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cb2025d2 LP |
1 | /* |
2 | * rcar_du_group.c -- R-Car Display Unit Channels Pair | |
3 | * | |
36d50464 | 4 | * Copyright (C) 2013-2014 Renesas Electronics Corporation |
cb2025d2 LP |
5 | * |
6 | * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* | |
15 | * The R8A7779 DU is split in per-CRTC resources (scan-out engine, blending | |
16 | * unit, timings generator, ...) and device-global resources (start/stop | |
17 | * control, planes, ...) shared between the two CRTCs. | |
18 | * | |
19 | * The R8A7790 introduced a third CRTC with its own set of global resources. | |
20 | * This would be modeled as two separate DU device instances if it wasn't for | |
21 | * a handful or resources that are shared between the three CRTCs (mostly | |
22 | * related to input and output routing). For this reason the R8A7790 DU must be | |
23 | * modeled as a single device with three CRTCs, two sets of "semi-global" | |
24 | * resources, and a few device-global resources. | |
25 | * | |
26 | * The rcar_du_group object is a driver specific object, without any real | |
27 | * counterpart in the DU documentation, that models those semi-global resources. | |
28 | */ | |
29 | ||
7cbc05cb | 30 | #include <linux/clk.h> |
cb2025d2 LP |
31 | #include <linux/io.h> |
32 | ||
33 | #include "rcar_du_drv.h" | |
34 | #include "rcar_du_group.h" | |
35 | #include "rcar_du_regs.h" | |
36 | ||
a5f0ef59 | 37 | u32 rcar_du_group_read(struct rcar_du_group *rgrp, u32 reg) |
cb2025d2 LP |
38 | { |
39 | return rcar_du_read(rgrp->dev, rgrp->mmio_offset + reg); | |
40 | } | |
41 | ||
a5f0ef59 | 42 | void rcar_du_group_write(struct rcar_du_group *rgrp, u32 reg, u32 data) |
cb2025d2 LP |
43 | { |
44 | rcar_du_write(rgrp->dev, rgrp->mmio_offset + reg, data); | |
45 | } | |
46 | ||
7cbc05cb LP |
47 | static void rcar_du_group_setup_defr8(struct rcar_du_group *rgrp) |
48 | { | |
49 | u32 defr8 = DEFR8_CODE | DEFR8_DEFE8; | |
50 | ||
7cbc05cb LP |
51 | /* The DEFR8 register for the first group also controls RGB output |
52 | * routing to DPAD0 | |
53 | */ | |
54 | if (rgrp->index == 0) | |
55 | defr8 |= DEFR8_DRGBS_DU(rgrp->dev->dpad0_source); | |
56 | ||
57 | rcar_du_group_write(rgrp, DEFR8, defr8); | |
58 | } | |
59 | ||
cb2025d2 LP |
60 | static void rcar_du_group_setup(struct rcar_du_group *rgrp) |
61 | { | |
62 | /* Enable extended features */ | |
63 | rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE); | |
64 | rcar_du_group_write(rgrp, DEFR2, DEFR2_CODE | DEFR2_DEFE2G); | |
65 | rcar_du_group_write(rgrp, DEFR3, DEFR3_CODE | DEFR3_DEFE3); | |
66 | rcar_du_group_write(rgrp, DEFR4, DEFR4_CODE); | |
67 | rcar_du_group_write(rgrp, DEFR5, DEFR5_CODE | DEFR5_DEFE5); | |
7cbc05cb | 68 | |
0c1c8776 LP |
69 | if (rcar_du_has(rgrp->dev, RCAR_DU_FEATURE_EXT_CTRL_REGS)) |
70 | rcar_du_group_setup_defr8(rgrp); | |
cb2025d2 LP |
71 | |
72 | /* Use DS1PR and DS2PR to configure planes priorities and connects the | |
73 | * superposition 0 to DU0 pins. DU1 pins will be configured dynamically. | |
74 | */ | |
75 | rcar_du_group_write(rgrp, DORCR, DORCR_PG1D_DS1 | DORCR_DPRS); | |
76 | } | |
77 | ||
78 | /* | |
79 | * rcar_du_group_get - Acquire a reference to the DU channels group | |
80 | * | |
81 | * Acquiring the first reference setups core registers. A reference must be held | |
82 | * before accessing any hardware registers. | |
83 | * | |
84 | * This function must be called with the DRM mode_config lock held. | |
85 | * | |
86 | * Return 0 in case of success or a negative error code otherwise. | |
87 | */ | |
88 | int rcar_du_group_get(struct rcar_du_group *rgrp) | |
89 | { | |
90 | if (rgrp->use_count) | |
91 | goto done; | |
92 | ||
93 | rcar_du_group_setup(rgrp); | |
94 | ||
95 | done: | |
96 | rgrp->use_count++; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * rcar_du_group_put - Release a reference to the DU | |
102 | * | |
103 | * This function must be called with the DRM mode_config lock held. | |
104 | */ | |
105 | void rcar_du_group_put(struct rcar_du_group *rgrp) | |
106 | { | |
107 | --rgrp->use_count; | |
108 | } | |
109 | ||
110 | static void __rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start) | |
111 | { | |
112 | rcar_du_group_write(rgrp, DSYSR, | |
113 | (rcar_du_group_read(rgrp, DSYSR) & ~(DSYSR_DRES | DSYSR_DEN)) | | |
114 | (start ? DSYSR_DEN : DSYSR_DRES)); | |
115 | } | |
116 | ||
117 | void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start) | |
118 | { | |
119 | /* Many of the configuration bits are only updated when the display | |
120 | * reset (DRES) bit in DSYSR is set to 1, disabling *both* CRTCs. Some | |
121 | * of those bits could be pre-configured, but others (especially the | |
122 | * bits related to plane assignment to display timing controllers) need | |
123 | * to be modified at runtime. | |
124 | * | |
125 | * Restart the display controller if a start is requested. Sorry for the | |
126 | * flicker. It should be possible to move most of the "DRES-update" bits | |
127 | * setup to driver initialization time and minimize the number of cases | |
128 | * when the display controller will have to be restarted. | |
129 | */ | |
130 | if (start) { | |
131 | if (rgrp->used_crtcs++ != 0) | |
132 | __rcar_du_group_start_stop(rgrp, false); | |
133 | __rcar_du_group_start_stop(rgrp, true); | |
134 | } else { | |
135 | if (--rgrp->used_crtcs == 0) | |
136 | __rcar_du_group_start_stop(rgrp, false); | |
137 | } | |
138 | } | |
139 | ||
140 | void rcar_du_group_restart(struct rcar_du_group *rgrp) | |
141 | { | |
142 | __rcar_du_group_start_stop(rgrp, false); | |
143 | __rcar_du_group_start_stop(rgrp, true); | |
144 | } | |
2fd22dba | 145 | |
7cbc05cb LP |
146 | static int rcar_du_set_dpad0_routing(struct rcar_du_device *rcdu) |
147 | { | |
148 | int ret; | |
149 | ||
0c1c8776 LP |
150 | if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_EXT_CTRL_REGS)) |
151 | return 0; | |
152 | ||
7cbc05cb LP |
153 | /* RGB output routing to DPAD0 is configured in the DEFR8 register of |
154 | * the first group. As this function can be called with the DU0 and DU1 | |
155 | * CRTCs disabled, we need to enable the first group clock before | |
156 | * accessing the register. | |
157 | */ | |
158 | ret = clk_prepare_enable(rcdu->crtcs[0].clock); | |
159 | if (ret < 0) | |
160 | return ret; | |
161 | ||
162 | rcar_du_group_setup_defr8(&rcdu->groups[0]); | |
163 | ||
164 | clk_disable_unprepare(rcdu->crtcs[0].clock); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | int rcar_du_group_set_routing(struct rcar_du_group *rgrp) | |
2fd22dba LP |
170 | { |
171 | struct rcar_du_crtc *crtc0 = &rgrp->dev->crtcs[rgrp->index * 2]; | |
172 | u32 dorcr = rcar_du_group_read(rgrp, DORCR); | |
173 | ||
174 | dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK); | |
175 | ||
ef67a902 LP |
176 | /* Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and |
177 | * CRTC 1 in all other cases to avoid cloning CRTC 0 to DPAD0 and DPAD1 | |
178 | * by default. | |
2fd22dba | 179 | */ |
ef67a902 | 180 | if (crtc0->outputs & BIT(RCAR_DU_OUTPUT_DPAD1)) |
2fd22dba LP |
181 | dorcr |= DORCR_PG2D_DS1; |
182 | else | |
183 | dorcr |= DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_DS2; | |
184 | ||
185 | rcar_du_group_write(rgrp, DORCR, dorcr); | |
7cbc05cb LP |
186 | |
187 | return rcar_du_set_dpad0_routing(rgrp->dev); | |
2fd22dba | 188 | } |