summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/sun4i/sun4i_rgb.c
blob: c3ff10f559cc4811755f764d6ebbfd999a8ee7e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
/*
 * Copyright (C) 2015 Free Electrons
 * Copyright (C) 2015 NextThing Co
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 */

#include <linux/clk.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>

#include "sun4i_drv.h"
#include "sun4i_tcon.h"
#include "sun4i_rgb.h"

struct sun4i_rgb {
	struct drm_connector	connector;
	struct drm_encoder	encoder;

	struct sun4i_drv	*drv;
};

static inline struct sun4i_rgb *
drm_connector_to_sun4i_rgb(struct drm_connector *connector)
{
	return container_of(connector, struct sun4i_rgb,
			    connector);
}

static inline struct sun4i_rgb *
drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
{
	return container_of(encoder, struct sun4i_rgb,
			    encoder);
}

static int sun4i_rgb_get_modes(struct drm_connector *connector)
{
	struct sun4i_rgb *rgb =
		drm_connector_to_sun4i_rgb(connector);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;

	return drm_panel_get_modes(tcon->panel);
}

static int sun4i_rgb_mode_valid(struct drm_connector *connector,
				struct drm_display_mode *mode)
{
	struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;
	u32 hsync = mode->hsync_end - mode->hsync_start;
	u32 vsync = mode->vsync_end - mode->vsync_start;
	unsigned long rate = mode->clock * 1000;
	long rounded_rate;

	DRM_DEBUG_DRIVER("Validating modes...\n");

	if (hsync < 1)
		return MODE_HSYNC_NARROW;

	if (hsync > 0x3ff)
		return MODE_HSYNC_WIDE;

	if ((mode->hdisplay < 1) || (mode->htotal < 1))
		return MODE_H_ILLEGAL;

	if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
		return MODE_BAD_HVALUE;

	DRM_DEBUG_DRIVER("Horizontal parameters OK\n");

	if (vsync < 1)
		return MODE_VSYNC_NARROW;

	if (vsync > 0x3ff)
		return MODE_VSYNC_WIDE;

	if ((mode->vdisplay < 1) || (mode->vtotal < 1))
		return MODE_V_ILLEGAL;

	if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
		return MODE_BAD_VVALUE;

	DRM_DEBUG_DRIVER("Vertical parameters OK\n");

	rounded_rate = clk_round_rate(tcon->dclk, rate);
	if (rounded_rate < rate)
		return MODE_CLOCK_LOW;

	if (rounded_rate > rate)
		return MODE_CLOCK_HIGH;

	DRM_DEBUG_DRIVER("Clock rate OK\n");

	return MODE_OK;
}

static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
	.get_modes	= sun4i_rgb_get_modes,
	.mode_valid	= sun4i_rgb_mode_valid,
};

static enum drm_connector_status
sun4i_rgb_connector_detect(struct drm_connector *connector, bool force)
{
	return connector_status_connected;
}

static void
sun4i_rgb_connector_destroy(struct drm_connector *connector)
{
	struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;

	drm_panel_detach(tcon->panel);
	drm_connector_cleanup(connector);
}

static struct drm_connector_funcs sun4i_rgb_con_funcs = {
	.dpms			= drm_atomic_helper_connector_dpms,
	.detect			= sun4i_rgb_connector_detect,
	.fill_modes		= drm_helper_probe_single_connector_modes,
	.destroy		= sun4i_rgb_connector_destroy,
	.reset			= drm_atomic_helper_connector_reset,
	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
};

static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
				  struct drm_crtc_state *crtc_state,
				  struct drm_connector_state *conn_state)
{
	return 0;
}

static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
{
	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;

	DRM_DEBUG_DRIVER("Enabling RGB output\n");

	if (!IS_ERR(tcon->panel)) {
		drm_panel_prepare(tcon->panel);
		drm_panel_enable(tcon->panel);
	}

	/* encoder->bridge can be NULL; drm_bridge_enable checks for it */
	drm_bridge_enable(encoder->bridge);

	sun4i_tcon_channel_enable(tcon, 0);
}

static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
{
	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;

	DRM_DEBUG_DRIVER("Disabling RGB output\n");

	sun4i_tcon_channel_disable(tcon, 0);

	/* encoder->bridge can be NULL; drm_bridge_disable checks for it */
	drm_bridge_disable(encoder->bridge);

	if (!IS_ERR(tcon->panel)) {
		drm_panel_disable(tcon->panel);
		drm_panel_unprepare(tcon->panel);
	}
}

static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
				       struct drm_display_mode *mode,
				       struct drm_display_mode *adjusted_mode)
{
	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
	struct sun4i_drv *drv = rgb->drv;
	struct sun4i_tcon *tcon = drv->tcon;

	sun4i_tcon0_mode_set(tcon, mode);

	clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);

	/* FIXME: This seems to be board specific */
	clk_set_phase(tcon->dclk, 120);
}

static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
	.atomic_check	= sun4i_rgb_atomic_check,
	.mode_set	= sun4i_rgb_encoder_mode_set,
	.disable	= sun4i_rgb_encoder_disable,
	.enable		= sun4i_rgb_encoder_enable,
};

static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
	.destroy	= sun4i_rgb_enc_destroy,
};

int sun4i_rgb_init(struct drm_device *drm)
{
	struct sun4i_drv *drv = drm->dev_private;
	struct sun4i_tcon *tcon = drv->tcon;
	struct drm_encoder *encoder;
	struct sun4i_rgb *rgb;
	int ret;

	rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
	if (!rgb)
		return -ENOMEM;
	rgb->drv = drv;
	encoder = &rgb->encoder;

	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
		return 0;
	}

	drm_encoder_helper_add(&rgb->encoder,
			       &sun4i_rgb_enc_helper_funcs);
	ret = drm_encoder_init(drm,
			       &rgb->encoder,
			       &sun4i_rgb_enc_funcs,
			       DRM_MODE_ENCODER_NONE,
			       NULL);
	if (ret) {
		dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
		goto err_out;
	}

	/* The RGB encoder can only work with the TCON channel 0 */
	rgb->encoder.possible_crtcs = BIT(0);

	if (!IS_ERR(tcon->panel)) {
		drm_connector_helper_add(&rgb->connector,
					 &sun4i_rgb_con_helper_funcs);
		ret = drm_connector_init(drm, &rgb->connector,
					 &sun4i_rgb_con_funcs,
					 DRM_MODE_CONNECTOR_Unknown);
		if (ret) {
			dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
			goto err_cleanup_connector;
		}

		drm_mode_connector_attach_encoder(&rgb->connector,
						  &rgb->encoder);

		ret = drm_panel_attach(tcon->panel, &rgb->connector);
		if (ret) {
			dev_err(drm->dev, "Couldn't attach our panel\n");
			goto err_cleanup_connector;
		}
	}

	if (!IS_ERR(encoder->bridge)) {
		encoder->bridge->encoder = &rgb->encoder;

		ret = drm_bridge_attach(drm, encoder->bridge);
		if (ret) {
			dev_err(drm->dev, "Couldn't attach our bridge\n");
			goto err_cleanup_connector;
		}
	} else {
		encoder->bridge = NULL;
	}

	return 0;

err_cleanup_connector:
	drm_encoder_cleanup(&rgb->encoder);
err_out:
	return ret;
}
EXPORT_SYMBOL(sun4i_rgb_init);