summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/rcar-du/rcar_du_group.c
blob: d85f0a1c158173b97bf94b251a889f31e8fff948 (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
294
295
// SPDX-License-Identifier: GPL-2.0+
/*
 * rcar_du_group.c  --  R-Car Display Unit Channels Pair
 *
 * Copyright (C) 2013-2015 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

/*
 * The R8A7779 DU is split in per-CRTC resources (scan-out engine, blending
 * unit, timings generator, ...) and device-global resources (start/stop
 * control, planes, ...) shared between the two CRTCs.
 *
 * The R8A7790 introduced a third CRTC with its own set of global resources.
 * This would be modeled as two separate DU device instances if it wasn't for
 * a handful or resources that are shared between the three CRTCs (mostly
 * related to input and output routing). For this reason the R8A7790 DU must be
 * modeled as a single device with three CRTCs, two sets of "semi-global"
 * resources, and a few device-global resources.
 *
 * The rcar_du_group object is a driver specific object, without any real
 * counterpart in the DU documentation, that models those semi-global resources.
 */

#include <linux/clk.h>
#include <linux/io.h>

#include "rcar_du_drv.h"
#include "rcar_du_group.h"
#include "rcar_du_regs.h"

u32 rcar_du_group_read(struct rcar_du_group *rgrp, u32 reg)
{
	return rcar_du_read(rgrp->dev, rgrp->mmio_offset + reg);
}

void rcar_du_group_write(struct rcar_du_group *rgrp, u32 reg, u32 data)
{
	rcar_du_write(rgrp->dev, rgrp->mmio_offset + reg, data);
}

static void rcar_du_group_setup_pins(struct rcar_du_group *rgrp)
{
	u32 defr6 = DEFR6_CODE;

	if (rgrp->channels_mask & BIT(0))
		defr6 |= DEFR6_ODPM02_DISP;

	if (rgrp->channels_mask & BIT(1))
		defr6 |= DEFR6_ODPM12_DISP;

	rcar_du_group_write(rgrp, DEFR6, defr6);
}

static void rcar_du_group_setup_defr8(struct rcar_du_group *rgrp)
{
	struct rcar_du_device *rcdu = rgrp->dev;
	u32 defr8 = DEFR8_CODE;

	if (rcdu->info->gen < 3) {
		defr8 |= DEFR8_DEFE8;

		/*
		 * On Gen2 the DEFR8 register for the first group also controls
		 * RGB output routing to DPAD0 and VSPD1 routing to DU0/1/2 for
		 * DU instances that support it.
		 */
		if (rgrp->index == 0) {
			defr8 |= DEFR8_DRGBS_DU(rcdu->dpad0_source);
			if (rgrp->dev->vspd1_sink == 2)
				defr8 |= DEFR8_VSCS;
		}
	} else {
		/*
		 * On Gen3 VSPD routing can't be configured, and DPAD routing
		 * is set in the group corresponding to the DPAD output (no Gen3
		 * SoC has multiple DPAD sources belonging to separate groups).
		 */
		if (rgrp->index == rcdu->dpad0_source / 2)
			defr8 |= DEFR8_DRGBS_DU(rcdu->dpad0_source);
	}

	rcar_du_group_write(rgrp, DEFR8, defr8);
}

static void rcar_du_group_setup_didsr(struct rcar_du_group *rgrp)
{
	struct rcar_du_device *rcdu = rgrp->dev;
	struct rcar_du_crtc *rcrtc;
	unsigned int num_crtcs = 0;
	unsigned int i;
	u32 didsr;

	/*
	 * Configure input dot clock routing with a hardcoded configuration. If
	 * the DU channel can use the LVDS encoder output clock as the dot
	 * clock, do so. Otherwise route DU_DOTCLKINn signal to DUn.
	 *
	 * Each channel can then select between the dot clock configured here
	 * and the clock provided by the CPG through the ESCR register.
	 */
	if (rcdu->info->gen < 3 && rgrp->index == 0) {
		/*
		 * On Gen2 a single register in the first group controls dot
		 * clock selection for all channels.
		 */
		rcrtc = rcdu->crtcs;
		num_crtcs = rcdu->num_crtcs;
	} else if (rcdu->info->gen == 3 && rgrp->num_crtcs > 1) {
		/*
		 * On Gen3 dot clocks are setup through per-group registers,
		 * only available when the group has two channels.
		 */
		rcrtc = &rcdu->crtcs[rgrp->index * 2];
		num_crtcs = rgrp->num_crtcs;
	}

	if (!num_crtcs)
		return;

	didsr = DIDSR_CODE;
	for (i = 0; i < num_crtcs; ++i, ++rcrtc) {
		if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index))
			didsr |= DIDSR_LCDS_LVDS0(i)
			      |  DIDSR_PDCS_CLK(i, 0);
		else
			didsr |= DIDSR_LCDS_DCLKIN(i)
			      |  DIDSR_PDCS_CLK(i, 0);
	}

	rcar_du_group_write(rgrp, DIDSR, didsr);
}

static void rcar_du_group_setup(struct rcar_du_group *rgrp)
{
	struct rcar_du_device *rcdu = rgrp->dev;

	/* Enable extended features */
	rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE);
	if (rcdu->info->gen < 3) {
		rcar_du_group_write(rgrp, DEFR2, DEFR2_CODE | DEFR2_DEFE2G);
		rcar_du_group_write(rgrp, DEFR3, DEFR3_CODE | DEFR3_DEFE3);
		rcar_du_group_write(rgrp, DEFR4, DEFR4_CODE);
	}
	rcar_du_group_write(rgrp, DEFR5, DEFR5_CODE | DEFR5_DEFE5);

	rcar_du_group_setup_pins(rgrp);

	if (rcar_du_has(rgrp->dev, RCAR_DU_FEATURE_EXT_CTRL_REGS)) {
		rcar_du_group_setup_defr8(rgrp);
		rcar_du_group_setup_didsr(rgrp);
	}

	if (rcdu->info->gen >= 3)
		rcar_du_group_write(rgrp, DEFR10, DEFR10_CODE | DEFR10_DEFE10);

	/*
	 * Use DS1PR and DS2PR to configure planes priorities and connects the
	 * superposition 0 to DU0 pins. DU1 pins will be configured dynamically.
	 */
	rcar_du_group_write(rgrp, DORCR, DORCR_PG1D_DS1 | DORCR_DPRS);

	/* Apply planes to CRTCs association. */
	mutex_lock(&rgrp->lock);
	rcar_du_group_write(rgrp, DPTSR, (rgrp->dptsr_planes << 16) |
			    rgrp->dptsr_planes);
	mutex_unlock(&rgrp->lock);
}

/*
 * rcar_du_group_get - Acquire a reference to the DU channels group
 *
 * Acquiring the first reference setups core registers. A reference must be held
 * before accessing any hardware registers.
 *
 * This function must be called with the DRM mode_config lock held.
 *
 * Return 0 in case of success or a negative error code otherwise.
 */
int rcar_du_group_get(struct rcar_du_group *rgrp)
{
	if (rgrp->use_count)
		goto done;

	rcar_du_group_setup(rgrp);

done:
	rgrp->use_count++;
	return 0;
}

/*
 * rcar_du_group_put - Release a reference to the DU
 *
 * This function must be called with the DRM mode_config lock held.
 */
void rcar_du_group_put(struct rcar_du_group *rgrp)
{
	--rgrp->use_count;
}

static void __rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)
{
	struct rcar_du_crtc *rcrtc = &rgrp->dev->crtcs[rgrp->index * 2];

	rcar_du_crtc_dsysr_clr_set(rcrtc, DSYSR_DRES | DSYSR_DEN,
				   start ? DSYSR_DEN : DSYSR_DRES);
}

void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)
{
	/*
	 * Many of the configuration bits are only updated when the display
	 * reset (DRES) bit in DSYSR is set to 1, disabling *both* CRTCs. Some
	 * of those bits could be pre-configured, but others (especially the
	 * bits related to plane assignment to display timing controllers) need
	 * to be modified at runtime.
	 *
	 * Restart the display controller if a start is requested. Sorry for the
	 * flicker. It should be possible to move most of the "DRES-update" bits
	 * setup to driver initialization time and minimize the number of cases
	 * when the display controller will have to be restarted.
	 */
	if (start) {
		if (rgrp->used_crtcs++ != 0)
			__rcar_du_group_start_stop(rgrp, false);
		__rcar_du_group_start_stop(rgrp, true);
	} else {
		if (--rgrp->used_crtcs == 0)
			__rcar_du_group_start_stop(rgrp, false);
	}
}

void rcar_du_group_restart(struct rcar_du_group *rgrp)
{
	rgrp->need_restart = false;

	__rcar_du_group_start_stop(rgrp, false);
	__rcar_du_group_start_stop(rgrp, true);
}

int rcar_du_set_dpad0_vsp1_routing(struct rcar_du_device *rcdu)
{
	struct rcar_du_group *rgrp;
	struct rcar_du_crtc *crtc;
	unsigned int index;
	int ret;

	if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_EXT_CTRL_REGS))
		return 0;

	/*
	 * RGB output routing to DPAD0 and VSP1D routing to DU0/1/2 are
	 * configured in the DEFR8 register of the first group on Gen2 and the
	 * last group on Gen3. As this function can be called with the DU
	 * channels of the corresponding CRTCs disabled, we need to enable the
	 * group clock before accessing the register.
	 */
	index = rcdu->info->gen < 3 ? 0 : DIV_ROUND_UP(rcdu->num_crtcs, 2) - 1;
	rgrp = &rcdu->groups[index];
	crtc = &rcdu->crtcs[index * 2];

	ret = clk_prepare_enable(crtc->clock);
	if (ret < 0)
		return ret;

	rcar_du_group_setup_defr8(rgrp);

	clk_disable_unprepare(crtc->clock);

	return 0;
}

int rcar_du_group_set_routing(struct rcar_du_group *rgrp)
{
	struct rcar_du_crtc *crtc0 = &rgrp->dev->crtcs[rgrp->index * 2];
	u32 dorcr = rcar_du_group_read(rgrp, DORCR);

	dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK);

	/*
	 * Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and
	 * CRTC 1 in all other cases to avoid cloning CRTC 0 to DPAD0 and DPAD1
	 * by default.
	 */
	if (crtc0->outputs & BIT(RCAR_DU_OUTPUT_DPAD1))
		dorcr |= DORCR_PG2D_DS1;
	else
		dorcr |= DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_DS2;

	rcar_du_group_write(rgrp, DORCR, dorcr);

	return rcar_du_set_dpad0_vsp1_routing(rgrp->dev);
}