1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
4 *
5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
6 *
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10#include <linux/device.h>
11#include <linux/gfp.h>
12
13#include <media/v4l2-subdev.h>
14
15#include "vsp1.h"
16#include "vsp1_dl.h"
17#include "vsp1_lif.h"
18
19#define LIF_MIN_SIZE				2U
20#define LIF_MAX_SIZE				8190U
21
22/* -----------------------------------------------------------------------------
23 * Device Access
24 */
25
26static inline void vsp1_lif_write(struct vsp1_lif *lif,
27				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
28{
29	vsp1_dl_body_write(dlb, reg + lif->entity.index * VI6_LIF_OFFSET,
30			       data);
31}
32
33/* -----------------------------------------------------------------------------
34 * V4L2 Subdevice Operations
35 */
36
37static const unsigned int lif_codes[] = {
38	MEDIA_BUS_FMT_ARGB8888_1X32,
39	MEDIA_BUS_FMT_AYUV8_1X32,
40};
41
42static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
43			      struct v4l2_subdev_pad_config *cfg,
44			      struct v4l2_subdev_mbus_code_enum *code)
45{
46	return vsp1_subdev_enum_mbus_code(subdev, cfg, code, lif_codes,
47					  ARRAY_SIZE(lif_codes));
48}
49
50static int lif_enum_frame_size(struct v4l2_subdev *subdev,
51			       struct v4l2_subdev_pad_config *cfg,
52			       struct v4l2_subdev_frame_size_enum *fse)
53{
54	return vsp1_subdev_enum_frame_size(subdev, cfg, fse, LIF_MIN_SIZE,
55					   LIF_MIN_SIZE, LIF_MAX_SIZE,
56					   LIF_MAX_SIZE);
57}
58
59static int lif_set_format(struct v4l2_subdev *subdev,
60			  struct v4l2_subdev_pad_config *cfg,
61			  struct v4l2_subdev_format *fmt)
62{
63	return vsp1_subdev_set_pad_format(subdev, cfg, fmt, lif_codes,
64					  ARRAY_SIZE(lif_codes),
65					  LIF_MIN_SIZE, LIF_MIN_SIZE,
66					  LIF_MAX_SIZE, LIF_MAX_SIZE);
67}
68
69static const struct v4l2_subdev_pad_ops lif_pad_ops = {
70	.init_cfg = vsp1_entity_init_cfg,
71	.enum_mbus_code = lif_enum_mbus_code,
72	.enum_frame_size = lif_enum_frame_size,
73	.get_fmt = vsp1_subdev_get_pad_format,
74	.set_fmt = lif_set_format,
75};
76
77static const struct v4l2_subdev_ops lif_ops = {
78	.pad    = &lif_pad_ops,
79};
80
81/* -----------------------------------------------------------------------------
82 * VSP1 Entity Operations
83 */
84
85static void lif_configure_stream(struct vsp1_entity *entity,
86				 struct vsp1_pipeline *pipe,
87				 struct vsp1_dl_list *dl,
88				 struct vsp1_dl_body *dlb)
89{
90	const struct v4l2_mbus_framefmt *format;
91	struct vsp1_lif *lif = to_lif(&entity->subdev);
92	unsigned int hbth;
93	unsigned int obth;
94	unsigned int lbth;
95
96	format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config,
97					    LIF_PAD_SOURCE);
98
99	switch (entity->vsp1->version & VI6_IP_VERSION_MODEL_MASK) {
100	case VI6_IP_VERSION_MODEL_VSPD_GEN2:
101	case VI6_IP_VERSION_MODEL_VSPD_V2H:
102		hbth = 1536;
103		obth = min(128U, (format->width + 1) / 2 * format->height - 4);
104		lbth = 1520;
105		break;
106
107	case VI6_IP_VERSION_MODEL_VSPDL_GEN3:
108	case VI6_IP_VERSION_MODEL_VSPD_V3:
109		hbth = 0;
110		obth = 1500;
111		lbth = 0;
112		break;
113
114	case VI6_IP_VERSION_MODEL_VSPD_GEN3:
115	default:
116		hbth = 0;
117		obth = 3000;
118		lbth = 0;
119		break;
120	}
121
122	vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
123			(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
124			(lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
125
126	vsp1_lif_write(lif, dlb, VI6_LIF_CTRL,
127			(obth << VI6_LIF_CTRL_OBTH_SHIFT) |
128			(format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
129			VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
130
131	/*
132	 * On R-Car V3M the LIF0 buffer attribute register has to be set to a
133	 * non-default value to guarantee proper operation (otherwise artifacts
134	 * may appear on the output). The value required by the manual is not
135	 * explained but is likely a buffer size or threshold.
136	 */
137	if ((entity->vsp1->version & VI6_IP_VERSION_MASK) ==
138	    (VI6_IP_VERSION_MODEL_VSPD_V3 | VI6_IP_VERSION_SOC_V3M))
139		vsp1_lif_write(lif, dlb, VI6_LIF_LBA,
140			       VI6_LIF_LBA_LBA0 |
141			       (1536 << VI6_LIF_LBA_LBA1_SHIFT));
142}
143
144static const struct vsp1_entity_operations lif_entity_ops = {
145	.configure_stream = lif_configure_stream,
146};
147
148/* -----------------------------------------------------------------------------
149 * Initialization and Cleanup
150 */
151
152struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index)
153{
154	struct vsp1_lif *lif;
155	int ret;
156
157	lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
158	if (lif == NULL)
159		return ERR_PTR(-ENOMEM);
160
161	lif->entity.ops = &lif_entity_ops;
162	lif->entity.type = VSP1_ENTITY_LIF;
163	lif->entity.index = index;
164
165	/*
166	 * The LIF is never exposed to userspace, but media entity registration
167	 * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
168	 * avoid triggering a WARN_ON(), the value won't be seen anywhere.
169	 */
170	ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops,
171			       MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
172	if (ret < 0)
173		return ERR_PTR(ret);
174
175	return lif;
176}
177