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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 const struct drm_edid *drm_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->drm_edid)
38 drm_edid = drm_edid_dup(output->drm_edid);
39 else if (output->ddc)
40 drm_edid = drm_edid_read_ddc(connector, output->ddc);
41
42 drm_edid_connector_update(connector, drm_edid);
43 cec_notifier_set_phys_addr(output->cec,
44 connector->display_info.source_physical_address);
45
46 err = drm_edid_connector_add_modes(connector);
47 drm_edid_free(drm_edid);
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 const void *edid;
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 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
128 if (ddc) {
129 output->ddc = of_get_i2c_adapter_by_node(ddc);
130 of_node_put(ddc);
131
132 if (!output->ddc) {
133 err = -EPROBE_DEFER;
134 return err;
135 }
136 }
137
138 edid = of_get_property(output->of_node, "nvidia,edid", &size);
139 output->drm_edid = drm_edid_alloc(edid, size);
140
141 output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
142 of_fwnode_handle(output->of_node),
143 "nvidia,hpd",
144 GPIOD_IN,
145 "HDMI hotplug detect");
146 if (IS_ERR(output->hpd_gpio)) {
147 if (PTR_ERR(output->hpd_gpio) != -ENOENT) {
148 err = PTR_ERR(output->hpd_gpio);
149 goto put_i2c;
150 }
151
152 output->hpd_gpio = NULL;
153 }
154
155 if (output->hpd_gpio) {
156 err = gpiod_to_irq(output->hpd_gpio);
157 if (err < 0) {
158 dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
159 goto put_i2c;
160 }
161
162 output->hpd_irq = err;
163
164 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
165 IRQF_ONESHOT;
166
167 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
168 flags, "hpd", output);
169 if (err < 0) {
170 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
171 output->hpd_irq, err);
172 goto put_i2c;
173 }
174
175 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
176
177 /*
178 * Disable the interrupt until the connector has been
179 * initialized to avoid a race in the hotplug interrupt
180 * handler.
181 */
182 disable_irq(output->hpd_irq);
183 }
184
185 return 0;
186
187put_i2c:
188 if (output->ddc)
189 i2c_put_adapter(output->ddc);
190
191 drm_edid_free(output->drm_edid);
192
193 return err;
194}
195
196void tegra_output_remove(struct tegra_output *output)
197{
198 if (output->hpd_gpio)
199 free_irq(output->hpd_irq, output);
200
201 if (output->ddc)
202 i2c_put_adapter(output->ddc);
203
204 drm_edid_free(output->drm_edid);
205}
206
207int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
208{
209 int connector_type;
210
211 /*
212 * The connector is now registered and ready to receive hotplug events
213 * so the hotplug interrupt can be enabled.
214 */
215 if (output->hpd_gpio)
216 enable_irq(output->hpd_irq);
217
218 connector_type = output->connector.connector_type;
219 /*
220 * Create a CEC notifier for HDMI connector.
221 */
222 if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
223 connector_type == DRM_MODE_CONNECTOR_HDMIB) {
224 struct cec_connector_info conn_info;
225
226 cec_fill_conn_info_from_drm(&conn_info, &output->connector);
227 output->cec = cec_notifier_conn_register(output->dev, NULL,
228 &conn_info);
229 if (!output->cec)
230 return -ENOMEM;
231 }
232
233 return 0;
234}
235
236void tegra_output_exit(struct tegra_output *output)
237{
238 /*
239 * The connector is going away, so the interrupt must be disabled to
240 * prevent the hotplug interrupt handler from potentially crashing.
241 */
242 if (output->hpd_gpio)
243 disable_irq(output->hpd_irq);
244}
245
246void tegra_output_find_possible_crtcs(struct tegra_output *output,
247 struct drm_device *drm)
248{
249 struct device *dev = output->dev;
250 struct drm_crtc *crtc;
251 unsigned int mask = 0;
252
253 drm_for_each_crtc(crtc, drm) {
254 struct tegra_dc *dc = to_tegra_dc(crtc);
255
256 if (tegra_dc_has_output(dc, dev))
257 mask |= drm_crtc_mask(crtc);
258 }
259
260 if (mask == 0) {
261 dev_warn(dev, "missing output definition for heads in DT\n");
262 mask = 0x3;
263 }
264
265 output->encoder.possible_crtcs = mask;
266}
267
268int tegra_output_suspend(struct tegra_output *output)
269{
270 if (output->hpd_irq)
271 disable_irq(output->hpd_irq);
272
273 return 0;
274}
275
276int tegra_output_resume(struct tegra_output *output)
277{
278 if (output->hpd_irq)
279 enable_irq(output->hpd_irq);
280
281 return 0;
282}
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}