drivers/gpu/drm/tegra/output.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Avionic Design GmbH
   4  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
   5  */
   6
   7 #include <linux/i2c.h>
   8 #include <linux/of.h>
   9
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_edid.h>
  12 #include <drm/drm_of.h>
  13 #include <drm/drm_panel.h>
  14 #include <drm/drm_simple_kms_helper.h>
  15
  16 #include "drm.h"
  17 #include "dc.h"
  18
  19 #include <media/cec-notifier.h>
  20
  21 int tegra_output_connector_get_modes(struct drm_connector *connector)
  22 {
  23         struct tegra_output *output = connector_to_output(connector);
  24         const struct drm_edid *drm_edid = NULL;
  25         int err = 0;
  26
  27         /*
  28          * If the panel provides one or more modes, use them exclusively and
  29          * ignore any other means of obtaining a mode.
  30          */
  31         if (output->panel) {
  32                 err = drm_panel_get_modes(output->panel, connector);
  33                 if (err > 0)
  34                         return err;
  35         }
  36
  37         if (output->drm_edid)
  38                 drm_edid = drm_edid_dup(output->drm_edid);
  39         else if (output->ddc)
  40                 drm_edid = drm_edid_read_ddc(connector, output->ddc);
  41
  42         drm_edid_connector_update(connector, drm_edid);
  43         cec_notifier_set_phys_addr(output->cec,
  44                                    connector->display_info.source_physical_address);
  45
  46         err = drm_edid_connector_add_modes(connector);
  47         drm_edid_free(drm_edid);
  48
  49         return err;
  50 }
  51
  52 enum drm_connector_status
  53 tegra_output_connector_detect(struct drm_connector *connector, bool force)
  54 {
  55         struct tegra_output *output = connector_to_output(connector);
  56         enum drm_connector_status status = connector_status_unknown;
  57
  58         if (output->hpd_gpio) {
  59                 if (gpiod_get_value(output->hpd_gpio) == 0)
  60                         status = connector_status_disconnected;
  61                 else
  62                         status = connector_status_connected;
  63         } else {
  64                 if (!output->panel)
  65                         status = connector_status_disconnected;
  66                 else
  67                         status = connector_status_connected;
  68         }
  69
  70         if (status != connector_status_connected)
  71                 cec_notifier_phys_addr_invalidate(output->cec);
  72
  73         return status;
  74 }
  75
  76 void tegra_output_connector_destroy(struct drm_connector *connector)
  77 {
  78         struct tegra_output *output = connector_to_output(connector);
  79
  80         if (output->cec)
  81                 cec_notifier_conn_unregister(output->cec);
  82
  83         drm_connector_unregister(connector);
  84         drm_connector_cleanup(connector);
  85 }
  86
  87 static irqreturn_t hpd_irq(int irq, void *data)
  88 {
  89         struct tegra_output *output = data;
  90
  91         if (output->connector.dev)
  92                 drm_helper_hpd_irq_event(output->connector.dev);
  93
  94         return IRQ_HANDLED;
  95 }
  96
  97 int tegra_output_probe(struct tegra_output *output)
  98 {
  99         struct device_node *ddc, *panel;
 100         const void *edid;
 101         unsigned long flags;
 102         int err, size;
 103
 104         if (!output->of_node)
 105                 output->of_node = output->dev->of_node;
 106
 107         err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
 108                                           &output->panel, &output->bridge);
 109         if (err && err != -ENODEV)
 110                 return err;
 111
 112         panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
 113         if (panel) {
 114                 /*
 115                  * Don't mix nvidia,panel phandle with the graph in a
 116                  * device-tree.
 117                  */
 118                 WARN_ON(output->panel || output->bridge);
 119
 120                 output->panel = of_drm_find_panel(panel);
 121                 of_node_put(panel);
 122
 123                 if (IS_ERR(output->panel))
 124                         return PTR_ERR(output->panel);
 125         }
 126
 127         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 128         if (ddc) {
 129                 output->ddc = of_get_i2c_adapter_by_node(ddc);
 130                 of_node_put(ddc);
 131
 132                 if (!output->ddc) {
 133                         err = -EPROBE_DEFER;
 134                         return err;
 135                 }
 136         }
 137
 138         edid = of_get_property(output->of_node, "nvidia,edid", &size);
 139         output->drm_edid = drm_edid_alloc(edid, size);
 140
 141         output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
 142                                         of_fwnode_handle(output->of_node),
 143                                         "nvidia,hpd",
 144                                         GPIOD_IN,
 145                                         "HDMI hotplug detect");
 146         if (IS_ERR(output->hpd_gpio)) {
 147                 if (PTR_ERR(output->hpd_gpio) != -ENOENT) {
 148                         err = PTR_ERR(output->hpd_gpio);
 149                         goto put_i2c;
 150                 }
 151
 152                 output->hpd_gpio = NULL;
 153         }
 154
 155         if (output->hpd_gpio) {
 156                 err = gpiod_to_irq(output->hpd_gpio);
 157                 if (err < 0) {
 158                         dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
 159                         goto put_i2c;
 160                 }
 161
 162                 output->hpd_irq = err;
 163
 164                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 165                         IRQF_ONESHOT;
 166
 167                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 168                                            flags, "hpd", output);
 169                 if (err < 0) {
 170                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 171                                 output->hpd_irq, err);
 172                         goto put_i2c;
 173                 }
 174
 175                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 176
 177                 /*
 178                  * Disable the interrupt until the connector has been
 179                  * initialized to avoid a race in the hotplug interrupt
 180                  * handler.
 181                  */
 182                 disable_irq(output->hpd_irq);
 183         }
 184
 185         return 0;
 186
 187 put_i2c:
 188         if (output->ddc)
 189                 i2c_put_adapter(output->ddc);
 190
 191         drm_edid_free(output->drm_edid);
 192
 193         return err;
 194 }
 195
 196 void tegra_output_remove(struct tegra_output *output)
 197 {
 198         if (output->hpd_gpio)
 199                 free_irq(output->hpd_irq, output);
 200
 201         if (output->ddc)
 202                 i2c_put_adapter(output->ddc);
 203
 204         drm_edid_free(output->drm_edid);
 205 }
 206
 207 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 208 {
 209         int connector_type;
 210
 211         /*
 212          * The connector is now registered and ready to receive hotplug events
 213          * so the hotplug interrupt can be enabled.
 214          */
 215         if (output->hpd_gpio)
 216                 enable_irq(output->hpd_irq);
 217
 218         connector_type = output->connector.connector_type;
 219         /*
 220          * Create a CEC notifier for HDMI connector.
 221          */
 222         if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
 223             connector_type == DRM_MODE_CONNECTOR_HDMIB) {
 224                 struct cec_connector_info conn_info;
 225
 226                 cec_fill_conn_info_from_drm(&conn_info, &output->connector);
 227                 output->cec = cec_notifier_conn_register(output->dev, NULL,
 228                                                          &conn_info);
 229                 if (!output->cec)
 230                         return -ENOMEM;
 231         }
 232
 233         return 0;
 234 }
 235
 236 void tegra_output_exit(struct tegra_output *output)
 237 {
 238         /*
 239          * The connector is going away, so the interrupt must be disabled to
 240          * prevent the hotplug interrupt handler from potentially crashing.
 241          */
 242         if (output->hpd_gpio)
 243                 disable_irq(output->hpd_irq);
 244 }
 245
 246 void tegra_output_find_possible_crtcs(struct tegra_output *output,
 247                                       struct drm_device *drm)
 248 {
 249         struct device *dev = output->dev;
 250         struct drm_crtc *crtc;
 251         unsigned int mask = 0;
 252
 253         drm_for_each_crtc(crtc, drm) {
 254                 struct tegra_dc *dc = to_tegra_dc(crtc);
 255
 256                 if (tegra_dc_has_output(dc, dev))
 257                         mask |= drm_crtc_mask(crtc);
 258         }
 259
 260         if (mask == 0) {
 261                 dev_warn(dev, "missing output definition for heads in DT\n");
 262                 mask = 0x3;
 263         }
 264
 265         output->encoder.possible_crtcs = mask;
 266 }
 267
 268 int tegra_output_suspend(struct tegra_output *output)
 269 {
 270         if (output->hpd_irq)
 271                 disable_irq(output->hpd_irq);
 272
 273         return 0;
 274 }
 275
 276 int tegra_output_resume(struct tegra_output *output)
 277 {
 278         if (output->hpd_irq)
 279                 enable_irq(output->hpd_irq);
 280
 281         return 0;
 282 }