tegra_drm_subr.c revision 332010 
1/*-
2 * Copyright (c) 2015 Michal Meloun
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/arm/nvidia/drm2/tegra_drm_subr.c 310600 2016-12-26 14:36:05Z mmel $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35
36#include <machine/bus.h>
37
38#include <dev/extres/clk/clk.h>
39#include <dev/drm2/drmP.h>
40#include <dev/drm2/drm_crtc.h>
41#include <dev/drm2/drm_crtc_helper.h>
42#include <dev/drm2/drm_edid.h>
43#include <dev/drm2/drm_fb_helper.h>
44#include <dev/gpio/gpiobusvar.h>
45#include <dev/ofw/ofw_bus_subr.h>
46
47#include <arm/nvidia/drm2/tegra_drm.h>
48
49#include <gnu/dts/include/dt-bindings/gpio/gpio.h>
50
51int
52tegra_drm_connector_get_modes(struct drm_connector *connector)
53{
54	struct tegra_drm_encoder *output;
55	struct edid *edid = NULL;
56	int rv;
57
58	output = container_of(connector, struct tegra_drm_encoder,
59	     connector);
60
61	/* Panel is first */
62	if (output->panel != NULL) {
63		/* XXX panel parsing */
64		return (0);
65	}
66
67	/* static EDID is second*/
68	edid = output->edid;
69
70	/* EDID from monitor is last */
71	if (edid == NULL)
72		edid = drm_get_edid(connector, output->ddc);
73
74	if (edid == NULL)
75		return (0);
76
77	/* Process EDID */
78	drm_mode_connector_update_edid_property(connector, edid);
79	rv = drm_add_edid_modes(connector, edid);
80	drm_edid_to_eld(connector, edid);
81	return (rv);
82}
83
84struct drm_encoder *
85tegra_drm_connector_best_encoder(struct drm_connector *connector)
86{
87	struct tegra_drm_encoder *output;
88
89	output = container_of(connector, struct tegra_drm_encoder,
90	     connector);
91
92	return &(output->encoder);
93}
94
95enum drm_connector_status
96tegra_drm_connector_detect(struct drm_connector *connector, bool force)
97{
98	struct tegra_drm_encoder *output;
99	bool active;
100	int rv;
101
102	output = container_of(connector, struct tegra_drm_encoder,
103	     connector);
104	if (output->gpio_hpd == NULL) {
105		return ((output->panel != NULL) ?
106		    connector_status_connected:
107		    connector_status_disconnected);
108	}
109
110	rv = gpio_pin_is_active(output->gpio_hpd, &active);
111	if (rv  != 0) {
112		device_printf(output->dev, " GPIO read failed: %d\n", rv);
113		return (connector_status_unknown);
114	}
115
116	return (active ?
117	    connector_status_connected : connector_status_disconnected);
118}
119
120int
121tegra_drm_encoder_attach(struct tegra_drm_encoder *output, phandle_t node)
122{
123	int rv;
124	phandle_t ddc;
125
126	/* XXX parse output panel here */
127
128	rv = OF_getencprop_alloc(node, "nvidia,edid", 1,
129	    (void **)&output->edid);
130
131	/* EDID exist but have invalid size */
132	if ((rv >= 0) && (rv != sizeof(struct edid))) {
133		device_printf(output->dev,
134		    "Malformed \"nvidia,edid\" property\n");
135		if (output->edid != NULL)
136			free(output->edid, M_OFWPROP);
137		return (ENXIO);
138	}
139
140	gpio_pin_get_by_ofw_property(output->dev, node, "nvidia,hpd-gpio",
141	    &output->gpio_hpd);
142	ddc = 0;
143	OF_getencprop(node, "nvidia,ddc-i2c-bus", &ddc, sizeof(ddc));
144	if (ddc > 0)
145		output->ddc = OF_device_from_xref(ddc);
146	if ((output->edid == NULL) && (output->ddc == NULL))
147		return (ENXIO);
148
149	if (output->gpio_hpd != NULL) {
150		output->connector.polled =
151//		    DRM_CONNECTOR_POLL_HPD;
152		    DRM_CONNECTOR_POLL_DISCONNECT |
153		    DRM_CONNECTOR_POLL_CONNECT;
154	}
155
156	return (0);
157}
158
159int tegra_drm_encoder_init(struct tegra_drm_encoder *output,
160    struct tegra_drm *drm)
161{
162
163	if (output->panel) {
164		/* attach panel */
165	}
166	return (0);
167}
168
169int tegra_drm_encoder_exit(struct tegra_drm_encoder *output,
170    struct tegra_drm *drm)
171{
172
173	if (output->panel) {
174		/* detach panel */
175	}
176	return (0);
177}