drivers/gpu/host1x/drm/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.h"
  13
  14 static int tegra_connector_get_modes(struct drm_connector *connector)
  15 {
  16         struct tegra_output *output = connector_to_output(connector);
  17         struct edid *edid = NULL;
  18         int err = 0;
  19
  20         if (output->edid)
  21                 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
  22         else if (output->ddc)
  23                 edid = drm_get_edid(connector, output->ddc);
  24
  25         drm_mode_connector_update_edid_property(connector, edid);
  26
  27         if (edid) {
  28                 err = drm_add_edid_modes(connector, edid);
  29                 kfree(edid);
  30         }
  31
  32         return err;
  33 }
  34
  35 static int tegra_connector_mode_valid(struct drm_connector *connector,
  36                                       struct drm_display_mode *mode)
  37 {
  38         struct tegra_output *output = connector_to_output(connector);
  39         enum drm_mode_status status = MODE_OK;
  40         int err;
  41
  42         err = tegra_output_check_mode(output, mode, &status);
  43         if (err < 0)
  44                 return MODE_ERROR;
  45
  46         return status;
  47 }
  48
  49 static struct drm_encoder *
  50 tegra_connector_best_encoder(struct drm_connector *connector)
  51 {
  52         struct tegra_output *output = connector_to_output(connector);
  53
  54         return &output->encoder;
  55 }
  56
  57 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  58         .get_modes = tegra_connector_get_modes,
  59         .mode_valid = tegra_connector_mode_valid,
  60         .best_encoder = tegra_connector_best_encoder,
  61 };
  62
  63 static enum drm_connector_status
  64 tegra_connector_detect(struct drm_connector *connector, bool force)
  65 {
  66         struct tegra_output *output = connector_to_output(connector);
  67         enum drm_connector_status status = connector_status_unknown;
  68
  69         if (gpio_is_valid(output->hpd_gpio)) {
  70                 if (gpio_get_value(output->hpd_gpio) == 0)
  71                         status = connector_status_disconnected;
  72                 else
  73                         status = connector_status_connected;
  74         } else {
  75                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
  76                         status = connector_status_connected;
  77         }
  78
  79         return status;
  80 }
  81
  82 static void tegra_connector_destroy(struct drm_connector *connector)
  83 {
  84         drm_sysfs_connector_remove(connector);
  85         drm_connector_cleanup(connector);
  86 }
  87
  88 static const struct drm_connector_funcs connector_funcs = {
  89         .dpms = drm_helper_connector_dpms,
  90         .detect = tegra_connector_detect,
  91         .fill_modes = drm_helper_probe_single_connector_modes,
  92         .destroy = tegra_connector_destroy,
  93 };
  94
  95 static void tegra_encoder_destroy(struct drm_encoder *encoder)
  96 {
  97         drm_encoder_cleanup(encoder);
  98 }
  99
 100 static const struct drm_encoder_funcs encoder_funcs = {
 101         .destroy = tegra_encoder_destroy,
 102 };
 103
 104 static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
 105 {
 106 }
 107
 108 static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
 109                                      const struct drm_display_mode *mode,
 110                                      struct drm_display_mode *adjusted)
 111 {
 112         return true;
 113 }
 114
 115 static void tegra_encoder_prepare(struct drm_encoder *encoder)
 116 {
 117 }
 118
 119 static void tegra_encoder_commit(struct drm_encoder *encoder)
 120 {
 121 }
 122
 123 static void tegra_encoder_mode_set(struct drm_encoder *encoder,
 124                                    struct drm_display_mode *mode,
 125                                    struct drm_display_mode *adjusted)
 126 {
 127         struct tegra_output *output = encoder_to_output(encoder);
 128         int err;
 129
 130         err = tegra_output_enable(output);
 131         if (err < 0)
 132                 dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
 133 }
 134
 135 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 136         .dpms = tegra_encoder_dpms,
 137         .mode_fixup = tegra_encoder_mode_fixup,
 138         .prepare = tegra_encoder_prepare,
 139         .commit = tegra_encoder_commit,
 140         .mode_set = tegra_encoder_mode_set,
 141 };
 142
 143 static irqreturn_t hpd_irq(int irq, void *data)
 144 {
 145         struct tegra_output *output = data;
 146
 147         drm_helper_hpd_irq_event(output->connector.dev);
 148
 149         return IRQ_HANDLED;
 150 }
 151
 152 int tegra_output_parse_dt(struct tegra_output *output)
 153 {
 154         enum of_gpio_flags flags;
 155         struct device_node *ddc;
 156         size_t size;
 157         int err;
 158
 159         if (!output->of_node)
 160                 output->of_node = output->dev->of_node;
 161
 162         output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
 163
 164         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 165         if (ddc) {
 166                 output->ddc = of_find_i2c_adapter_by_node(ddc);
 167                 if (!output->ddc) {
 168                         err = -EPROBE_DEFER;
 169                         of_node_put(ddc);
 170                         return err;
 171                 }
 172
 173                 of_node_put(ddc);
 174         }
 175
 176         if (!output->edid && !output->ddc)
 177                 return -ENODEV;
 178
 179         output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
 180                                                    "nvidia,hpd-gpio", 0,
 181                                                    &flags);
 182
 183         return 0;
 184 }
 185
 186 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 187 {
 188         int connector, encoder, err;
 189
 190         if (gpio_is_valid(output->hpd_gpio)) {
 191                 unsigned long flags;
 192
 193                 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
 194                                        "HDMI hotplug detect");
 195                 if (err < 0) {
 196                         dev_err(output->dev, "gpio_request_one(): %d\n", err);
 197                         return err;
 198                 }
 199
 200                 err = gpio_to_irq(output->hpd_gpio);
 201                 if (err < 0) {
 202                         dev_err(output->dev, "gpio_to_irq(): %d\n", err);
 203                         goto free_hpd;
 204                 }
 205
 206                 output->hpd_irq = err;
 207
 208                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 209                         IRQF_ONESHOT;
 210
 211                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 212                                            flags, "hpd", output);
 213                 if (err < 0) {
 214                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 215                                 output->hpd_irq, err);
 216                         goto free_hpd;
 217                 }
 218
 219                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 220         }
 221
 222         switch (output->type) {
 223         case TEGRA_OUTPUT_RGB:
 224                 connector = DRM_MODE_CONNECTOR_LVDS;
 225                 encoder = DRM_MODE_ENCODER_LVDS;
 226                 break;
 227
 228         case TEGRA_OUTPUT_HDMI:
 229                 connector = DRM_MODE_CONNECTOR_HDMIA;
 230                 encoder = DRM_MODE_ENCODER_TMDS;
 231                 break;
 232
 233         default:
 234                 connector = DRM_MODE_CONNECTOR_Unknown;
 235                 encoder = DRM_MODE_ENCODER_NONE;
 236                 break;
 237         }
 238
 239         drm_connector_init(drm, &output->connector, &connector_funcs,
 240                            connector);
 241         drm_connector_helper_add(&output->connector, &connector_helper_funcs);
 242
 243         drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
 244         drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
 245
 246         drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
 247         drm_sysfs_connector_add(&output->connector);
 248
 249         output->encoder.possible_crtcs = 0x3;
 250
 251         return 0;
 252
 253 free_hpd:
 254         gpio_free(output->hpd_gpio);
 255
 256         return err;
 257 }
 258
 259 int tegra_output_exit(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 }