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 #include <drm/drm_panel.h>
20
21 #include "rcar_du_drv.h"
22 #include "rcar_du_encoder.h"
23 #include "rcar_du_kms.h"
24 #include "rcar_du_lvdscon.h"
25 #include "rcar_du_lvdsenc.h"
26
27 /* -----------------------------------------------------------------------------
28 * Encoder
29 */
30
rcar_du_encoder_disable(struct drm_encoder * encoder)31 static void rcar_du_encoder_disable(struct drm_encoder *encoder)
32 {
33 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
34
35 if (renc->connector && renc->connector->panel) {
36 drm_panel_disable(renc->connector->panel);
37 drm_panel_unprepare(renc->connector->panel);
38 }
39
40 if (renc->lvds)
41 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
42 }
43
rcar_du_encoder_enable(struct drm_encoder * encoder)44 static void rcar_du_encoder_enable(struct drm_encoder *encoder)
45 {
46 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
47
48 if (renc->lvds)
49 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
50
51 if (renc->connector && renc->connector->panel) {
52 drm_panel_prepare(renc->connector->panel);
53 drm_panel_enable(renc->connector->panel);
54 }
55 }
56
rcar_du_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)57 static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
58 struct drm_crtc_state *crtc_state,
59 struct drm_connector_state *conn_state)
60 {
61 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
62 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
63 const struct drm_display_mode *mode = &crtc_state->mode;
64 struct drm_connector *connector = conn_state->connector;
65 struct drm_device *dev = encoder->dev;
66
67 /*
68 * Only panel-related encoder types require validation here, everything
69 * else is handled by the bridge drivers.
70 */
71 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
72 const struct drm_display_mode *panel_mode;
73
74 if (list_empty(&connector->modes)) {
75 dev_dbg(dev->dev, "encoder: empty modes list\n");
76 return -EINVAL;
77 }
78
79 panel_mode = list_first_entry(&connector->modes,
80 struct drm_display_mode, head);
81
82 /* We're not allowed to modify the resolution. */
83 if (mode->hdisplay != panel_mode->hdisplay ||
84 mode->vdisplay != panel_mode->vdisplay)
85 return -EINVAL;
86
87 /*
88 * The flat panel mode is fixed, just copy it to the adjusted
89 * mode.
90 */
91 drm_mode_copy(adjusted_mode, panel_mode);
92 }
93
94 if (renc->lvds)
95 rcar_du_lvdsenc_atomic_check(renc->lvds, adjusted_mode);
96
97 return 0;
98 }
99
rcar_du_encoder_mode_set(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)100 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
101 struct drm_crtc_state *crtc_state,
102 struct drm_connector_state *conn_state)
103 {
104 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
105 struct drm_display_info *info = &conn_state->connector->display_info;
106 enum rcar_lvds_mode mode;
107
108 rcar_du_crtc_route_output(crtc_state->crtc, renc->output);
109
110 if (!renc->lvds) {
111 /*
112 * The DU driver creates connectors only for the outputs of the
113 * internal LVDS encoders.
114 */
115 renc->connector = NULL;
116 return;
117 }
118
119 renc->connector = to_rcar_connector(conn_state->connector);
120
121 if (!info->num_bus_formats || !info->bus_formats) {
122 dev_err(encoder->dev->dev, "no LVDS bus format reported\n");
123 return;
124 }
125
126 switch (info->bus_formats[0]) {
127 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
128 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
129 mode = RCAR_LVDS_MODE_JEIDA;
130 break;
131 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
132 mode = RCAR_LVDS_MODE_VESA;
133 break;
134 default:
135 dev_err(encoder->dev->dev,
136 "unsupported LVDS bus format 0x%04x\n",
137 info->bus_formats[0]);
138 return;
139 }
140
141 if (info->bus_flags & DRM_BUS_FLAG_DATA_LSB_TO_MSB)
142 mode |= RCAR_LVDS_MODE_MIRROR;
143
144 rcar_du_lvdsenc_set_mode(renc->lvds, mode);
145 }
146
147 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
148 .atomic_mode_set = rcar_du_encoder_mode_set,
149 .disable = rcar_du_encoder_disable,
150 .enable = rcar_du_encoder_enable,
151 .atomic_check = rcar_du_encoder_atomic_check,
152 };
153
154 static const struct drm_encoder_funcs encoder_funcs = {
155 .destroy = drm_encoder_cleanup,
156 };
157
rcar_du_encoder_init(struct rcar_du_device * rcdu,enum rcar_du_output output,struct device_node * enc_node,struct device_node * con_node)158 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
159 enum rcar_du_output output,
160 struct device_node *enc_node,
161 struct device_node *con_node)
162 {
163 struct rcar_du_encoder *renc;
164 struct drm_encoder *encoder;
165 struct drm_bridge *bridge = NULL;
166 int ret;
167
168 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
169 if (renc == NULL)
170 return -ENOMEM;
171
172 renc->output = output;
173 encoder = rcar_encoder_to_drm_encoder(renc);
174
175 switch (output) {
176 case RCAR_DU_OUTPUT_LVDS0:
177 renc->lvds = rcdu->lvds[0];
178 break;
179
180 case RCAR_DU_OUTPUT_LVDS1:
181 renc->lvds = rcdu->lvds[1];
182 break;
183
184 default:
185 break;
186 }
187
188 if (enc_node) {
189 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
190 enc_node, output);
191
192 /* Locate the DRM bridge from the encoder DT node. */
193 bridge = of_drm_find_bridge(enc_node);
194 if (!bridge) {
195 ret = -EPROBE_DEFER;
196 goto done;
197 }
198 } else {
199 dev_dbg(rcdu->dev,
200 "initializing internal encoder for output %u\n",
201 output);
202 }
203
204 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
205 DRM_MODE_ENCODER_NONE, NULL);
206 if (ret < 0)
207 goto done;
208
209 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
210
211 if (bridge) {
212 /*
213 * Attach the bridge to the encoder. The bridge will create the
214 * connector.
215 */
216 ret = drm_bridge_attach(encoder, bridge, NULL);
217 if (ret) {
218 drm_encoder_cleanup(encoder);
219 return ret;
220 }
221 } else {
222 /* There's no bridge, create the connector manually. */
223 switch (output) {
224 case RCAR_DU_OUTPUT_LVDS0:
225 case RCAR_DU_OUTPUT_LVDS1:
226 ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
227 break;
228
229 default:
230 ret = -EINVAL;
231 break;
232 }
233 }
234
235 done:
236 if (ret < 0) {
237 if (encoder->name)
238 encoder->funcs->destroy(encoder);
239 devm_kfree(rcdu->dev, renc);
240 }
241
242 return ret;
243 }
244