1 /*
2 * R-Car Display Unit HDMI Encoder
3 *
4 * Copyright (C) 2014 Renesas Electronics Corporation
5 *
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/slab.h>
15
16 #include <drm/drmP.h>
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_encoder_slave.h>
20
21 #include "rcar_du_drv.h"
22 #include "rcar_du_encoder.h"
23 #include "rcar_du_hdmienc.h"
24 #include "rcar_du_lvdsenc.h"
25
26 struct rcar_du_hdmienc {
27 struct rcar_du_encoder *renc;
28 struct device *dev;
29 bool enabled;
30 };
31
32 #define to_rcar_hdmienc(e) (to_rcar_encoder(e)->hdmi)
33 #define to_slave_funcs(e) (to_rcar_encoder(e)->slave.slave_funcs)
34
rcar_du_hdmienc_disable(struct drm_encoder * encoder)35 static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
36 {
37 struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
38 struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
39
40 if (sfuncs->dpms)
41 sfuncs->dpms(encoder, DRM_MODE_DPMS_OFF);
42
43 if (hdmienc->renc->lvds)
44 rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
45 false);
46
47 hdmienc->enabled = false;
48 }
49
rcar_du_hdmienc_enable(struct drm_encoder * encoder)50 static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
51 {
52 struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
53 struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
54
55 if (hdmienc->renc->lvds)
56 rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
57 true);
58
59 if (sfuncs->dpms)
60 sfuncs->dpms(encoder, DRM_MODE_DPMS_ON);
61
62 hdmienc->enabled = true;
63 }
64
rcar_du_hdmienc_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)65 static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
66 struct drm_crtc_state *crtc_state,
67 struct drm_connector_state *conn_state)
68 {
69 struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
70 struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
71 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
72 const struct drm_display_mode *mode = &crtc_state->mode;
73
74 /* The internal LVDS encoder has a clock frequency operating range of
75 * 30MHz to 150MHz. Clamp the clock accordingly.
76 */
77 if (hdmienc->renc->lvds)
78 adjusted_mode->clock = clamp(adjusted_mode->clock,
79 30000, 150000);
80
81 if (sfuncs->mode_fixup == NULL)
82 return 0;
83
84 return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
85 }
86
rcar_du_hdmienc_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)87 static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
88 struct drm_display_mode *mode,
89 struct drm_display_mode *adjusted_mode)
90 {
91 struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
92 struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
93
94 if (sfuncs->mode_set)
95 sfuncs->mode_set(encoder, mode, adjusted_mode);
96
97 rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
98 }
99
100 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
101 .mode_set = rcar_du_hdmienc_mode_set,
102 .disable = rcar_du_hdmienc_disable,
103 .enable = rcar_du_hdmienc_enable,
104 .atomic_check = rcar_du_hdmienc_atomic_check,
105 };
106
rcar_du_hdmienc_cleanup(struct drm_encoder * encoder)107 static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
108 {
109 struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
110
111 if (hdmienc->enabled)
112 rcar_du_hdmienc_disable(encoder);
113
114 drm_encoder_cleanup(encoder);
115 put_device(hdmienc->dev);
116 }
117
118 static const struct drm_encoder_funcs encoder_funcs = {
119 .destroy = rcar_du_hdmienc_cleanup,
120 };
121
rcar_du_hdmienc_init(struct rcar_du_device * rcdu,struct rcar_du_encoder * renc,struct device_node * np)122 int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
123 struct rcar_du_encoder *renc, struct device_node *np)
124 {
125 struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
126 struct drm_i2c_encoder_driver *driver;
127 struct i2c_client *i2c_slave;
128 struct rcar_du_hdmienc *hdmienc;
129 int ret;
130
131 hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
132 if (hdmienc == NULL)
133 return -ENOMEM;
134
135 /* Locate the slave I2C device and driver. */
136 i2c_slave = of_find_i2c_device_by_node(np);
137 if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
138 return -EPROBE_DEFER;
139
140 hdmienc->dev = &i2c_slave->dev;
141
142 if (hdmienc->dev->driver == NULL) {
143 ret = -EPROBE_DEFER;
144 goto error;
145 }
146
147 /* Initialize the slave encoder. */
148 driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
149 ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
150 if (ret < 0)
151 goto error;
152
153 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
154 DRM_MODE_ENCODER_TMDS);
155 if (ret < 0)
156 goto error;
157
158 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
159
160 renc->hdmi = hdmienc;
161 hdmienc->renc = renc;
162
163 return 0;
164
165 error:
166 put_device(hdmienc->dev);
167 return ret;
168 }
169