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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Free Electrons
4 * Copyright (C) 2015 NextThing Co
5 *
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 */
8
9#include <linux/clk.h>
10
11#include <drm/drm_atomic_helper.h>
12#include <drm/drm_of.h>
13#include <drm/drm_panel.h>
14#include <drm/drm_print.h>
15#include <drm/drm_probe_helper.h>
16
17#include "sun4i_crtc.h"
18#include "sun4i_tcon.h"
19#include "sun4i_rgb.h"
20
21struct sun4i_rgb {
22 struct drm_connector connector;
23 struct drm_encoder encoder;
24
25 struct sun4i_tcon *tcon;
26 struct drm_panel *panel;
27 struct drm_bridge *bridge;
28};
29
30static inline struct sun4i_rgb *
31drm_connector_to_sun4i_rgb(struct drm_connector *connector)
32{
33 return container_of(connector, struct sun4i_rgb,
34 connector);
35}
36
37static inline struct sun4i_rgb *
38drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
39{
40 return container_of(encoder, struct sun4i_rgb,
41 encoder);
42}
43
44static int sun4i_rgb_get_modes(struct drm_connector *connector)
45{
46 struct sun4i_rgb *rgb =
47 drm_connector_to_sun4i_rgb(connector);
48
49 return drm_panel_get_modes(rgb->panel);
50}
51
52/*
53 * VESA DMT defines a tolerance of 0.5% on the pixel clock, while the
54 * CVT spec reuses that tolerance in its examples, so it looks to be a
55 * good default tolerance for the EDID-based modes. Define it to 5 per
56 * mille to avoid floating point operations.
57 */
58#define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 5
59
60static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
61 const struct drm_display_mode *mode)
62{
63 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
64 struct sun4i_tcon *tcon = rgb->tcon;
65 u32 hsync = mode->hsync_end - mode->hsync_start;
66 u32 vsync = mode->vsync_end - mode->vsync_start;
67 unsigned long long rate = mode->clock * 1000;
68 unsigned long long lowest, highest;
69 unsigned long long rounded_rate;
70
71 DRM_DEBUG_DRIVER("Validating modes...\n");
72
73 if (hsync < 1)
74 return MODE_HSYNC_NARROW;
75
76 if (hsync > 0x3ff)
77 return MODE_HSYNC_WIDE;
78
79 if ((mode->hdisplay < 1) || (mode->htotal < 1))
80 return MODE_H_ILLEGAL;
81
82 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
83 return MODE_BAD_HVALUE;
84
85 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
86
87 if (vsync < 1)
88 return MODE_VSYNC_NARROW;
89
90 if (vsync > 0x3ff)
91 return MODE_VSYNC_WIDE;
92
93 if ((mode->vdisplay < 1) || (mode->vtotal < 1))
94 return MODE_V_ILLEGAL;
95
96 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
97 return MODE_BAD_VVALUE;
98
99 DRM_DEBUG_DRIVER("Vertical parameters OK\n");
100
101 /*
102 * TODO: We should use the struct display_timing if available
103 * and / or trying to stretch the timings within that
104 * tolerancy to take care of panels that we wouldn't be able
105 * to have a exact match for.
106 */
107 if (rgb->panel) {
108 DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks");
109 goto out;
110 }
111
112 /*
113 * That shouldn't ever happen unless something is really wrong, but it
114 * doesn't harm to check.
115 */
116 if (!rgb->bridge)
117 goto out;
118
119 tcon->dclk_min_div = 6;
120 tcon->dclk_max_div = 127;
121 rounded_rate = clk_round_rate(tcon->dclk, rate);
122
123 lowest = rate * (1000 - SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
124 do_div(lowest, 1000);
125 if (rounded_rate < lowest)
126 return MODE_CLOCK_LOW;
127
128 highest = rate * (1000 + SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
129 do_div(highest, 1000);
130 if (rounded_rate > highest)
131 return MODE_CLOCK_HIGH;
132
133out:
134 DRM_DEBUG_DRIVER("Clock rate OK\n");
135
136 return MODE_OK;
137}
138
139static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
140 .get_modes = sun4i_rgb_get_modes,
141};
142
143static void
144sun4i_rgb_connector_destroy(struct drm_connector *connector)
145{
146 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
147
148 drm_panel_detach(rgb->panel);
149 drm_connector_cleanup(connector);
150}
151
152static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
153 .fill_modes = drm_helper_probe_single_connector_modes,
154 .destroy = sun4i_rgb_connector_destroy,
155 .reset = drm_atomic_helper_connector_reset,
156 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
157 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
158};
159
160static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
161{
162 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
163
164 DRM_DEBUG_DRIVER("Enabling RGB output\n");
165
166 if (rgb->panel) {
167 drm_panel_prepare(rgb->panel);
168 drm_panel_enable(rgb->panel);
169 }
170}
171
172static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
173{
174 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
175
176 DRM_DEBUG_DRIVER("Disabling RGB output\n");
177
178 if (rgb->panel) {
179 drm_panel_disable(rgb->panel);
180 drm_panel_unprepare(rgb->panel);
181 }
182}
183
184static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
185 .disable = sun4i_rgb_encoder_disable,
186 .enable = sun4i_rgb_encoder_enable,
187 .mode_valid = sun4i_rgb_mode_valid,
188};
189
190static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
191{
192 drm_encoder_cleanup(encoder);
193}
194
195static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
196 .destroy = sun4i_rgb_enc_destroy,
197};
198
199int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
200{
201 struct drm_encoder *encoder;
202 struct sun4i_rgb *rgb;
203 int ret;
204
205 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
206 if (!rgb)
207 return -ENOMEM;
208 rgb->tcon = tcon;
209 encoder = &rgb->encoder;
210
211 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
212 &rgb->panel, &rgb->bridge);
213 if (ret) {
214 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
215 return 0;
216 }
217
218 drm_encoder_helper_add(&rgb->encoder,
219 &sun4i_rgb_enc_helper_funcs);
220 ret = drm_encoder_init(drm,
221 &rgb->encoder,
222 &sun4i_rgb_enc_funcs,
223 DRM_MODE_ENCODER_NONE,
224 NULL);
225 if (ret) {
226 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
227 goto err_out;
228 }
229
230 /* The RGB encoder can only work with the TCON channel 0 */
231 rgb->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
232
233 if (rgb->panel) {
234 drm_connector_helper_add(&rgb->connector,
235 &sun4i_rgb_con_helper_funcs);
236 ret = drm_connector_init(drm, &rgb->connector,
237 &sun4i_rgb_con_funcs,
238 DRM_MODE_CONNECTOR_Unknown);
239 if (ret) {
240 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
241 goto err_cleanup_connector;
242 }
243
244 drm_connector_attach_encoder(&rgb->connector,
245 &rgb->encoder);
246
247 ret = drm_panel_attach(rgb->panel, &rgb->connector);
248 if (ret) {
249 dev_err(drm->dev, "Couldn't attach our panel\n");
250 goto err_cleanup_connector;
251 }
252 }
253
254 if (rgb->bridge) {
255 ret = drm_bridge_attach(encoder, rgb->bridge, NULL);
256 if (ret) {
257 dev_err(drm->dev, "Couldn't attach our bridge\n");
258 goto err_cleanup_connector;
259 }
260 }
261
262 return 0;
263
264err_cleanup_connector:
265 drm_encoder_cleanup(&rgb->encoder);
266err_out:
267 return ret;
268}
269EXPORT_SYMBOL(sun4i_rgb_init);
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
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{
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
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,
111};
112
113static void
114sun4i_rgb_connector_destroy(struct drm_connector *connector)
115{
116 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
117 struct sun4i_drv *drv = rgb->drv;
118 struct sun4i_tcon *tcon = drv->tcon;
119
120 drm_panel_detach(tcon->panel);
121 drm_connector_cleanup(connector);
122}
123
124static struct drm_connector_funcs sun4i_rgb_con_funcs = {
125 .dpms = drm_atomic_helper_connector_dpms,
126 .fill_modes = drm_helper_probe_single_connector_modes,
127 .destroy = sun4i_rgb_connector_destroy,
128 .reset = drm_atomic_helper_connector_reset,
129 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
130 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
131};
132
133static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
134 struct drm_crtc_state *crtc_state,
135 struct drm_connector_state *conn_state)
136{
137 return 0;
138}
139
140static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
141{
142 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
143 struct sun4i_drv *drv = rgb->drv;
144 struct sun4i_tcon *tcon = drv->tcon;
145
146 DRM_DEBUG_DRIVER("Enabling RGB output\n");
147
148 if (!IS_ERR(tcon->panel))
149 drm_panel_prepare(tcon->panel);
150
151 sun4i_tcon_channel_enable(tcon, 0);
152
153 if (!IS_ERR(tcon->panel))
154 drm_panel_enable(tcon->panel);
155}
156
157static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
158{
159 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
160 struct sun4i_drv *drv = rgb->drv;
161 struct sun4i_tcon *tcon = drv->tcon;
162
163 DRM_DEBUG_DRIVER("Disabling RGB output\n");
164
165 if (!IS_ERR(tcon->panel))
166 drm_panel_disable(tcon->panel);
167
168 sun4i_tcon_channel_disable(tcon, 0);
169
170 if (!IS_ERR(tcon->panel))
171 drm_panel_unprepare(tcon->panel);
172}
173
174static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
175 struct drm_display_mode *mode,
176 struct drm_display_mode *adjusted_mode)
177{
178 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
179 struct sun4i_drv *drv = rgb->drv;
180 struct sun4i_tcon *tcon = drv->tcon;
181
182 sun4i_tcon0_mode_set(tcon, mode);
183
184 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
185
186 /* FIXME: This seems to be board specific */
187 clk_set_phase(tcon->dclk, 120);
188}
189
190static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
191 .atomic_check = sun4i_rgb_atomic_check,
192 .mode_set = sun4i_rgb_encoder_mode_set,
193 .disable = sun4i_rgb_encoder_disable,
194 .enable = sun4i_rgb_encoder_enable,
195};
196
197static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
198{
199 drm_encoder_cleanup(encoder);
200}
201
202static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
203 .destroy = sun4i_rgb_enc_destroy,
204};
205
206int sun4i_rgb_init(struct drm_device *drm)
207{
208 struct sun4i_drv *drv = drm->dev_private;
209 struct sun4i_tcon *tcon = drv->tcon;
210 struct drm_encoder *encoder;
211 struct sun4i_rgb *rgb;
212 int ret;
213
214 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
215 if (!rgb)
216 return -ENOMEM;
217 rgb->drv = drv;
218 encoder = &rgb->encoder;
219
220 tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
221 encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
222 if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
223 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
224 return 0;
225 }
226
227 drm_encoder_helper_add(&rgb->encoder,
228 &sun4i_rgb_enc_helper_funcs);
229 ret = drm_encoder_init(drm,
230 &rgb->encoder,
231 &sun4i_rgb_enc_funcs,
232 DRM_MODE_ENCODER_NONE,
233 NULL);
234 if (ret) {
235 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
236 goto err_out;
237 }
238
239 /* The RGB encoder can only work with the TCON channel 0 */
240 rgb->encoder.possible_crtcs = BIT(0);
241
242 if (!IS_ERR(tcon->panel)) {
243 drm_connector_helper_add(&rgb->connector,
244 &sun4i_rgb_con_helper_funcs);
245 ret = drm_connector_init(drm, &rgb->connector,
246 &sun4i_rgb_con_funcs,
247 DRM_MODE_CONNECTOR_Unknown);
248 if (ret) {
249 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
250 goto err_cleanup_connector;
251 }
252
253 drm_mode_connector_attach_encoder(&rgb->connector,
254 &rgb->encoder);
255
256 ret = drm_panel_attach(tcon->panel, &rgb->connector);
257 if (ret) {
258 dev_err(drm->dev, "Couldn't attach our panel\n");
259 goto err_cleanup_connector;
260 }
261 }
262
263 if (!IS_ERR(encoder->bridge)) {
264 encoder->bridge->encoder = &rgb->encoder;
265
266 ret = drm_bridge_attach(drm, encoder->bridge);
267 if (ret) {
268 dev_err(drm->dev, "Couldn't attach our bridge\n");
269 goto err_cleanup_connector;
270 }
271 } else {
272 encoder->bridge = NULL;
273 }
274
275 return 0;
276
277err_cleanup_connector:
278 drm_encoder_cleanup(&rgb->encoder);
279err_out:
280 return ret;
281}
282EXPORT_SYMBOL(sun4i_rgb_init);