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1/*
2 * Copyright (C) 2012 Avionic Design GmbH
3 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <drm/drm_atomic_helper.h>
11#include <drm/drm_panel.h>
12#include "drm.h"
13
14int tegra_output_connector_get_modes(struct drm_connector *connector)
15{
16 struct tegra_output *output = connector_to_output(connector);
17 struct edid *edid = NULL;
18 int err = 0;
19
20 /*
21 * If the panel provides one or more modes, use them exclusively and
22 * ignore any other means of obtaining a mode.
23 */
24 if (output->panel) {
25 err = output->panel->funcs->get_modes(output->panel);
26 if (err > 0)
27 return err;
28 }
29
30 if (output->edid)
31 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
32 else if (output->ddc)
33 edid = drm_get_edid(connector, output->ddc);
34
35 drm_mode_connector_update_edid_property(connector, edid);
36
37 if (edid) {
38 err = drm_add_edid_modes(connector, edid);
39 kfree(edid);
40 }
41
42 return err;
43}
44
45struct drm_encoder *
46tegra_output_connector_best_encoder(struct drm_connector *connector)
47{
48 struct tegra_output *output = connector_to_output(connector);
49
50 return &output->encoder;
51}
52
53enum drm_connector_status
54tegra_output_connector_detect(struct drm_connector *connector, bool force)
55{
56 struct tegra_output *output = connector_to_output(connector);
57 enum drm_connector_status status = connector_status_unknown;
58
59 if (gpio_is_valid(output->hpd_gpio)) {
60 if (output->hpd_gpio_flags & OF_GPIO_ACTIVE_LOW) {
61 if (gpio_get_value(output->hpd_gpio) != 0)
62 status = connector_status_disconnected;
63 else
64 status = connector_status_connected;
65 } else {
66 if (gpio_get_value(output->hpd_gpio) == 0)
67 status = connector_status_disconnected;
68 else
69 status = connector_status_connected;
70 }
71 } else {
72 if (!output->panel)
73 status = connector_status_disconnected;
74 else
75 status = connector_status_connected;
76 }
77
78 return status;
79}
80
81void tegra_output_connector_destroy(struct drm_connector *connector)
82{
83 drm_connector_unregister(connector);
84 drm_connector_cleanup(connector);
85}
86
87void tegra_output_encoder_destroy(struct drm_encoder *encoder)
88{
89 drm_encoder_cleanup(encoder);
90}
91
92static irqreturn_t hpd_irq(int irq, void *data)
93{
94 struct tegra_output *output = data;
95
96 if (output->connector.dev)
97 drm_helper_hpd_irq_event(output->connector.dev);
98
99 return IRQ_HANDLED;
100}
101
102int tegra_output_probe(struct tegra_output *output)
103{
104 struct device_node *ddc, *panel;
105 int err, size;
106
107 if (!output->of_node)
108 output->of_node = output->dev->of_node;
109
110 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
111 if (panel) {
112 output->panel = of_drm_find_panel(panel);
113 if (!output->panel)
114 return -EPROBE_DEFER;
115
116 of_node_put(panel);
117 }
118
119 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
120
121 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
122 if (ddc) {
123 output->ddc = of_find_i2c_adapter_by_node(ddc);
124 if (!output->ddc) {
125 err = -EPROBE_DEFER;
126 of_node_put(ddc);
127 return err;
128 }
129
130 of_node_put(ddc);
131 }
132
133 output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
134 "nvidia,hpd-gpio", 0,
135 &output->hpd_gpio_flags);
136 if (gpio_is_valid(output->hpd_gpio)) {
137 unsigned long flags;
138
139 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
140 "HDMI hotplug detect");
141 if (err < 0) {
142 dev_err(output->dev, "gpio_request_one(): %d\n", err);
143 return err;
144 }
145
146 err = gpio_to_irq(output->hpd_gpio);
147 if (err < 0) {
148 dev_err(output->dev, "gpio_to_irq(): %d\n", err);
149 gpio_free(output->hpd_gpio);
150 return err;
151 }
152
153 output->hpd_irq = err;
154
155 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
156 IRQF_ONESHOT;
157
158 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
159 flags, "hpd", output);
160 if (err < 0) {
161 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
162 output->hpd_irq, err);
163 gpio_free(output->hpd_gpio);
164 return err;
165 }
166
167 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
168
169 /*
170 * Disable the interrupt until the connector has been
171 * initialized to avoid a race in the hotplug interrupt
172 * handler.
173 */
174 disable_irq(output->hpd_irq);
175 }
176
177 return 0;
178}
179
180void tegra_output_remove(struct tegra_output *output)
181{
182 if (gpio_is_valid(output->hpd_gpio)) {
183 free_irq(output->hpd_irq, output);
184 gpio_free(output->hpd_gpio);
185 }
186
187 if (output->ddc)
188 put_device(&output->ddc->dev);
189}
190
191int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
192{
193 int err;
194
195 if (output->panel) {
196 err = drm_panel_attach(output->panel, &output->connector);
197 if (err < 0)
198 return err;
199 }
200
201 /*
202 * The connector is now registered and ready to receive hotplug events
203 * so the hotplug interrupt can be enabled.
204 */
205 if (gpio_is_valid(output->hpd_gpio))
206 enable_irq(output->hpd_irq);
207
208 return 0;
209}
210
211void tegra_output_exit(struct tegra_output *output)
212{
213 /*
214 * The connector is going away, so the interrupt must be disabled to
215 * prevent the hotplug interrupt handler from potentially crashing.
216 */
217 if (gpio_is_valid(output->hpd_gpio))
218 disable_irq(output->hpd_irq);
219
220 if (output->panel)
221 drm_panel_detach(output->panel);
222}
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_edid.h>
12#include <drm/drm_of.h>
13#include <drm/drm_panel.h>
14#include <drm/drm_simple_kms_helper.h>
15
16#include "drm.h"
17#include "dc.h"
18
19#include <media/cec-notifier.h>
20
21int tegra_output_connector_get_modes(struct drm_connector *connector)
22{
23 struct tegra_output *output = connector_to_output(connector);
24 struct edid *edid = NULL;
25 int err = 0;
26
27 /*
28 * If the panel provides one or more modes, use them exclusively and
29 * ignore any other means of obtaining a mode.
30 */
31 if (output->panel) {
32 err = drm_panel_get_modes(output->panel, connector);
33 if (err > 0)
34 return err;
35 }
36
37 if (output->edid)
38 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
39 else if (output->ddc)
40 edid = drm_get_edid(connector, output->ddc);
41
42 cec_notifier_set_phys_addr_from_edid(output->cec, edid);
43 drm_connector_update_edid_property(connector, edid);
44
45 if (edid) {
46 err = drm_add_edid_modes(connector, edid);
47 kfree(edid);
48 }
49
50 return err;
51}
52
53enum drm_connector_status
54tegra_output_connector_detect(struct drm_connector *connector, bool force)
55{
56 struct tegra_output *output = connector_to_output(connector);
57 enum drm_connector_status status = connector_status_unknown;
58
59 if (output->hpd_gpio) {
60 if (gpiod_get_value(output->hpd_gpio) == 0)
61 status = connector_status_disconnected;
62 else
63 status = connector_status_connected;
64 } else {
65 if (!output->panel)
66 status = connector_status_disconnected;
67 else
68 status = connector_status_connected;
69 }
70
71 if (status != connector_status_connected)
72 cec_notifier_phys_addr_invalidate(output->cec);
73
74 return status;
75}
76
77void tegra_output_connector_destroy(struct drm_connector *connector)
78{
79 struct tegra_output *output = connector_to_output(connector);
80
81 if (output->cec)
82 cec_notifier_conn_unregister(output->cec);
83
84 drm_connector_unregister(connector);
85 drm_connector_cleanup(connector);
86}
87
88static irqreturn_t hpd_irq(int irq, void *data)
89{
90 struct tegra_output *output = data;
91
92 if (output->connector.dev)
93 drm_helper_hpd_irq_event(output->connector.dev);
94
95 return IRQ_HANDLED;
96}
97
98int tegra_output_probe(struct tegra_output *output)
99{
100 struct device_node *ddc, *panel;
101 unsigned long flags;
102 int err, size;
103
104 if (!output->of_node)
105 output->of_node = output->dev->of_node;
106
107 err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
108 &output->panel, &output->bridge);
109 if (err && err != -ENODEV)
110 return err;
111
112 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
113 if (panel) {
114 /*
115 * Don't mix nvidia,panel phandle with the graph in a
116 * device-tree.
117 */
118 WARN_ON(output->panel || output->bridge);
119
120 output->panel = of_drm_find_panel(panel);
121 of_node_put(panel);
122
123 if (IS_ERR(output->panel))
124 return PTR_ERR(output->panel);
125 }
126
127 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
128
129 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
130 if (ddc) {
131 output->ddc = of_get_i2c_adapter_by_node(ddc);
132 of_node_put(ddc);
133
134 if (!output->ddc) {
135 err = -EPROBE_DEFER;
136 return err;
137 }
138 }
139
140 output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
141 of_fwnode_handle(output->of_node),
142 "nvidia,hpd",
143 GPIOD_IN,
144 "HDMI hotplug detect");
145 if (IS_ERR(output->hpd_gpio)) {
146 if (PTR_ERR(output->hpd_gpio) != -ENOENT) {
147 err = PTR_ERR(output->hpd_gpio);
148 goto put_i2c;
149 }
150
151 output->hpd_gpio = NULL;
152 }
153
154 if (output->hpd_gpio) {
155 err = gpiod_to_irq(output->hpd_gpio);
156 if (err < 0) {
157 dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
158 goto put_i2c;
159 }
160
161 output->hpd_irq = err;
162
163 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
164 IRQF_ONESHOT;
165
166 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
167 flags, "hpd", output);
168 if (err < 0) {
169 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
170 output->hpd_irq, err);
171 goto put_i2c;
172 }
173
174 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
175
176 /*
177 * Disable the interrupt until the connector has been
178 * initialized to avoid a race in the hotplug interrupt
179 * handler.
180 */
181 disable_irq(output->hpd_irq);
182 }
183
184 return 0;
185
186put_i2c:
187 if (output->ddc)
188 i2c_put_adapter(output->ddc);
189
190 return err;
191}
192
193void tegra_output_remove(struct tegra_output *output)
194{
195 if (output->hpd_gpio)
196 free_irq(output->hpd_irq, output);
197
198 if (output->ddc)
199 i2c_put_adapter(output->ddc);
200}
201
202int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
203{
204 int connector_type;
205
206 /*
207 * The connector is now registered and ready to receive hotplug events
208 * so the hotplug interrupt can be enabled.
209 */
210 if (output->hpd_gpio)
211 enable_irq(output->hpd_irq);
212
213 connector_type = output->connector.connector_type;
214 /*
215 * Create a CEC notifier for HDMI connector.
216 */
217 if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
218 connector_type == DRM_MODE_CONNECTOR_HDMIB) {
219 struct cec_connector_info conn_info;
220
221 cec_fill_conn_info_from_drm(&conn_info, &output->connector);
222 output->cec = cec_notifier_conn_register(output->dev, NULL,
223 &conn_info);
224 if (!output->cec)
225 return -ENOMEM;
226 }
227
228 return 0;
229}
230
231void tegra_output_exit(struct tegra_output *output)
232{
233 /*
234 * The connector is going away, so the interrupt must be disabled to
235 * prevent the hotplug interrupt handler from potentially crashing.
236 */
237 if (output->hpd_gpio)
238 disable_irq(output->hpd_irq);
239}
240
241void tegra_output_find_possible_crtcs(struct tegra_output *output,
242 struct drm_device *drm)
243{
244 struct device *dev = output->dev;
245 struct drm_crtc *crtc;
246 unsigned int mask = 0;
247
248 drm_for_each_crtc(crtc, drm) {
249 struct tegra_dc *dc = to_tegra_dc(crtc);
250
251 if (tegra_dc_has_output(dc, dev))
252 mask |= drm_crtc_mask(crtc);
253 }
254
255 if (mask == 0) {
256 dev_warn(dev, "missing output definition for heads in DT\n");
257 mask = 0x3;
258 }
259
260 output->encoder.possible_crtcs = mask;
261}
262
263int tegra_output_suspend(struct tegra_output *output)
264{
265 if (output->hpd_irq)
266 disable_irq(output->hpd_irq);
267
268 return 0;
269}
270
271int tegra_output_resume(struct tegra_output *output)
272{
273 if (output->hpd_irq)
274 enable_irq(output->hpd_irq);
275
276 return 0;
277}