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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
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}