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"
22 #include "sun4i_rgb.h"
23
24 struct sun4i_rgb {
25 struct drm_connector connector;
26 struct drm_encoder encoder;
27
28 struct sun4i_drv *drv;
29 };
30
31 static inline struct sun4i_rgb *
drm_connector_to_sun4i_rgb(struct drm_connector * connector)32 drm_connector_to_sun4i_rgb(struct drm_connector *connector)
33 {
34 return container_of(connector, struct sun4i_rgb,
35 connector);
36 }
37
38 static inline struct sun4i_rgb *
drm_encoder_to_sun4i_rgb(struct drm_encoder * encoder)39 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
40 {
41 return container_of(encoder, struct sun4i_rgb,
42 encoder);
43 }
44
sun4i_rgb_get_modes(struct drm_connector * connector)45 static 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
sun4i_rgb_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)55 static int sun4i_rgb_mode_valid(struct drm_connector *connector,
56 struct drm_display_mode *mode)
57 {
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;
61 u32 hsync = mode->hsync_end - mode->hsync_start;
62 u32 vsync = mode->vsync_end - mode->vsync_start;
63 unsigned long rate = mode->clock * 1000;
64 long rounded_rate;
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
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
105 return MODE_OK;
106 }
107
108 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
109 .get_modes = sun4i_rgb_get_modes,
110 .mode_valid = sun4i_rgb_mode_valid,
111 };
112
113 static enum drm_connector_status
sun4i_rgb_connector_detect(struct drm_connector * connector,bool force)114 sun4i_rgb_connector_detect(struct drm_connector *connector, bool force)
115 {
116 return connector_status_connected;
117 }
118
119 static void
sun4i_rgb_connector_destroy(struct drm_connector * connector)120 sun4i_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
130 static 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
sun4i_rgb_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)140 static 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
sun4i_rgb_encoder_enable(struct drm_encoder * encoder)147 static 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
155 if (!IS_ERR(tcon->panel))
156 drm_panel_prepare(tcon->panel);
157
158 sun4i_tcon_channel_enable(tcon, 0);
159
160 if (!IS_ERR(tcon->panel))
161 drm_panel_enable(tcon->panel);
162 }
163
sun4i_rgb_encoder_disable(struct drm_encoder * encoder)164 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
165 {
166 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
167 struct sun4i_drv *drv = rgb->drv;
168 struct sun4i_tcon *tcon = drv->tcon;
169
170 DRM_DEBUG_DRIVER("Disabling RGB output\n");
171
172 if (!IS_ERR(tcon->panel))
173 drm_panel_disable(tcon->panel);
174
175 sun4i_tcon_channel_disable(tcon, 0);
176
177 if (!IS_ERR(tcon->panel))
178 drm_panel_unprepare(tcon->panel);
179 }
180
sun4i_rgb_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)181 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
182 struct drm_display_mode *mode,
183 struct drm_display_mode *adjusted_mode)
184 {
185 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
186 struct sun4i_drv *drv = rgb->drv;
187 struct sun4i_tcon *tcon = drv->tcon;
188
189 sun4i_tcon0_mode_set(tcon, mode);
190
191 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
192
193 /* FIXME: This seems to be board specific */
194 clk_set_phase(tcon->dclk, 120);
195 }
196
197 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
198 .atomic_check = sun4i_rgb_atomic_check,
199 .mode_set = sun4i_rgb_encoder_mode_set,
200 .disable = sun4i_rgb_encoder_disable,
201 .enable = sun4i_rgb_encoder_enable,
202 };
203
sun4i_rgb_enc_destroy(struct drm_encoder * encoder)204 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
205 {
206 drm_encoder_cleanup(encoder);
207 }
208
209 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
210 .destroy = sun4i_rgb_enc_destroy,
211 };
212
sun4i_rgb_init(struct drm_device * drm)213 int sun4i_rgb_init(struct drm_device *drm)
214 {
215 struct sun4i_drv *drv = drm->dev_private;
216 struct sun4i_tcon *tcon = drv->tcon;
217 struct drm_encoder *encoder;
218 struct sun4i_rgb *rgb;
219 int ret;
220
221 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
222 if (!rgb)
223 return -ENOMEM;
224 rgb->drv = drv;
225 encoder = &rgb->encoder;
226
227 tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
228 encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
229 if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
230 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
231 return 0;
232 }
233
234 drm_encoder_helper_add(&rgb->encoder,
235 &sun4i_rgb_enc_helper_funcs);
236 ret = drm_encoder_init(drm,
237 &rgb->encoder,
238 &sun4i_rgb_enc_funcs,
239 DRM_MODE_ENCODER_NONE,
240 NULL);
241 if (ret) {
242 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
243 goto err_out;
244 }
245
246 /* The RGB encoder can only work with the TCON channel 0 */
247 rgb->encoder.possible_crtcs = BIT(0);
248
249 if (!IS_ERR(tcon->panel)) {
250 drm_connector_helper_add(&rgb->connector,
251 &sun4i_rgb_con_helper_funcs);
252 ret = drm_connector_init(drm, &rgb->connector,
253 &sun4i_rgb_con_funcs,
254 DRM_MODE_CONNECTOR_Unknown);
255 if (ret) {
256 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
257 goto err_cleanup_connector;
258 }
259
260 drm_mode_connector_attach_encoder(&rgb->connector,
261 &rgb->encoder);
262
263 ret = drm_panel_attach(tcon->panel, &rgb->connector);
264 if (ret) {
265 dev_err(drm->dev, "Couldn't attach our panel\n");
266 goto err_cleanup_connector;
267 }
268 }
269
270 if (!IS_ERR(encoder->bridge)) {
271 encoder->bridge->encoder = &rgb->encoder;
272
273 ret = drm_bridge_attach(drm, encoder->bridge);
274 if (ret) {
275 dev_err(drm->dev, "Couldn't attach our bridge\n");
276 goto err_cleanup_connector;
277 }
278 } else {
279 encoder->bridge = NULL;
280 }
281
282 return 0;
283
284 err_cleanup_connector:
285 drm_encoder_cleanup(&rgb->encoder);
286 err_out:
287 return ret;
288 }
289 EXPORT_SYMBOL(sun4i_rgb_init);
290