Linux 4.2.1
[linux/fpc-iii.git] / drivers / gpu / drm / tegra / output.c
blob37db47975d486bfd4ce982e93cdfee59fcfc2a8c
1 /*
2 * Copyright (C) 2012 Avionic Design GmbH
3 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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 */
10 #include <linux/of_gpio.h>
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_panel.h>
14 #include "drm.h"
16 int tegra_output_connector_get_modes(struct drm_connector *connector)
18 struct tegra_output *output = connector_to_output(connector);
19 struct edid *edid = NULL;
20 int err = 0;
23 * If the panel provides one or more modes, use them exclusively and
24 * ignore any other means of obtaining a mode.
26 if (output->panel) {
27 err = output->panel->funcs->get_modes(output->panel);
28 if (err > 0)
29 return err;
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);
37 drm_mode_connector_update_edid_property(connector, edid);
39 if (edid) {
40 err = drm_add_edid_modes(connector, edid);
41 kfree(edid);
44 return err;
47 struct drm_encoder *
48 tegra_output_connector_best_encoder(struct drm_connector *connector)
50 struct tegra_output *output = connector_to_output(connector);
52 return &output->encoder;
55 enum drm_connector_status
56 tegra_output_connector_detect(struct drm_connector *connector, bool force)
58 struct tegra_output *output = connector_to_output(connector);
59 enum drm_connector_status status = connector_status_unknown;
61 if (gpio_is_valid(output->hpd_gpio)) {
62 if (gpio_get_value(output->hpd_gpio) == 0)
63 status = connector_status_disconnected;
64 else
65 status = connector_status_connected;
66 } else {
67 if (!output->panel)
68 status = connector_status_disconnected;
69 else
70 status = connector_status_connected;
73 return status;
76 void tegra_output_connector_destroy(struct drm_connector *connector)
78 drm_connector_unregister(connector);
79 drm_connector_cleanup(connector);
82 void tegra_output_encoder_destroy(struct drm_encoder *encoder)
84 drm_encoder_cleanup(encoder);
87 static irqreturn_t hpd_irq(int irq, void *data)
89 struct tegra_output *output = data;
91 if (output->connector.dev)
92 drm_helper_hpd_irq_event(output->connector.dev);
94 return IRQ_HANDLED;
97 int tegra_output_probe(struct tegra_output *output)
99 struct device_node *ddc, *panel;
100 enum of_gpio_flags flags;
101 int err, size;
103 if (!output->of_node)
104 output->of_node = output->dev->of_node;
106 panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
107 if (panel) {
108 output->panel = of_drm_find_panel(panel);
109 if (!output->panel)
110 return -EPROBE_DEFER;
112 of_node_put(panel);
115 output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
117 ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
118 if (ddc) {
119 output->ddc = of_find_i2c_adapter_by_node(ddc);
120 if (!output->ddc) {
121 err = -EPROBE_DEFER;
122 of_node_put(ddc);
123 return err;
126 of_node_put(ddc);
129 output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
130 "nvidia,hpd-gpio", 0,
131 &flags);
132 if (gpio_is_valid(output->hpd_gpio)) {
133 unsigned long flags;
135 err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
136 "HDMI hotplug detect");
137 if (err < 0) {
138 dev_err(output->dev, "gpio_request_one(): %d\n", err);
139 return err;
142 err = gpio_to_irq(output->hpd_gpio);
143 if (err < 0) {
144 dev_err(output->dev, "gpio_to_irq(): %d\n", err);
145 gpio_free(output->hpd_gpio);
146 return err;
149 output->hpd_irq = err;
151 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
152 IRQF_ONESHOT;
154 err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
155 flags, "hpd", output);
156 if (err < 0) {
157 dev_err(output->dev, "failed to request IRQ#%u: %d\n",
158 output->hpd_irq, err);
159 gpio_free(output->hpd_gpio);
160 return err;
163 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
166 * Disable the interrupt until the connector has been
167 * initialized to avoid a race in the hotplug interrupt
168 * handler.
170 disable_irq(output->hpd_irq);
173 return 0;
176 void tegra_output_remove(struct tegra_output *output)
178 if (gpio_is_valid(output->hpd_gpio)) {
179 free_irq(output->hpd_irq, output);
180 gpio_free(output->hpd_gpio);
183 if (output->ddc)
184 put_device(&output->ddc->dev);
187 int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
189 int err;
191 if (output->panel) {
192 err = drm_panel_attach(output->panel, &output->connector);
193 if (err < 0)
194 return err;
198 * The connector is now registered and ready to receive hotplug events
199 * so the hotplug interrupt can be enabled.
201 if (gpio_is_valid(output->hpd_gpio))
202 enable_irq(output->hpd_irq);
204 return 0;
207 void tegra_output_exit(struct tegra_output *output)
210 * The connector is going away, so the interrupt must be disabled to
211 * prevent the hotplug interrupt handler from potentially crashing.
213 if (gpio_is_valid(output->hpd_gpio))
214 disable_irq(output->hpd_irq);
216 if (output->panel)
217 drm_panel_detach(output->panel);