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 (gpio_is_valid(output->hpd_gpio)) {
  81                 if (gpio_get_value(output->hpd_gpio) == 0)
  82                         status = connector_status_disconnected;
  83                 else
  84                         status = connector_status_connected;
  85         } else {
  86                 if (!output->panel)
  87                         status = connector_status_disconnected;
  88                 else
  89                         status = connector_status_connected;
  90
  91                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
  92                         status = connector_status_connected;
  93         }
  94
  95         return status;
  96 }
  97
  98 static void drm_connector_clear(struct drm_connector *connector)
  99 {
 100         memset(connector, 0, sizeof(*connector));
 101 }
 102
 103 static void tegra_connector_destroy(struct drm_connector *connector)
 104 {
 105         drm_sysfs_connector_remove(connector);
 106         drm_connector_cleanup(connector);
 107         drm_connector_clear(connector);
 108 }
 109
 110 static const struct drm_connector_funcs connector_funcs = {
 111         .dpms = drm_helper_connector_dpms,
 112         .detect = tegra_connector_detect,
 113         .fill_modes = drm_helper_probe_single_connector_modes,
 114         .destroy = tegra_connector_destroy,
 115 };
 116
 117 static void drm_encoder_clear(struct drm_encoder *encoder)
 118 {
 119         memset(encoder, 0, sizeof(*encoder));
 120 }
 121
 122 static void tegra_encoder_destroy(struct drm_encoder *encoder)
 123 {
 124         drm_encoder_cleanup(encoder);
 125         drm_encoder_clear(encoder);
 126 }
 127
 128 static const struct drm_encoder_funcs encoder_funcs = {
 129         .destroy = tegra_encoder_destroy,
 130 };
 131
 132 static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
 133 {
 134         struct tegra_output *output = encoder_to_output(encoder);
 135         struct drm_panel *panel = output->panel;
 136
 137         if (mode != DRM_MODE_DPMS_ON) {
 138                 drm_panel_disable(panel);
 139                 tegra_output_disable(output);
 140         } else {
 141                 tegra_output_enable(output);
 142                 drm_panel_enable(panel);
 143         }
 144 }
 145
 146 static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
 147                                      const struct drm_display_mode *mode,
 148                                      struct drm_display_mode *adjusted)
 149 {
 150         return true;
 151 }
 152
 153 static void tegra_encoder_prepare(struct drm_encoder *encoder)
 154 {
 155 }
 156
 157 static void tegra_encoder_commit(struct drm_encoder *encoder)
 158 {
 159 }
 160
 161 static void tegra_encoder_mode_set(struct drm_encoder *encoder,
 162                                    struct drm_display_mode *mode,
 163                                    struct drm_display_mode *adjusted)
 164 {
 165         struct tegra_output *output = encoder_to_output(encoder);
 166         int err;
 167
 168         err = tegra_output_enable(output);
 169         if (err < 0)
 170                 dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
 171 }
 172
 173 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 174         .dpms = tegra_encoder_dpms,
 175         .mode_fixup = tegra_encoder_mode_fixup,
 176         .prepare = tegra_encoder_prepare,
 177         .commit = tegra_encoder_commit,
 178         .mode_set = tegra_encoder_mode_set,
 179 };
 180
 181 static irqreturn_t hpd_irq(int irq, void *data)
 182 {
 183         struct tegra_output *output = data;
 184
 185         drm_helper_hpd_irq_event(output->connector.dev);
 186
 187         return IRQ_HANDLED;
 188 }
 189
 190 int tegra_output_probe(struct tegra_output *output)
 191 {
 192         struct device_node *ddc, *panel;
 193         enum of_gpio_flags flags;
 194         int err, size;
 195
 196         if (!output->of_node)
 197                 output->of_node = output->dev->of_node;
 198
 199         panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
 200         if (panel) {
 201                 output->panel = of_drm_find_panel(panel);
 202                 if (!output->panel)
 203                         return -EPROBE_DEFER;
 204
 205                 of_node_put(panel);
 206         }
 207
 208         output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
 209
 210         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 211         if (ddc) {
 212                 output->ddc = of_find_i2c_adapter_by_node(ddc);
 213                 if (!output->ddc) {
 214                         err = -EPROBE_DEFER;
 215                         of_node_put(ddc);
 216                         return err;
 217                 }
 218
 219                 of_node_put(ddc);
 220         }
 221
 222         output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
 223                                                    "nvidia,hpd-gpio", 0,
 224                                                    &flags);
 225         if (gpio_is_valid(output->hpd_gpio)) {
 226                 unsigned long flags;
 227
 228                 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
 229                                        "HDMI hotplug detect");
 230                 if (err < 0) {
 231                         dev_err(output->dev, "gpio_request_one(): %d\n", err);
 232                         return err;
 233                 }
 234
 235                 err = gpio_to_irq(output->hpd_gpio);
 236                 if (err < 0) {
 237                         dev_err(output->dev, "gpio_to_irq(): %d\n", err);
 238                         gpio_free(output->hpd_gpio);
 239                         return err;
 240                 }
 241
 242                 output->hpd_irq = err;
 243
 244                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 245                         IRQF_ONESHOT;
 246
 247                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 248                                            flags, "hpd", output);
 249                 if (err < 0) {
 250                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 251                                 output->hpd_irq, err);
 252                         gpio_free(output->hpd_gpio);
 253                         return err;
 254                 }
 255
 256                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 257         }
 258
 259         return 0;
 260 }
 261
 262 int tegra_output_remove(struct tegra_output *output)
 263 {
 264         if (gpio_is_valid(output->hpd_gpio)) {
 265                 free_irq(output->hpd_irq, output);
 266                 gpio_free(output->hpd_gpio);
 267         }
 268
 269         if (output->ddc)
 270                 put_device(&output->ddc->dev);
 271
 272         return 0;
 273 }
 274
 275 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 276 {
 277         int connector, encoder;
 278
 279         switch (output->type) {
 280         case TEGRA_OUTPUT_RGB:
 281                 connector = DRM_MODE_CONNECTOR_LVDS;
 282                 encoder = DRM_MODE_ENCODER_LVDS;
 283                 break;
 284
 285         case TEGRA_OUTPUT_HDMI:
 286                 connector = DRM_MODE_CONNECTOR_HDMIA;
 287                 encoder = DRM_MODE_ENCODER_TMDS;
 288                 break;
 289
 290         case TEGRA_OUTPUT_DSI:
 291                 connector = DRM_MODE_CONNECTOR_DSI;
 292                 encoder = DRM_MODE_ENCODER_DSI;
 293                 break;
 294
 295         default:
 296                 connector = DRM_MODE_CONNECTOR_Unknown;
 297                 encoder = DRM_MODE_ENCODER_NONE;
 298                 break;
 299         }
 300
 301         drm_connector_init(drm, &output->connector, &connector_funcs,
 302                            connector);
 303         drm_connector_helper_add(&output->connector, &connector_helper_funcs);
 304         output->connector.dpms = DRM_MODE_DPMS_OFF;
 305
 306         if (output->panel)
 307                 drm_panel_attach(output->panel, &output->connector);
 308
 309         drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
 310         drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
 311
 312         drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
 313         drm_sysfs_connector_add(&output->connector);
 314
 315         output->encoder.possible_crtcs = 0x3;
 316
 317         return 0;
 318 }
 319
 320 int tegra_output_exit(struct tegra_output *output)
 321 {
 322         return 0;
 323 }