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_of.h>
 12#include <drm/drm_panel.h>
 13#include <drm/drm_simple_kms_helper.h>
 14
 15#include "drm.h"
 16#include "dc.h"
 17
 18#include <media/cec-notifier.h>
 19
 20int tegra_output_connector_get_modes(struct drm_connector *connector)
 21{
 22	struct tegra_output *output = connector_to_output(connector);
 23	struct edid *edid = NULL;
 24	int err = 0;
 25
 26	/*
 27	 * If the panel provides one or more modes, use them exclusively and
 28	 * ignore any other means of obtaining a mode.
 29	 */
 30	if (output->panel) {
 31		err = drm_panel_get_modes(output->panel, connector);
 32		if (err > 0)
 33			return err;
 34	}
 35
 36	if (output->edid)
 37		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
 38	else if (output->ddc)
 39		edid = drm_get_edid(connector, output->ddc);
 40
 41	cec_notifier_set_phys_addr_from_edid(output->cec, edid);
 42	drm_connector_update_edid_property(connector, edid);
 43
 44	if (edid) {
 45		err = drm_add_edid_modes(connector, edid);
 46		kfree(edid);
 47	}
 48
 49	return err;
 50}
 51
 52enum drm_connector_status
 53tegra_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
 76void 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
 87static 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
 97int tegra_output_probe(struct tegra_output *output)
 98{
 99	struct device_node *ddc, *panel;
100	unsigned long flags;
101	int err, size;
102
103	if (!output->of_node)
104		output->of_node = output->dev->of_node;
105
106	err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
107					  &output->panel, &output->bridge);
108	if (err && err != -ENODEV)
109		return err;
110
111	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
112	if (panel) {
113		/*
114		 * Don't mix nvidia,panel phandle with the graph in a
115		 * device-tree.
116		 */
117		WARN_ON(output->panel || output->bridge);
118
119		output->panel = of_drm_find_panel(panel);
120		of_node_put(panel);
121
122		if (IS_ERR(output->panel))
123			return PTR_ERR(output->panel);
124	}
125
126	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
127
128	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
129	if (ddc) {
130		output->ddc = of_get_i2c_adapter_by_node(ddc);
131		of_node_put(ddc);
132
133		if (!output->ddc) {
134			err = -EPROBE_DEFER;
135			return err;
136		}
137	}
138
139	output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
140					of_fwnode_handle(output->of_node),
141					"nvidia,hpd",
142					GPIOD_IN,
143					"HDMI hotplug detect");
144	if (IS_ERR(output->hpd_gpio)) {
145		if (PTR_ERR(output->hpd_gpio) != -ENOENT)
146			return PTR_ERR(output->hpd_gpio);
147
148		output->hpd_gpio = NULL;
149	}
150
151	if (output->hpd_gpio) {
152		err = gpiod_to_irq(output->hpd_gpio);
153		if (err < 0) {
154			dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
155			return err;
156		}
157
158		output->hpd_irq = err;
159
160		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
161			IRQF_ONESHOT;
162
163		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
164					   flags, "hpd", output);
165		if (err < 0) {
166			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
167				output->hpd_irq, err);
168			return err;
169		}
170
171		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
172
173		/*
174		 * Disable the interrupt until the connector has been
175		 * initialized to avoid a race in the hotplug interrupt
176		 * handler.
177		 */
178		disable_irq(output->hpd_irq);
179	}
180
181	return 0;
182}
183
184void tegra_output_remove(struct tegra_output *output)
185{
186	if (output->hpd_gpio)
187		free_irq(output->hpd_irq, output);
188
189	if (output->ddc)
190		i2c_put_adapter(output->ddc);
191}
192
193int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
194{
195	int connector_type;
196
197	/*
198	 * The connector is now registered and ready to receive hotplug events
199	 * so the hotplug interrupt can be enabled.
200	 */
201	if (output->hpd_gpio)
202		enable_irq(output->hpd_irq);
203
204	connector_type = output->connector.connector_type;
205	/*
206	 * Create a CEC notifier for HDMI connector.
207	 */
208	if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
209	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
210		struct cec_connector_info conn_info;
211
212		cec_fill_conn_info_from_drm(&conn_info, &output->connector);
213		output->cec = cec_notifier_conn_register(output->dev, NULL,
214							 &conn_info);
215		if (!output->cec)
216			return -ENOMEM;
217	}
218
219	return 0;
220}
221
222void tegra_output_exit(struct tegra_output *output)
223{
224	/*
225	 * The connector is going away, so the interrupt must be disabled to
226	 * prevent the hotplug interrupt handler from potentially crashing.
227	 */
228	if (output->hpd_gpio)
229		disable_irq(output->hpd_irq);
230}
231
232void tegra_output_find_possible_crtcs(struct tegra_output *output,
233				      struct drm_device *drm)
234{
235	struct device *dev = output->dev;
236	struct drm_crtc *crtc;
237	unsigned int mask = 0;
238
239	drm_for_each_crtc(crtc, drm) {
240		struct tegra_dc *dc = to_tegra_dc(crtc);
241
242		if (tegra_dc_has_output(dc, dev))
243			mask |= drm_crtc_mask(crtc);
244	}
245
246	if (mask == 0) {
247		dev_warn(dev, "missing output definition for heads in DT\n");
248		mask = 0x3;
249	}
250
251	output->encoder.possible_crtcs = mask;
252}
253
254int tegra_output_suspend(struct tegra_output *output)
255{
256	if (output->hpd_irq)
257		disable_irq(output->hpd_irq);
258
259	return 0;
260}
261
262int tegra_output_resume(struct tegra_output *output)
263{
264	if (output->hpd_irq)
265		enable_irq(output->hpd_irq);
266
267	return 0;
268}