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			err = PTR_ERR(output->hpd_gpio);
147			goto put_i2c;
148		}
149
150		output->hpd_gpio = NULL;
151	}
152
153	if (output->hpd_gpio) {
154		err = gpiod_to_irq(output->hpd_gpio);
155		if (err < 0) {
156			dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
157			goto put_i2c;
158		}
159
160		output->hpd_irq = err;
161
162		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
163			IRQF_ONESHOT;
164
165		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
166					   flags, "hpd", output);
167		if (err < 0) {
168			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
169				output->hpd_irq, err);
170			goto put_i2c;
171		}
172
173		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
174
175		/*
176		 * Disable the interrupt until the connector has been
177		 * initialized to avoid a race in the hotplug interrupt
178		 * handler.
179		 */
180		disable_irq(output->hpd_irq);
181	}
182
183	return 0;
184
185put_i2c:
186	if (output->ddc)
187		i2c_put_adapter(output->ddc);
188
189	return err;
190}
191
192void tegra_output_remove(struct tegra_output *output)
193{
194	if (output->hpd_gpio)
195		free_irq(output->hpd_irq, output);
196
197	if (output->ddc)
198		i2c_put_adapter(output->ddc);
199}
200
201int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
202{
203	int connector_type;
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 (output->hpd_gpio)
210		enable_irq(output->hpd_irq);
211
212	connector_type = output->connector.connector_type;
213	/*
214	 * Create a CEC notifier for HDMI connector.
215	 */
216	if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
217	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
218		struct cec_connector_info conn_info;
219
220		cec_fill_conn_info_from_drm(&conn_info, &output->connector);
221		output->cec = cec_notifier_conn_register(output->dev, NULL,
222							 &conn_info);
223		if (!output->cec)
224			return -ENOMEM;
225	}
226
227	return 0;
228}
229
230void tegra_output_exit(struct tegra_output *output)
231{
232	/*
233	 * The connector is going away, so the interrupt must be disabled to
234	 * prevent the hotplug interrupt handler from potentially crashing.
235	 */
236	if (output->hpd_gpio)
237		disable_irq(output->hpd_irq);
238}
239
240void tegra_output_find_possible_crtcs(struct tegra_output *output,
241				      struct drm_device *drm)
242{
243	struct device *dev = output->dev;
244	struct drm_crtc *crtc;
245	unsigned int mask = 0;
246
247	drm_for_each_crtc(crtc, drm) {
248		struct tegra_dc *dc = to_tegra_dc(crtc);
249
250		if (tegra_dc_has_output(dc, dev))
251			mask |= drm_crtc_mask(crtc);
252	}
253
254	if (mask == 0) {
255		dev_warn(dev, "missing output definition for heads in DT\n");
256		mask = 0x3;
257	}
258
259	output->encoder.possible_crtcs = mask;
260}
261
262int tegra_output_suspend(struct tegra_output *output)
263{
264	if (output->hpd_irq)
265		disable_irq(output->hpd_irq);
266
267	return 0;
268}
269
270int tegra_output_resume(struct tegra_output *output)
271{
272	if (output->hpd_irq)
273		enable_irq(output->hpd_irq);
274
275	return 0;
276}
277