1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Avionic Design GmbH
4 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
7 #include <drm/drm_atomic_helper.h>
8 #include <drm/drm_of.h>
9 #include <drm/drm_panel.h>
10 #include <drm/drm_simple_kms_helper.h>
15 #include <media/cec-notifier.h>
17 int tegra_output_connector_get_modes(struct drm_connector *connector)
19 struct tegra_output *output = connector_to_output(connector);
20 struct edid *edid = NULL;
24 * If the panel provides one or more modes, use them exclusively and
25 * ignore any other means of obtaining a mode.
28 err = drm_panel_get_modes(output->panel, connector);
34 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
36 edid = drm_get_edid(connector, output->ddc);
38 cec_notifier_set_phys_addr_from_edid(output->cec, edid);
39 drm_connector_update_edid_property(connector, edid);
42 err = drm_add_edid_modes(connector, edid);
49 enum drm_connector_status
50 tegra_output_connector_detect(struct drm_connector *connector, bool force)
52 struct tegra_output *output = connector_to_output(connector);
53 enum drm_connector_status status = connector_status_unknown;
55 if (output->hpd_gpio) {
56 if (gpiod_get_value(output->hpd_gpio) == 0)
57 status = connector_status_disconnected;
59 status = connector_status_connected;
62 status = connector_status_disconnected;
64 status = connector_status_connected;
67 if (status != connector_status_connected)
68 cec_notifier_phys_addr_invalidate(output->cec);
73 void tegra_output_connector_destroy(struct drm_connector *connector)
75 struct tegra_output *output = connector_to_output(connector);
78 cec_notifier_conn_unregister(output->cec);
80 drm_connector_unregister(connector);
81 drm_connector_cleanup(connector);
84 static irqreturn_t hpd_irq(int irq, void *data)
86 struct tegra_output *output = data;
88 if (output->connector.dev)
89 drm_helper_hpd_irq_event(output->connector.dev);
94 int tegra_output_probe(struct tegra_output *output)
96 struct device_node *ddc, *panel;
100 if (!output->of_node)
101 output->of_node = output->dev->of_node;
103 err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
104 &output->panel, &output->bridge);
105 if (err && err != -ENODEV)
108 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
111 * Don't mix nvidia,panel phandle with the graph in a
114 WARN_ON(output->panel || output->bridge);
116 output->panel = of_drm_find_panel(panel);
119 if (IS_ERR(output->panel))
120 return PTR_ERR(output->panel);
123 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
125 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
127 output->ddc = of_get_i2c_adapter_by_node(ddc);
137 output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
139 "nvidia,hpd-gpio", 0,
141 "HDMI hotplug detect");
142 if (IS_ERR(output->hpd_gpio)) {
143 if (PTR_ERR(output->hpd_gpio) != -ENOENT)
144 return PTR_ERR(output->hpd_gpio);
146 output->hpd_gpio = NULL;
149 if (output->hpd_gpio) {
150 err = gpiod_to_irq(output->hpd_gpio);
152 dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
156 output->hpd_irq = err;
158 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
161 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
162 flags, "hpd", output);
164 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
165 output->hpd_irq, err);
169 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
172 * Disable the interrupt until the connector has been
173 * initialized to avoid a race in the hotplug interrupt
176 disable_irq(output->hpd_irq);
182 void tegra_output_remove(struct tegra_output *output)
184 if (output->hpd_gpio)
185 free_irq(output->hpd_irq, output);
188 i2c_put_adapter(output->ddc);
191 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
196 * The connector is now registered and ready to receive hotplug events
197 * so the hotplug interrupt can be enabled.
199 if (output->hpd_gpio)
200 enable_irq(output->hpd_irq);
202 connector_type = output->connector.connector_type;
204 * Create a CEC notifier for HDMI connector.
206 if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
207 connector_type == DRM_MODE_CONNECTOR_HDMIB) {
208 struct cec_connector_info conn_info;
210 cec_fill_conn_info_from_drm(&conn_info, &output->connector);
211 output->cec = cec_notifier_conn_register(output->dev, NULL,
220 void tegra_output_exit(struct tegra_output *output)
223 * The connector is going away, so the interrupt must be disabled to
224 * prevent the hotplug interrupt handler from potentially crashing.
226 if (output->hpd_gpio)
227 disable_irq(output->hpd_irq);
230 void tegra_output_find_possible_crtcs(struct tegra_output *output,
231 struct drm_device *drm)
233 struct device *dev = output->dev;
234 struct drm_crtc *crtc;
235 unsigned int mask = 0;
237 drm_for_each_crtc(crtc, drm) {
238 struct tegra_dc *dc = to_tegra_dc(crtc);
240 if (tegra_dc_has_output(dc, dev))
241 mask |= drm_crtc_mask(crtc);
245 dev_warn(dev, "missing output definition for heads in DT\n");
249 output->encoder.possible_crtcs = mask;
252 int tegra_output_suspend(struct tegra_output *output)
255 disable_irq(output->hpd_irq);
260 int tegra_output_resume(struct tegra_output *output)
263 enable_irq(output->hpd_irq);