Merge remote-tracking branch 'sound-asoc/for-next'
[deliverable/linux.git] / drivers / gpu / drm / sun4i / sun4i_rgb.c
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1/*
2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
4 *
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 */
12
13#include <linux/clk.h>
14
15#include <drm/drmP.h>
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_crtc_helper.h>
18#include <drm/drm_panel.h>
19
20#include "sun4i_drv.h"
21#include "sun4i_tcon.h"
0c3ff44c 22#include "sun4i_rgb.h"
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23
24struct sun4i_rgb {
25 struct drm_connector connector;
26 struct drm_encoder encoder;
27
28 struct sun4i_drv *drv;
29};
30
31static inline struct sun4i_rgb *
32drm_connector_to_sun4i_rgb(struct drm_connector *connector)
33{
34 return container_of(connector, struct sun4i_rgb,
35 connector);
36}
37
38static inline struct sun4i_rgb *
39drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
40{
41 return container_of(encoder, struct sun4i_rgb,
42 encoder);
43}
44
45static int sun4i_rgb_get_modes(struct drm_connector *connector)
46{
47 struct sun4i_rgb *rgb =
48 drm_connector_to_sun4i_rgb(connector);
49 struct sun4i_drv *drv = rgb->drv;
50 struct sun4i_tcon *tcon = drv->tcon;
51
52 return drm_panel_get_modes(tcon->panel);
53}
54
55static int sun4i_rgb_mode_valid(struct drm_connector *connector,
56 struct drm_display_mode *mode)
57{
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58 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
59 struct sun4i_drv *drv = rgb->drv;
60 struct sun4i_tcon *tcon = drv->tcon;
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61 u32 hsync = mode->hsync_end - mode->hsync_start;
62 u32 vsync = mode->vsync_end - mode->vsync_start;
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63 unsigned long rate = mode->clock * 1000;
64 long rounded_rate;
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65
66 DRM_DEBUG_DRIVER("Validating modes...\n");
67
68 if (hsync < 1)
69 return MODE_HSYNC_NARROW;
70
71 if (hsync > 0x3ff)
72 return MODE_HSYNC_WIDE;
73
74 if ((mode->hdisplay < 1) || (mode->htotal < 1))
75 return MODE_H_ILLEGAL;
76
77 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
78 return MODE_BAD_HVALUE;
79
80 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
81
82 if (vsync < 1)
83 return MODE_VSYNC_NARROW;
84
85 if (vsync > 0x3ff)
86 return MODE_VSYNC_WIDE;
87
88 if ((mode->vdisplay < 1) || (mode->vtotal < 1))
89 return MODE_V_ILLEGAL;
90
91 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
92 return MODE_BAD_VVALUE;
93
94 DRM_DEBUG_DRIVER("Vertical parameters OK\n");
95
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96 rounded_rate = clk_round_rate(tcon->dclk, rate);
97 if (rounded_rate < rate)
98 return MODE_CLOCK_LOW;
99
100 if (rounded_rate > rate)
101 return MODE_CLOCK_HIGH;
102
103 DRM_DEBUG_DRIVER("Clock rate OK\n");
104
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105 return MODE_OK;
106}
107
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108static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
109 .get_modes = sun4i_rgb_get_modes,
110 .mode_valid = sun4i_rgb_mode_valid,
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111};
112
113static enum drm_connector_status
114sun4i_rgb_connector_detect(struct drm_connector *connector, bool force)
115{
116 return connector_status_connected;
117}
118
119static void
120sun4i_rgb_connector_destroy(struct drm_connector *connector)
121{
122 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
123 struct sun4i_drv *drv = rgb->drv;
124 struct sun4i_tcon *tcon = drv->tcon;
125
126 drm_panel_detach(tcon->panel);
127 drm_connector_cleanup(connector);
128}
129
130static struct drm_connector_funcs sun4i_rgb_con_funcs = {
131 .dpms = drm_atomic_helper_connector_dpms,
132 .detect = sun4i_rgb_connector_detect,
133 .fill_modes = drm_helper_probe_single_connector_modes,
134 .destroy = sun4i_rgb_connector_destroy,
135 .reset = drm_atomic_helper_connector_reset,
136 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
137 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
138};
139
140static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
141 struct drm_crtc_state *crtc_state,
142 struct drm_connector_state *conn_state)
143{
144 return 0;
145}
146
147static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
148{
149 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
150 struct sun4i_drv *drv = rgb->drv;
151 struct sun4i_tcon *tcon = drv->tcon;
152
153 DRM_DEBUG_DRIVER("Enabling RGB output\n");
154
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155 if (!IS_ERR(tcon->panel)) {
156 drm_panel_prepare(tcon->panel);
894f5a9f 157 drm_panel_enable(tcon->panel);
4b309502 158 }
894f5a9f 159
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160 /* encoder->bridge can be NULL; drm_bridge_enable checks for it */
161 drm_bridge_enable(encoder->bridge);
894f5a9f 162
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163 sun4i_tcon_channel_enable(tcon, 0);
164}
165
166static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
167{
168 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
169 struct sun4i_drv *drv = rgb->drv;
170 struct sun4i_tcon *tcon = drv->tcon;
171
172 DRM_DEBUG_DRIVER("Disabling RGB output\n");
173
174 sun4i_tcon_channel_disable(tcon, 0);
894f5a9f 175
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176 /* encoder->bridge can be NULL; drm_bridge_disable checks for it */
177 drm_bridge_disable(encoder->bridge);
894f5a9f 178
4b309502 179 if (!IS_ERR(tcon->panel)) {
894f5a9f 180 drm_panel_disable(tcon->panel);
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181 drm_panel_unprepare(tcon->panel);
182 }
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183}
184
185static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
186 struct drm_display_mode *mode,
187 struct drm_display_mode *adjusted_mode)
188{
189 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
190 struct sun4i_drv *drv = rgb->drv;
191 struct sun4i_tcon *tcon = drv->tcon;
192
193 sun4i_tcon0_mode_set(tcon, mode);
194
195 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
196
197 /* FIXME: This seems to be board specific */
198 clk_set_phase(tcon->dclk, 120);
199}
200
201static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
202 .atomic_check = sun4i_rgb_atomic_check,
203 .mode_set = sun4i_rgb_encoder_mode_set,
204 .disable = sun4i_rgb_encoder_disable,
205 .enable = sun4i_rgb_encoder_enable,
206};
207
208static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
209{
210 drm_encoder_cleanup(encoder);
211}
212
213static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
214 .destroy = sun4i_rgb_enc_destroy,
215};
216
217int sun4i_rgb_init(struct drm_device *drm)
218{
219 struct sun4i_drv *drv = drm->dev_private;
220 struct sun4i_tcon *tcon = drv->tcon;
894f5a9f 221 struct drm_encoder *encoder;
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222 struct sun4i_rgb *rgb;
223 int ret;
224
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225 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
226 if (!rgb)
227 return -ENOMEM;
228 rgb->drv = drv;
894f5a9f 229 encoder = &rgb->encoder;
29e57fab 230
a8444c7e 231 tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
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232 encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
233 if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
234 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
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235 return 0;
236 }
237
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238 drm_encoder_helper_add(&rgb->encoder,
239 &sun4i_rgb_enc_helper_funcs);
240 ret = drm_encoder_init(drm,
241 &rgb->encoder,
242 &sun4i_rgb_enc_funcs,
243 DRM_MODE_ENCODER_NONE,
244 NULL);
245 if (ret) {
246 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
247 goto err_out;
248 }
249
250 /* The RGB encoder can only work with the TCON channel 0 */
251 rgb->encoder.possible_crtcs = BIT(0);
252
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253 if (!IS_ERR(tcon->panel)) {
254 drm_connector_helper_add(&rgb->connector,
255 &sun4i_rgb_con_helper_funcs);
256 ret = drm_connector_init(drm, &rgb->connector,
257 &sun4i_rgb_con_funcs,
258 DRM_MODE_CONNECTOR_Unknown);
259 if (ret) {
260 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
261 goto err_cleanup_connector;
262 }
263
264 drm_mode_connector_attach_encoder(&rgb->connector,
265 &rgb->encoder);
266
267 ret = drm_panel_attach(tcon->panel, &rgb->connector);
268 if (ret) {
269 dev_err(drm->dev, "Couldn't attach our panel\n");
270 goto err_cleanup_connector;
271 }
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272 }
273
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274 if (!IS_ERR(encoder->bridge)) {
275 encoder->bridge->encoder = &rgb->encoder;
29e57fab 276
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277 ret = drm_bridge_attach(drm, encoder->bridge);
278 if (ret) {
279 dev_err(drm->dev, "Couldn't attach our bridge\n");
280 goto err_cleanup_connector;
281 }
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282 } else {
283 encoder->bridge = NULL;
894f5a9f 284 }
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285
286 return 0;
287
288err_cleanup_connector:
289 drm_encoder_cleanup(&rgb->encoder);
290err_out:
291 return ret;
292}
293EXPORT_SYMBOL(sun4i_rgb_init);
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