helper_probe_single_connector_modes,
 111         .destroy = tegra_output_connector_destroy,
 112 };
 113
 114 void tegra_output_encoder_destroy(struct drm_encoder *encoder)
 115 {
 116         drm_encoder_cleanup(encoder);
 117 }
 118
 119 static const struct drm_encoder_funcs encoder_funcs = {
 120         .destroy = tegra_output_encoder_destroy,
 121 };
 122
 123 static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
 124 {
 125         struct tegra_output *output = encoder_to_output(encoder);
 126         struct drm_panel *panel = output->panel;
 127
 128         if (mode != DRM_MODE_DPMS_ON) {
 129                 drm_panel_disable(panel);
 130                 tegra_output_disable(output);
 131                 drm_panel_unprepare(panel);
 132         } else {
 133                 drm_panel_prepare(panel);
 134                 tegra_output_enable(output);
 135                 drm_panel_enable(panel);
 136         }
 137 }
 138
 139 static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
 140                                      const struct drm_display_mode *mode,
 141                                      struct drm_display_mode *adjusted)
 142 {
 143         return true;
 144 }
 145
 146 static void tegra_encoder_prepare(struct drm_encoder *encoder)
 147 {
 148         tegra_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 149 }
 150
 151 static void tegra_encoder_commit(struct drm_encoder *encoder)
 152 {
 153         tegra_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 154 }
 155
 156 static void tegra_encoder_mode_set(struct drm_encoder *encoder,
 157                                    struct drm_display_mode *mode,
 158                                    struct drm_display_mode *adjusted)
 159 {
 160 }
 161
 162 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 163         .dpms = tegra_encoder_dpms,
 164         .mode_fixup = tegra_encoder_mode_fixup,
 165         .prepare = tegra_encoder_prepare,
 166         .commit = tegra_encoder_commit,
 167         .mode_set = tegra_encoder_mode_set,
 168 };
 169
 170 static irqreturn_t hpd_irq(int irq, void *data)
 171 {
 172         struct tegra_output *output = data;
 173
 174         if (output->connector.dev)
 175                 drm_helper_hpd_irq_event(output->connector.dev);
 176
 177         return IRQ_HANDLED;
 178 }
 179
 180 int tegra_output_probe(struct tegra_output *output)
 181 {
 182         struct device_node *ddc, *panel;
 183         enum of_gpio_flags flags;
 184         int err, size;
 185
 186         if (!output->of_node)
 187                 output->of_node = output->dev->of_node;
 188
 189         panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
 190         if (panel) {
 191                 output->panel = of_drm_find_panel(panel);
 192                 if (!output->panel)
 193                         return -EPROBE_DEFER;
 194
 195                 of_node_put(panel);
 196         }
 197
 198         output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
 199
 200         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 201         if (ddc) {
 202                 output->ddc = of_find_i2c_adapter_by_node(ddc);
 203                 if (!output->ddc) {
 204                         err = -EPROBE_DEFER;
 205                         of_node_put(ddc);
 206                         return err;
 207                 }
 208
 209                 of_node_put(ddc);
 210         }
 211
 212         output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
 213                                                    "nvidia,hpd-gpio", 0,
 214                                                    &flags);
 215         if (gpio_is_valid(output->hpd_gpio)) {
 216                 unsigned long flags;
 217
 218                 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
 219                                        "HDMI hotplug detect");
 220                 if (err < 0) {
 221                         dev_err(output->dev, "gpio_request_one(): %d\n", err);
 222                         return err;
 223                 }
 224
 225                 err = gpio_to_irq(output->hpd_gpio);
 226                 if (err < 0) {
 227                         dev_err(output->dev, "gpio_to_irq(): %d\n", err);
 228                         gpio_free(output->hpd_gpio);
 229                         return err;
 230                 }
 231
 232                 output->hpd_irq = err;
 233
 234                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 235                         IRQF_ONESHOT;
 236
 237                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 238                                            flags, "hpd", output);
 239                 if (err < 0) {
 240                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 241                                 output->hpd_irq, err);
 242                         gpio_free(output->hpd_gpio);
 243                         return err;
 244                 }
 245
 246                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 247
 248                 /*
 249                  * Disable the interrupt until the connector has been
 250                  * initialized to avoid a race in the hotplug interrupt
 251                  * handler.
 252                  */
 253                 disable_irq(output->hpd_irq);
 254         }
 255
 256         return 0;
 257 }
 258
 259 int tegra_output_remove(struct tegra_output *output)
 260 {
 261         if (gpio_is_valid(output->hpd_gpio)) {
 262                 free_irq(output->hpd_irq, output);
 263                 gpio_free(output->hpd_gpio);
 264         }
 265
 266         if (output->ddc)
 267                 put_device(&output->ddc->dev);
 268
 269         return 0;
 270 }
 271
 272 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 273 {
 274         int connector, encoder;
 275
 276         switch (output->type) {
 277         case TEGRA_OUTPUT_EDP:
 278                 connector = DRM_MODE_CONNECTOR_eDP;
 279                 encoder = DRM_MODE_ENCODER_TMDS;
 280                 break;
 281
 282         default:
 283                 connector = DRM_MODE_CONNECTOR_Unknown;
 284                 encoder = DRM_MODE_ENCODER_NONE;
 285                 break;
 286         }
 287
 288         drm_connector_init(drm, &output->connector, &connector_funcs,
 289                            connector);
 290         drm_connector_helper_add(&output->connector, &connector_helper_funcs);
 291         output->connector.dpms = DRM_MODE_DPMS_OFF;
 292
 293         if (output->panel)
 294                 drm_panel_attach(output->panel, &output->connector);
 295
 296         drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
 297         drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
 298
 299         drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
 300         drm_connector_register(&output->connector);
 301
 302         output->encoder.possible_crtcs = 0x3;
 303
 304         /*
 305          * The connector is now registered and ready to receive hotplug events
 306          * so the hotplug interrupt can be enabled.
 307          */
 308         if (gpio_is_valid(output->hpd_gpio))
 309                 enable_irq(output->hpd_irq);
 310
 311         return 0;
 312 }
 313
 314 int tegra_output_exit(struct tegra_output *output)
 315 {
 316         /*
 317          * The connector is going away, so the interrupt must be disabled to
 318          * prevent the hotplug interrupt handler from potentially crashing.
 319          */
 320         if (gpio_is_valid(output->hpd_gpio))
 321                 disable_irq(output->hpd_irq);
 322
 323         if (output->panel)
 324                 drm_panel_detach(output->panel);
 325
 326         return 0;
 327 }