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 (gpio_is_valid(output->hpd_gpio)) { 54 if (output->hpd_gpio_flags & OF_GPIO_ACTIVE_LOW) { 55 if (gpio_get_value(output->hpd_gpio) != 0) 56 status = connector_status_disconnected; 57 else 58 status = connector_status_connected; 59 } else { 60 if (gpio_get_value(output->hpd_gpio) == 0) 61 status = connector_status_disconnected; 62 else 63 status = connector_status_connected; 64 } 65 } else { 66 if (!output->panel) 67 status = connector_status_disconnected; 68 else 69 status = connector_status_connected; 70 } 71 72 if (status != connector_status_connected) 73 cec_notifier_phys_addr_invalidate(output->cec); 74 75 return status; 76 } 77 78 void tegra_output_connector_destroy(struct drm_connector *connector) 79 { 80 drm_connector_unregister(connector); 81 drm_connector_cleanup(connector); 82 } 83 84 void tegra_output_encoder_destroy(struct drm_encoder *encoder) 85 { 86 drm_encoder_cleanup(encoder); 87 } 88 89 static irqreturn_t hpd_irq(int irq, void *data) 90 { 91 struct tegra_output *output = data; 92 93 if (output->connector.dev) 94 drm_helper_hpd_irq_event(output->connector.dev); 95 96 return IRQ_HANDLED; 97 } 98 99 int tegra_output_probe(struct tegra_output *output) 100 { 101 struct device_node *ddc, *panel; 102 int err, size; 103 104 if (!output->of_node) 105 output->of_node = output->dev->of_node; 106 107 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0); 108 if (panel) { 109 output->panel = of_drm_find_panel(panel); 110 if (IS_ERR(output->panel)) 111 return PTR_ERR(output->panel); 112 113 of_node_put(panel); 114 } 115 116 output->edid = of_get_property(output->of_node, "nvidia,edid", &size); 117 118 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0); 119 if (ddc) { 120 output->ddc = of_find_i2c_adapter_by_node(ddc); 121 if (!output->ddc) { 122 err = -EPROBE_DEFER; 123 of_node_put(ddc); 124 return err; 125 } 126 127 of_node_put(ddc); 128 } 129 130 output->hpd_gpio = of_get_named_gpio_flags(output->of_node, 131 "nvidia,hpd-gpio", 0, 132 &output->hpd_gpio_flags); 133 if (gpio_is_valid(output->hpd_gpio)) { 134 unsigned long flags; 135 136 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN, 137 "HDMI hotplug detect"); 138 if (err < 0) { 139 dev_err(output->dev, "gpio_request_one(): %d\n", err); 140 return err; 141 } 142 143 err = gpio_to_irq(output->hpd_gpio); 144 if (err < 0) { 145 dev_err(output->dev, "gpio_to_irq(): %d\n", err); 146 gpio_free(output->hpd_gpio); 147 return err; 148 } 149 150 output->hpd_irq = err; 151 152 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | 153 IRQF_ONESHOT; 154 155 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq, 156 flags, "hpd", output); 157 if (err < 0) { 158 dev_err(output->dev, "failed to request IRQ#%u: %d\n", 159 output->hpd_irq, err); 160 gpio_free(output->hpd_gpio); 161 return err; 162 } 163 164 output->connector.polled = DRM_CONNECTOR_POLL_HPD; 165 166 /* 167 * Disable the interrupt until the connector has been 168 * initialized to avoid a race in the hotplug interrupt 169 * handler. 170 */ 171 disable_irq(output->hpd_irq); 172 } 173 174 output->cec = cec_notifier_get(output->dev); 175 if (!output->cec) 176 return -ENOMEM; 177 178 return 0; 179 } 180 181 void tegra_output_remove(struct tegra_output *output) 182 { 183 if (output->cec) 184 cec_notifier_put(output->cec); 185 186 if (gpio_is_valid(output->hpd_gpio)) { 187 free_irq(output->hpd_irq, output); 188 gpio_free(output->hpd_gpio); 189 } 190 191 if (output->ddc) 192 put_device(&output->ddc->dev); 193 } 194 195 int tegra_output_init(struct drm_device *drm, struct tegra_output *output) 196 { 197 int err; 198 199 if (output->panel) { 200 err = drm_panel_attach(output->panel, &output->connector); 201 if (err < 0) 202 return err; 203 } 204 205 /* 206 * The connector is now registered and ready to receive hotplug events 207 * so the hotplug interrupt can be enabled. 208 */ 209 if (gpio_is_valid(output->hpd_gpio)) 210 enable_irq(output->hpd_irq); 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 (gpio_is_valid(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