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 #include <drm/drm_simple_kms_helper.h> 10 11 #include "drm.h" 12 #include "dc.h" 13 14 #include <media/cec-notifier.h> 15 16 int tegra_output_connector_get_modes(struct drm_connector *connector) 17 { 18 struct tegra_output *output = connector_to_output(connector); 19 struct edid *edid = NULL; 20 int err = 0; 21 22 /* 23 * If the panel provides one or more modes, use them exclusively and 24 * ignore any other means of obtaining a mode. 25 */ 26 if (output->panel) { 27 err = drm_panel_get_modes(output->panel, connector); 28 if (err > 0) 29 return err; 30 } 31 32 if (output->edid) 33 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL); 34 else if (output->ddc) 35 edid = drm_get_edid(connector, output->ddc); 36 37 cec_notifier_set_phys_addr_from_edid(output->cec, edid); 38 drm_connector_update_edid_property(connector, edid); 39 40 if (edid) { 41 err = drm_add_edid_modes(connector, edid); 42 kfree(edid); 43 } 44 45 return err; 46 } 47 48 enum drm_connector_status 49 tegra_output_connector_detect(struct drm_connector *connector, bool force) 50 { 51 struct tegra_output *output = connector_to_output(connector); 52 enum drm_connector_status status = connector_status_unknown; 53 54 if (output->hpd_gpio) { 55 if (gpiod_get_value(output->hpd_gpio) == 0) 56 status = connector_status_disconnected; 57 else 58 status = connector_status_connected; 59 } else { 60 if (!output->panel) 61 status = connector_status_disconnected; 62 else 63 status = connector_status_connected; 64 } 65 66 if (status != connector_status_connected) 67 cec_notifier_phys_addr_invalidate(output->cec); 68 69 return status; 70 } 71 72 void tegra_output_connector_destroy(struct drm_connector *connector) 73 { 74 struct tegra_output *output = connector_to_output(connector); 75 76 if (output->cec) 77 cec_notifier_conn_unregister(output->cec); 78 79 drm_connector_unregister(connector); 80 drm_connector_cleanup(connector); 81 } 82 83 static irqreturn_t hpd_irq(int irq, void *data) 84 { 85 struct tegra_output *output = data; 86 87 if (output->connector.dev) 88 drm_helper_hpd_irq_event(output->connector.dev); 89 90 return IRQ_HANDLED; 91 } 92 93 int tegra_output_probe(struct tegra_output *output) 94 { 95 struct device_node *ddc, *panel; 96 unsigned long flags; 97 int err, size; 98 99 if (!output->of_node) 100 output->of_node = output->dev->of_node; 101 102 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0); 103 if (panel) { 104 output->panel = of_drm_find_panel(panel); 105 if (IS_ERR(output->panel)) 106 return PTR_ERR(output->panel); 107 108 of_node_put(panel); 109 } 110 111 output->edid = of_get_property(output->of_node, "nvidia,edid", &size); 112 113 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0); 114 if (ddc) { 115 output->ddc = of_find_i2c_adapter_by_node(ddc); 116 if (!output->ddc) { 117 err = -EPROBE_DEFER; 118 of_node_put(ddc); 119 return err; 120 } 121 122 of_node_put(ddc); 123 } 124 125 output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev, 126 output->of_node, 127 "nvidia,hpd-gpio", 0, 128 GPIOD_IN, 129 "HDMI hotplug detect"); 130 if (IS_ERR(output->hpd_gpio)) { 131 if (PTR_ERR(output->hpd_gpio) != -ENOENT) 132 return PTR_ERR(output->hpd_gpio); 133 134 output->hpd_gpio = NULL; 135 } 136 137 if (output->hpd_gpio) { 138 err = gpiod_to_irq(output->hpd_gpio); 139 if (err < 0) { 140 dev_err(output->dev, "gpiod_to_irq(): %d\n", err); 141 return err; 142 } 143 144 output->hpd_irq = err; 145 146 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | 147 IRQF_ONESHOT; 148 149 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq, 150 flags, "hpd", output); 151 if (err < 0) { 152 dev_err(output->dev, "failed to request IRQ#%u: %d\n", 153 output->hpd_irq, err); 154 return err; 155 } 156 157 output->connector.polled = DRM_CONNECTOR_POLL_HPD; 158 159 /* 160 * Disable the interrupt until the connector has been 161 * initialized to avoid a race in the hotplug interrupt 162 * handler. 163 */ 164 disable_irq(output->hpd_irq); 165 } 166 167 return 0; 168 } 169 170 void tegra_output_remove(struct tegra_output *output) 171 { 172 if (output->hpd_gpio) 173 free_irq(output->hpd_irq, output); 174 175 if (output->ddc) 176 put_device(&output->ddc->dev); 177 } 178 179 int tegra_output_init(struct drm_device *drm, struct tegra_output *output) 180 { 181 int connector_type; 182 int err; 183 184 if (output->panel) { 185 err = drm_panel_attach(output->panel, &output->connector); 186 if (err < 0) 187 return err; 188 } 189 190 /* 191 * The connector is now registered and ready to receive hotplug events 192 * so the hotplug interrupt can be enabled. 193 */ 194 if (output->hpd_gpio) 195 enable_irq(output->hpd_irq); 196 197 connector_type = output->connector.connector_type; 198 /* 199 * Create a CEC notifier for HDMI connector. 200 */ 201 if (connector_type == DRM_MODE_CONNECTOR_HDMIA || 202 connector_type == DRM_MODE_CONNECTOR_HDMIB) { 203 struct cec_connector_info conn_info; 204 205 cec_fill_conn_info_from_drm(&conn_info, &output->connector); 206 output->cec = cec_notifier_conn_register(output->dev, NULL, 207 &conn_info); 208 if (!output->cec) 209 return -ENOMEM; 210 } 211 212 return 0; 213 } 214 215 void tegra_output_exit(struct tegra_output *output) 216 { 217 /* 218 * The connector is going away, so the interrupt must be disabled to 219 * prevent the hotplug interrupt handler from potentially crashing. 220 */ 221 if (output->hpd_gpio) 222 disable_irq(output->hpd_irq); 223 224 if (output->panel) 225 drm_panel_detach(output->panel); 226 } 227 228 void tegra_output_find_possible_crtcs(struct tegra_output *output, 229 struct drm_device *drm) 230 { 231 struct device *dev = output->dev; 232 struct drm_crtc *crtc; 233 unsigned int mask = 0; 234 235 drm_for_each_crtc(crtc, drm) { 236 struct tegra_dc *dc = to_tegra_dc(crtc); 237 238 if (tegra_dc_has_output(dc, dev)) 239 mask |= drm_crtc_mask(crtc); 240 } 241 242 if (mask == 0) { 243 dev_warn(dev, "missing output definition for heads in DT\n"); 244 mask = 0x3; 245 } 246 247 output->encoder.possible_crtcs = mask; 248 } 249 250 int tegra_output_suspend(struct tegra_output *output) 251 { 252 if (output->hpd_irq) 253 disable_irq(output->hpd_irq); 254 255 return 0; 256 } 257 258 int tegra_output_resume(struct tegra_output *output) 259 { 260 if (output->hpd_irq) 261 enable_irq(output->hpd_irq); 262 263 return 0; 264 } 265