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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
10#include "drm.h"
11#include "dc.h"
12
13#include <media/cec-notifier.h>
14
15int tegra_output_connector_get_modes(struct drm_connector *connector)
16{
17 struct tegra_output *output = connector_to_output(connector);
18 struct edid *edid = NULL;
19 int err = 0;
20
21 /*
22 * If the panel provides one or more modes, use them exclusively and
23 * ignore any other means of obtaining a mode.
24 */
25 if (output->panel) {
26 err = output->panel->funcs->get_modes(output->panel);
27 if (err > 0)
28 return err;
29 }
30
31 if (output->edid)
32 edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
33 else if (output->ddc)
34 edid = drm_get_edid(connector, output->ddc);
35
36 cec_notifier_set_phys_addr_from_edid(output->cec, edid);
37 drm_connector_update_edid_property(connector, edid);
38
39 if (edid) {
40 err = drm_add_edid_modes(connector, edid);
41 kfree(edid);
42 }
43
44 return err;
45}
46
47enum drm_connector_status
48tegra_output_connector_detect(struct drm_connector *connector, bool force)
49{
50 struct tegra_output *output = connector_to_output(connector);
51 enum drm_connector_status status = connector_status_unknown;
52
53 if (output->hpd_gpio) {
54 if (gpiod_get_value(output->hpd_gpio) == 0)
55 status = connector_status_disconnected;
56 else
57 status = connector_status_connected;
58 } else {
59 if (!output->panel)
60 status = connector_status_disconnected;
61 else
62 status = connector_status_connected;
63 }
64
65 if (status != connector_status_connected)
66 cec_notifier_phys_addr_invalidate(output->cec);
67
68 return status;
69}
70
71void tegra_output_connector_destroy(struct drm_connector *connector)
72{
73 drm_connector_unregister(connector);
74 drm_connector_cleanup(connector);
75}
76
77void tegra_output_encoder_destroy(struct drm_encoder *encoder)
78{
79 drm_encoder_cleanup(encoder);
80}
81
82static irqreturn_t hpd_irq(int irq, void *data)
83{
84 struct tegra_output *output = data;
85
86 if (output->connector.dev)
87 drm_helper_hpd_irq_event(output->connector.dev);
88
89 return IRQ_HANDLED;
90}
91
92int tegra_output_probe(struct tegra_output *output)
93{
94 struct device_node *ddc, *panel;
95 unsigned long flags;
96 int err, size;
97
98 if (!output->of_node)
99 output->of_node = output->dev->of_node;
100
101 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
102 if (panel) {
103 output->panel = of_drm_find_panel(panel);
104 if (IS_ERR(output->panel))
105 return PTR_ERR(output->panel);
106
107 of_node_put(panel);
108 }
109
110 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
111
112 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
113 if (ddc) {
114 output->ddc = of_find_i2c_adapter_by_node(ddc);
115 if (!output->ddc) {
116 err = -EPROBE_DEFER;
117 of_node_put(ddc);
118 return err;
119 }
120
121 of_node_put(ddc);
122 }
123
124 output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
125 output->of_node,
126 "nvidia,hpd-gpio", 0,
127 GPIOD_IN,
128 "HDMI hotplug detect");
129 if (IS_ERR(output->hpd_gpio)) {
130 if (PTR_ERR(output->hpd_gpio) != -ENOENT)
131 return PTR_ERR(output->hpd_gpio);
132
133 output->hpd_gpio = NULL;
134 }
135
136 if (output->hpd_gpio) {
137 err = gpiod_to_irq(output->hpd_gpio);
138 if (err < 0) {
139 dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
140 return err;
141 }
142
143 output->hpd_irq = err;
144
145 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
146 IRQF_ONESHOT;
147
148 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
149 flags, "hpd", output);
150 if (err < 0) {
151 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
152 output->hpd_irq, err);
153 return err;
154 }
155
156 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
157
158 /*
159 * Disable the interrupt until the connector has been
160 * initialized to avoid a race in the hotplug interrupt
161 * handler.
162 */
163 disable_irq(output->hpd_irq);
164 }
165
166 output->cec = cec_notifier_get(output->dev);
167 if (!output->cec)
168 return -ENOMEM;
169
170 return 0;
171}
172
173void tegra_output_remove(struct tegra_output *output)
174{
175 if (output->cec)
176 cec_notifier_put(output->cec);
177
178 if (output->hpd_gpio)
179 free_irq(output->hpd_irq, output);
180
181 if (output->ddc)
182 put_device(&output->ddc->dev);
183}
184
185int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
186{
187 int err;
188
189 if (output->panel) {
190 err = drm_panel_attach(output->panel, &output->connector);
191 if (err < 0)
192 return err;
193 }
194
195 /*
196 * The connector is now registered and ready to receive hotplug events
197 * so the hotplug interrupt can be enabled.
198 */
199 if (output->hpd_gpio)
200 enable_irq(output->hpd_irq);
201
202 return 0;
203}
204
205void tegra_output_exit(struct tegra_output *output)
206{
207 /*
208 * The connector is going away, so the interrupt must be disabled to
209 * prevent the hotplug interrupt handler from potentially crashing.
210 */
211 if (output->hpd_gpio)
212 disable_irq(output->hpd_irq);
213
214 if (output->panel)
215 drm_panel_detach(output->panel);
216}
217
218void tegra_output_find_possible_crtcs(struct tegra_output *output,
219 struct drm_device *drm)
220{
221 struct device *dev = output->dev;
222 struct drm_crtc *crtc;
223 unsigned int mask = 0;
224
225 drm_for_each_crtc(crtc, drm) {
226 struct tegra_dc *dc = to_tegra_dc(crtc);
227
228 if (tegra_dc_has_output(dc, dev))
229 mask |= drm_crtc_mask(crtc);
230 }
231
232 if (mask == 0) {
233 dev_warn(dev, "missing output definition for heads in DT\n");
234 mask = 0x3;
235 }
236
237 output->encoder.possible_crtcs = mask;
238}