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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 <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}