Loading...
1/*
2 * rcar_du_encoder.c -- R-Car Display Unit Encoder
3 *
4 * Copyright (C) 2013-2014 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/export.h>
15
16#include <drm/drmP.h>
17#include <drm/drm_crtc.h>
18#include <drm/drm_crtc_helper.h>
19
20#include "rcar_du_drv.h"
21#include "rcar_du_encoder.h"
22#include "rcar_du_hdmicon.h"
23#include "rcar_du_hdmienc.h"
24#include "rcar_du_kms.h"
25#include "rcar_du_lvdscon.h"
26#include "rcar_du_lvdsenc.h"
27#include "rcar_du_vgacon.h"
28
29/* -----------------------------------------------------------------------------
30 * Common connector functions
31 */
32
33struct drm_encoder *
34rcar_du_connector_best_encoder(struct drm_connector *connector)
35{
36 struct rcar_du_connector *rcon = to_rcar_connector(connector);
37
38 return rcar_encoder_to_drm_encoder(rcon->encoder);
39}
40
41/* -----------------------------------------------------------------------------
42 * Encoder
43 */
44
45static void rcar_du_encoder_disable(struct drm_encoder *encoder)
46{
47 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
48
49 if (renc->lvds)
50 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
51}
52
53static void rcar_du_encoder_enable(struct drm_encoder *encoder)
54{
55 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
56
57 if (renc->lvds)
58 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
59}
60
61static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
62 struct drm_crtc_state *crtc_state,
63 struct drm_connector_state *conn_state)
64{
65 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
66 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
67 const struct drm_display_mode *mode = &crtc_state->mode;
68 const struct drm_display_mode *panel_mode;
69 struct drm_connector *connector = conn_state->connector;
70 struct drm_device *dev = encoder->dev;
71
72 /* DAC encoders have currently no restriction on the mode. */
73 if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
74 return 0;
75
76 if (list_empty(&connector->modes)) {
77 dev_dbg(dev->dev, "encoder: empty modes list\n");
78 return -EINVAL;
79 }
80
81 panel_mode = list_first_entry(&connector->modes,
82 struct drm_display_mode, head);
83
84 /* We're not allowed to modify the resolution. */
85 if (mode->hdisplay != panel_mode->hdisplay ||
86 mode->vdisplay != panel_mode->vdisplay)
87 return -EINVAL;
88
89 /* The flat panel mode is fixed, just copy it to the adjusted mode. */
90 drm_mode_copy(adjusted_mode, panel_mode);
91
92 if (renc->lvds)
93 rcar_du_lvdsenc_atomic_check(renc->lvds, adjusted_mode);
94
95 return 0;
96}
97
98static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
99 struct drm_display_mode *mode,
100 struct drm_display_mode *adjusted_mode)
101{
102 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
103
104 rcar_du_crtc_route_output(encoder->crtc, renc->output);
105}
106
107static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
108 .mode_set = rcar_du_encoder_mode_set,
109 .disable = rcar_du_encoder_disable,
110 .enable = rcar_du_encoder_enable,
111 .atomic_check = rcar_du_encoder_atomic_check,
112};
113
114static const struct drm_encoder_funcs encoder_funcs = {
115 .destroy = drm_encoder_cleanup,
116};
117
118int rcar_du_encoder_init(struct rcar_du_device *rcdu,
119 enum rcar_du_encoder_type type,
120 enum rcar_du_output output,
121 struct device_node *enc_node,
122 struct device_node *con_node)
123{
124 struct rcar_du_encoder *renc;
125 struct drm_encoder *encoder;
126 unsigned int encoder_type;
127 int ret;
128
129 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
130 if (renc == NULL)
131 return -ENOMEM;
132
133 renc->output = output;
134 encoder = rcar_encoder_to_drm_encoder(renc);
135
136 switch (output) {
137 case RCAR_DU_OUTPUT_LVDS0:
138 renc->lvds = rcdu->lvds[0];
139 break;
140
141 case RCAR_DU_OUTPUT_LVDS1:
142 renc->lvds = rcdu->lvds[1];
143 break;
144
145 default:
146 break;
147 }
148
149 switch (type) {
150 case RCAR_DU_ENCODER_VGA:
151 encoder_type = DRM_MODE_ENCODER_DAC;
152 break;
153 case RCAR_DU_ENCODER_LVDS:
154 encoder_type = DRM_MODE_ENCODER_LVDS;
155 break;
156 case RCAR_DU_ENCODER_HDMI:
157 encoder_type = DRM_MODE_ENCODER_TMDS;
158 break;
159 case RCAR_DU_ENCODER_NONE:
160 default:
161 /* No external encoder, use the internal encoder type. */
162 encoder_type = rcdu->info->routes[output].encoder_type;
163 break;
164 }
165
166 if (type == RCAR_DU_ENCODER_HDMI) {
167 ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
168 if (ret < 0)
169 goto done;
170 } else {
171 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
172 encoder_type, NULL);
173 if (ret < 0)
174 goto done;
175
176 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
177 }
178
179 switch (encoder_type) {
180 case DRM_MODE_ENCODER_LVDS:
181 ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
182 break;
183
184 case DRM_MODE_ENCODER_DAC:
185 ret = rcar_du_vga_connector_init(rcdu, renc);
186 break;
187
188 case DRM_MODE_ENCODER_TMDS:
189 ret = rcar_du_hdmi_connector_init(rcdu, renc);
190 break;
191
192 default:
193 ret = -EINVAL;
194 break;
195 }
196
197done:
198 if (ret < 0) {
199 if (encoder->name)
200 encoder->funcs->destroy(encoder);
201 devm_kfree(rcdu->dev, renc);
202 }
203
204 return ret;
205}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * rcar_du_encoder.c -- R-Car Display Unit Encoder
4 *
5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
6 *
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10#include <linux/export.h>
11
12#include <drm/drm_bridge.h>
13#include <drm/drm_crtc.h>
14#include <drm/drm_modeset_helper_vtables.h>
15#include <drm/drm_panel.h>
16#include <drm/drm_simple_kms_helper.h>
17
18#include "rcar_du_drv.h"
19#include "rcar_du_encoder.h"
20#include "rcar_du_kms.h"
21#include "rcar_lvds.h"
22
23/* -----------------------------------------------------------------------------
24 * Encoder
25 */
26
27static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
28{
29 struct device_node *ports;
30 struct device_node *port;
31 unsigned int num_ports = 0;
32
33 ports = of_get_child_by_name(node, "ports");
34 if (!ports)
35 ports = of_node_get(node);
36
37 for_each_child_of_node(ports, port) {
38 if (of_node_name_eq(port, "port"))
39 num_ports++;
40 }
41
42 of_node_put(ports);
43
44 return num_ports;
45}
46
47int rcar_du_encoder_init(struct rcar_du_device *rcdu,
48 enum rcar_du_output output,
49 struct device_node *enc_node)
50{
51 struct rcar_du_encoder *renc;
52 struct drm_encoder *encoder;
53 struct drm_bridge *bridge;
54 int ret;
55
56 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
57 if (renc == NULL)
58 return -ENOMEM;
59
60 rcdu->encoders[output] = renc;
61 renc->output = output;
62 encoder = rcar_encoder_to_drm_encoder(renc);
63
64 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
65 enc_node, output);
66
67 /*
68 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
69 * DT node has a single port, assume that it describes a panel and
70 * create a panel bridge.
71 */
72 if ((output == RCAR_DU_OUTPUT_DPAD0 ||
73 output == RCAR_DU_OUTPUT_DPAD1) &&
74 rcar_du_encoder_count_ports(enc_node) == 1) {
75 struct drm_panel *panel = of_drm_find_panel(enc_node);
76
77 if (IS_ERR(panel)) {
78 ret = PTR_ERR(panel);
79 goto done;
80 }
81
82 bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
83 DRM_MODE_CONNECTOR_DPI);
84 if (IS_ERR(bridge)) {
85 ret = PTR_ERR(bridge);
86 goto done;
87 }
88 } else {
89 bridge = of_drm_find_bridge(enc_node);
90 if (!bridge) {
91 ret = -EPROBE_DEFER;
92 goto done;
93 }
94 }
95
96 /*
97 * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
98 * companion for LVDS0 in dual-link mode.
99 */
100 if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
101 if (rcar_lvds_dual_link(bridge)) {
102 ret = -ENOLINK;
103 goto done;
104 }
105 }
106
107 ret = drm_simple_encoder_init(rcdu->ddev, encoder,
108 DRM_MODE_ENCODER_NONE);
109 if (ret < 0)
110 goto done;
111
112 /*
113 * Attach the bridge to the encoder. The bridge will create the
114 * connector.
115 */
116 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
117 if (ret) {
118 drm_encoder_cleanup(encoder);
119 return ret;
120 }
121
122done:
123 if (ret < 0) {
124 if (encoder->name)
125 encoder->funcs->destroy(encoder);
126 devm_kfree(rcdu->dev, renc);
127 }
128
129 return ret;
130}