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 <drm/drm_atomic_helper.h>
   8 #include <drm/drm_panel.h>
   9
  10 #include "drm.h"
  11 #include "dc.h"
  12
  13 #include <media/cec-notifier.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         cec_notifier_set_phys_addr_from_edid(output->cec, edid);
  37         drm_connector_update_edid_property(connector, edid);
  38
  39         if (edid) {
  40                 err = drm_add_edid_modes(connector, edid);
  41                 kfree(edid);
  42         }
  43
  44         return err;
  45 }
  46
  47 enum drm_connector_status
  48 tegra_output_connector_detect(struct drm_connector *connector, bool force)
  49 {
  50         struct tegra_output *output = connector_to_output(connector);
  51         enum drm_connector_status status = connector_status_unknown;
  52
  53         if (output->hpd_gpio) {
  54                 if (gpiod_get_value(output->hpd_gpio) == 0)
  55                         status = connector_status_disconnected;
  56                 else
  57                         status = connector_status_connected;
  58         } else {
  59                 if (!output->panel)
  60                         status = connector_status_disconnected;
  61                 else
  62                         status = connector_status_connected;
  63         }
  64
  65         if (status != connector_status_connected)
  66                 cec_notifier_phys_addr_invalidate(output->cec);
  67
  68         return status;
  69 }
  70
  71 void tegra_output_connector_destroy(struct drm_connector *connector)
  72 {
  73         drm_connector_unregister(connector);
  74         drm_connector_cleanup(connector);
  75 }
  76
  77 void tegra_output_encoder_destroy(struct drm_encoder *encoder)
  78 {
  79         drm_encoder_cleanup(encoder);
  80 }
  81
  82 static irqreturn_t hpd_irq(int irq, void *data)
  83 {
  84         struct tegra_output *output = data;
  85
  86         if (output->connector.dev)
  87                 drm_helper_hpd_irq_event(output->connector.dev);
  88
  89         return IRQ_HANDLED;
  90 }
  91
  92 int tegra_output_probe(struct tegra_output *output)
  93 {
  94         struct device_node *ddc, *panel;
  95         unsigned long flags;
  96         int err, size;
  97
  98         if (!output->of_node)
  99                 output->of_node = output->dev->of_node;
 100
 101         panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
 102         if (panel) {
 103                 output->panel = of_drm_find_panel(panel);
 104                 if (IS_ERR(output->panel))
 105                         return PTR_ERR(output->panel);
 106
 107                 of_node_put(panel);
 108         }
 109
 110         output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
 111
 112         ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
 113         if (ddc) {
 114                 output->ddc = of_find_i2c_adapter_by_node(ddc);
 115                 if (!output->ddc) {
 116                         err = -EPROBE_DEFER;
 117                         of_node_put(ddc);
 118                         return err;
 119                 }
 120
 121                 of_node_put(ddc);
 122         }
 123
 124         output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
 125                                                        output->of_node,
 126                                                        "nvidia,hpd-gpio", 0,
 127                                                        GPIOD_IN,
 128                                                        "HDMI hotplug detect");
 129         if (IS_ERR(output->hpd_gpio))
 130                 return PTR_ERR(output->hpd_gpio);
 131
 132         if (output->hpd_gpio) {
 133                 err = gpiod_to_irq(output->hpd_gpio);
 134                 if (err < 0) {
 135                         dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
 136                         return err;
 137                 }
 138
 139                 output->hpd_irq = err;
 140
 141                 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 142                         IRQF_ONESHOT;
 143
 144                 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
 145                                            flags, "hpd", output);
 146                 if (err < 0) {
 147                         dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 148                                 output->hpd_irq, err);
 149                         return err;
 150                 }
 151
 152                 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
 153
 154                 /*
 155                  * Disable the interrupt until the connector has been
 156                  * initialized to avoid a race in the hotplug interrupt
 157                  * handler.
 158                  */
 159                 disable_irq(output->hpd_irq);
 160         }
 161
 162         output->cec = cec_notifier_get(output->dev);
 163         if (!output->cec)
 164                 return -ENOMEM;
 165
 166         return 0;
 167 }
 168
 169 void tegra_output_remove(struct tegra_output *output)
 170 {
 171         if (output->cec)
 172                 cec_notifier_put(output->cec);
 173
 174         if (output->hpd_gpio)
 175                 free_irq(output->hpd_irq, output);
 176
 177         if (output->ddc)
 178                 put_device(&output->ddc->dev);
 179 }
 180
 181 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
 182 {
 183         int err;
 184
 185         if (output->panel) {
 186                 err = drm_panel_attach(output->panel, &output->connector);
 187                 if (err < 0)
 188                         return err;
 189         }
 190
 191         /*
 192          * The connector is now registered and ready to receive hotplug events
 193          * so the hotplug interrupt can be enabled.
 194          */
 195         if (output->hpd_gpio)
 196                 enable_irq(output->hpd_irq);
 197
 198         return 0;
 199 }
 200
 201 void tegra_output_exit(struct tegra_output *output)
 202 {
 203         /*
 204          * The connector is going away, so the interrupt must be disabled to
 205          * prevent the hotplug interrupt handler from potentially crashing.
 206          */
 207         if (output->hpd_gpio)
 208                 disable_irq(output->hpd_irq);
 209
 210         if (output->panel)
 211                 drm_panel_detach(output->panel);
 212 }
 213
 214 void tegra_output_find_possible_crtcs(struct tegra_output *output,
 215                                       struct drm_device *drm)
 216 {
 217         struct device *dev = output->dev;
 218         struct drm_crtc *crtc;
 219         unsigned int mask = 0;
 220
 221         drm_for_each_crtc(crtc, drm) {
 222                 struct tegra_dc *dc = to_tegra_dc(crtc);
 223
 224                 if (tegra_dc_has_output(dc, dev))
 225                         mask |= drm_crtc_mask(crtc);
 226         }
 227
 228         if (mask == 0) {
 229                 dev_warn(dev, "missing output definition for heads in DT\n");
 230                 mask = 0x3;
 231         }
 232
 233         output->encoder.possible_crtcs = mask;
 234 }