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