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
vsp1_lif_write(struct vsp1_lif * lif,struct vsp1_dl_body * dlb,u32 reg,u32 data)26 static 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
37 static const unsigned int lif_codes[] = {
38 MEDIA_BUS_FMT_ARGB8888_1X32,
39 MEDIA_BUS_FMT_AYUV8_1X32,
40 };
41
lif_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)42 static 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
lif_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)50 static 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
lif_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)59 static 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
69 static 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
77 static const struct v4l2_subdev_ops lif_ops = {
78 .pad = &lif_pad_ops,
79 };
80
81 /* -----------------------------------------------------------------------------
82 * VSP1 Entity Operations
83 */
84
lif_configure_stream(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_body * dlb)85 static void lif_configure_stream(struct vsp1_entity *entity,
86 struct vsp1_pipeline *pipe,
87 struct vsp1_dl_body *dlb)
88 {
89 const struct v4l2_mbus_framefmt *format;
90 struct vsp1_lif *lif = to_lif(&entity->subdev);
91 unsigned int hbth = 1300;
92 unsigned int obth = 400;
93 unsigned int lbth = 200;
94
95 format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config,
96 LIF_PAD_SOURCE);
97
98 obth = min(obth, (format->width + 1) / 2 * format->height - 4);
99
100 vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
101 (hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
102 (lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
103
104 vsp1_lif_write(lif, dlb, VI6_LIF_CTRL,
105 (obth << VI6_LIF_CTRL_OBTH_SHIFT) |
106 (format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
107 VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
108
109 /*
110 * On R-Car V3M the LIF0 buffer attribute register has to be set to a
111 * non-default value to guarantee proper operation (otherwise artifacts
112 * may appear on the output). The value required by the manual is not
113 * explained but is likely a buffer size or threshold.
114 */
115 if ((entity->vsp1->version & VI6_IP_VERSION_MASK) ==
116 (VI6_IP_VERSION_MODEL_VSPD_V3 | VI6_IP_VERSION_SOC_V3M))
117 vsp1_lif_write(lif, dlb, VI6_LIF_LBA,
118 VI6_LIF_LBA_LBA0 |
119 (1536 << VI6_LIF_LBA_LBA1_SHIFT));
120 }
121
122 static const struct vsp1_entity_operations lif_entity_ops = {
123 .configure_stream = lif_configure_stream,
124 };
125
126 /* -----------------------------------------------------------------------------
127 * Initialization and Cleanup
128 */
129
vsp1_lif_create(struct vsp1_device * vsp1,unsigned int index)130 struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index)
131 {
132 struct vsp1_lif *lif;
133 int ret;
134
135 lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
136 if (lif == NULL)
137 return ERR_PTR(-ENOMEM);
138
139 lif->entity.ops = &lif_entity_ops;
140 lif->entity.type = VSP1_ENTITY_LIF;
141 lif->entity.index = index;
142
143 /*
144 * The LIF is never exposed to userspace, but media entity registration
145 * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
146 * avoid triggering a WARN_ON(), the value won't be seen anywhere.
147 */
148 ret = vsp1_entity_init(vsp1, &lif->entity, "lif", 2, &lif_ops,
149 MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
150 if (ret < 0)
151 return ERR_PTR(ret);
152
153 return lif;
154 }
155
