Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * rcar_du_encoder.c -- R-Car Display Unit Encoder
3 *
4 * Copyright (C) 2013 Renesas 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_kms.h"
23#include "rcar_du_lvdscon.h"
24#include "rcar_du_lvdsenc.h"
25#include "rcar_du_vgacon.h"
26
27/* -----------------------------------------------------------------------------
28 * Common connector functions
29 */
30
31struct drm_encoder *
32rcar_du_connector_best_encoder(struct drm_connector *connector)
33{
34 struct rcar_du_connector *rcon = to_rcar_connector(connector);
35
36 return &rcon->encoder->encoder;
37}
38
39/* -----------------------------------------------------------------------------
40 * Encoder
41 */
42
43static void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
44{
45 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
46
47 if (renc->lvds)
48 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc, mode);
49}
50
51static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
52 const struct drm_display_mode *mode,
53 struct drm_display_mode *adjusted_mode)
54{
55 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
56 const struct drm_display_mode *panel_mode;
57 struct drm_device *dev = encoder->dev;
58 struct drm_connector *connector;
59 bool found = false;
60
61 /* DAC encoders have currently no restriction on the mode. */
62 if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
63 return true;
64
65 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
66 if (connector->encoder == encoder) {
67 found = true;
68 break;
69 }
70 }
71
72 if (!found) {
73 dev_dbg(dev->dev, "mode_fixup: no connector found\n");
74 return false;
75 }
76
77 if (list_empty(&connector->modes)) {
78 dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
79 return false;
80 }
81
82 panel_mode = list_first_entry(&connector->modes,
83 struct drm_display_mode, head);
84
85 /* We're not allowed to modify the resolution. */
86 if (mode->hdisplay != panel_mode->hdisplay ||
87 mode->vdisplay != panel_mode->vdisplay)
88 return false;
89
90 /* The flat panel mode is fixed, just copy it to the adjusted mode. */
91 drm_mode_copy(adjusted_mode, panel_mode);
92
93 /* The internal LVDS encoder has a clock frequency operating range of
94 * 30MHz to 150MHz. Clamp the clock accordingly.
95 */
96 if (renc->lvds)
97 adjusted_mode->clock = clamp(adjusted_mode->clock,
98 30000, 150000);
99
100 return true;
101}
102
103static void rcar_du_encoder_mode_prepare(struct drm_encoder *encoder)
104{
105 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
106
107 if (renc->lvds)
108 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
109 DRM_MODE_DPMS_OFF);
110}
111
112static void rcar_du_encoder_mode_commit(struct drm_encoder *encoder)
113{
114 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
115
116 if (renc->lvds)
117 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
118 DRM_MODE_DPMS_ON);
119}
120
121static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
122 struct drm_display_mode *mode,
123 struct drm_display_mode *adjusted_mode)
124{
125 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
126
127 rcar_du_crtc_route_output(encoder->crtc, renc->output);
128}
129
130static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
131 .dpms = rcar_du_encoder_dpms,
132 .mode_fixup = rcar_du_encoder_mode_fixup,
133 .prepare = rcar_du_encoder_mode_prepare,
134 .commit = rcar_du_encoder_mode_commit,
135 .mode_set = rcar_du_encoder_mode_set,
136};
137
138static const struct drm_encoder_funcs encoder_funcs = {
139 .destroy = drm_encoder_cleanup,
140};
141
142int rcar_du_encoder_init(struct rcar_du_device *rcdu,
143 enum rcar_du_encoder_type type,
144 enum rcar_du_output output,
145 const struct rcar_du_encoder_data *data)
146{
147 struct rcar_du_encoder *renc;
148 unsigned int encoder_type;
149 int ret;
150
151 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
152 if (renc == NULL)
153 return -ENOMEM;
154
155 renc->output = output;
156
157 switch (output) {
158 case RCAR_DU_OUTPUT_LVDS0:
159 renc->lvds = rcdu->lvds[0];
160 break;
161
162 case RCAR_DU_OUTPUT_LVDS1:
163 renc->lvds = rcdu->lvds[1];
164 break;
165
166 default:
167 break;
168 }
169
170 switch (type) {
171 case RCAR_DU_ENCODER_VGA:
172 encoder_type = DRM_MODE_ENCODER_DAC;
173 break;
174 case RCAR_DU_ENCODER_LVDS:
175 encoder_type = DRM_MODE_ENCODER_LVDS;
176 break;
177 case RCAR_DU_ENCODER_NONE:
178 default:
179 /* No external encoder, use the internal encoder type. */
180 encoder_type = rcdu->info->routes[output].encoder_type;
181 break;
182 }
183
184 ret = drm_encoder_init(rcdu->ddev, &renc->encoder, &encoder_funcs,
185 encoder_type);
186 if (ret < 0)
187 return ret;
188
189 drm_encoder_helper_add(&renc->encoder, &encoder_helper_funcs);
190
191 switch (encoder_type) {
192 case DRM_MODE_ENCODER_LVDS:
193 return rcar_du_lvds_connector_init(rcdu, renc,
194 &data->connector.lvds.panel);
195
196 case DRM_MODE_ENCODER_DAC:
197 return rcar_du_vga_connector_init(rcdu, renc);
198
199 default:
200 return -EINVAL;
201 }
202}