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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 <drm/drm_atomic_helper.h>
8#include <drm/drm_panel.h>
9#include <drm/drm_simple_kms_helper.h>
10
11#include "drm.h"
12#include "dc.h"
13
14#include <media/cec-notifier.h>
15
16int tegra_output_connector_get_modes(struct drm_connector *connector)
17{
18 struct tegra_output *output = connector_to_output(connector);
19 struct edid *edid = NULL;
20 int err = 0;
21
22 /*
23 * If the panel provides one or more modes, use them exclusively and
24 * ignore any other means of obtaining a mode.
25 */
26 if (output->panel) {
27 err = drm_panel_get_modes(output->panel, connector);
28 if (err > 0)
29 return err;
30 }
31
32 if (output->edid)
33 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
34 else if (output->ddc)
35 edid = drm_get_edid(connector, output->ddc);
36
37 cec_notifier_set_phys_addr_from_edid(output->cec, edid);
38 drm_connector_update_edid_property(connector, edid);
39
40 if (edid) {
41 err = drm_add_edid_modes(connector, edid);
42 kfree(edid);
43 }
44
45 return err;
46}
47
48enum drm_connector_status
49tegra_output_connector_detect(struct drm_connector *connector, bool force)
50{
51 struct tegra_output *output = connector_to_output(connector);
52 enum drm_connector_status status = connector_status_unknown;
53
54 if (output->hpd_gpio) {
55 if (gpiod_get_value(output->hpd_gpio) == 0)
56 status = connector_status_disconnected;
57 else
58 status = connector_status_connected;
59 } else {
60 if (!output->panel)
61 status = connector_status_disconnected;
62 else
63 status = connector_status_connected;
64 }
65
66 if (status != connector_status_connected)
67 cec_notifier_phys_addr_invalidate(output->cec);
68
69 return status;
70}
71
72void tegra_output_connector_destroy(struct drm_connector *connector)
73{
74 struct tegra_output *output = connector_to_output(connector);
75
76 if (output->cec)
77 cec_notifier_conn_unregister(output->cec);
78
79 drm_connector_unregister(connector);
80 drm_connector_cleanup(connector);
81}
82
83static irqreturn_t hpd_irq(int irq, void *data)
84{
85 struct tegra_output *output = data;
86
87 if (output->connector.dev)
88 drm_helper_hpd_irq_event(output->connector.dev);
89
90 return IRQ_HANDLED;
91}
92
93int tegra_output_probe(struct tegra_output *output)
94{
95 struct device_node *ddc, *panel;
96 unsigned long flags;
97 int err, size;
98
99 if (!output->of_node)
100 output->of_node = output->dev->of_node;
101
102 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
103 if (panel) {
104 output->panel = of_drm_find_panel(panel);
105 if (IS_ERR(output->panel))
106 return PTR_ERR(output->panel);
107
108 of_node_put(panel);
109 }
110
111 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
112
113 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
114 if (ddc) {
115 output->ddc = of_find_i2c_adapter_by_node(ddc);
116 if (!output->ddc) {
117 err = -EPROBE_DEFER;
118 of_node_put(ddc);
119 return err;
120 }
121
122 of_node_put(ddc);
123 }
124
125 output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
126 output->of_node,
127 "nvidia,hpd-gpio", 0,
128 GPIOD_IN,
129 "HDMI hotplug detect");
130 if (IS_ERR(output->hpd_gpio)) {
131 if (PTR_ERR(output->hpd_gpio) != -ENOENT)
132 return PTR_ERR(output->hpd_gpio);
133
134 output->hpd_gpio = NULL;
135 }
136
137 if (output->hpd_gpio) {
138 err = gpiod_to_irq(output->hpd_gpio);
139 if (err < 0) {
140 dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
141 return err;
142 }
143
144 output->hpd_irq = err;
145
146 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
147 IRQF_ONESHOT;
148
149 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
150 flags, "hpd", output);
151 if (err < 0) {
152 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
153 output->hpd_irq, err);
154 return err;
155 }
156
157 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
158
159 /*
160 * Disable the interrupt until the connector has been
161 * initialized to avoid a race in the hotplug interrupt
162 * handler.
163 */
164 disable_irq(output->hpd_irq);
165 }
166
167 return 0;
168}
169
170void tegra_output_remove(struct tegra_output *output)
171{
172 if (output->hpd_gpio)
173 free_irq(output->hpd_irq, output);
174
175 if (output->ddc)
176 put_device(&output->ddc->dev);
177}
178
179int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
180{
181 int connector_type;
182 int err;
183
184 if (output->panel) {
185 err = drm_panel_attach(output->panel, &output->connector);
186 if (err < 0)
187 return err;
188 }
189
190 /*
191 * The connector is now registered and ready to receive hotplug events
192 * so the hotplug interrupt can be enabled.
193 */
194 if (output->hpd_gpio)
195 enable_irq(output->hpd_irq);
196
197 connector_type = output->connector.connector_type;
198 /*
199 * Create a CEC notifier for HDMI connector.
200 */
201 if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
202 connector_type == DRM_MODE_CONNECTOR_HDMIB) {
203 struct cec_connector_info conn_info;
204
205 cec_fill_conn_info_from_drm(&conn_info, &output->connector);
206 output->cec = cec_notifier_conn_register(output->dev, NULL,
207 &conn_info);
208 if (!output->cec)
209 return -ENOMEM;
210 }
211
212 return 0;
213}
214
215void 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 (output->hpd_gpio)
222 disable_irq(output->hpd_irq);
223
224 if (output->panel)
225 drm_panel_detach(output->panel);
226}
227
228void 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
250int tegra_output_suspend(struct tegra_output *output)
251{
252 if (output->hpd_irq)
253 disable_irq(output->hpd_irq);
254
255 return 0;
256}
257
258int tegra_output_resume(struct tegra_output *output)
259{
260 if (output->hpd_irq)
261 enable_irq(output->hpd_irq);
262
263 return 0;
264}