1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * vsp1_hsit.c  --  R-Car VSP1 Hue Saturation value (Inverse) Transform
4  *
5  * Copyright (C) 2013 Renesas 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_hsit.h"
18 
19 #define HSIT_MIN_SIZE				4U
20 #define HSIT_MAX_SIZE				8190U
21 
22 /* -----------------------------------------------------------------------------
23  * Device Access
24  */
25 
26 static inline void vsp1_hsit_write(struct vsp1_hsit *hsit,
27 				   struct vsp1_dl_body *dlb, u32 reg, u32 data)
28 {
29 	vsp1_dl_body_write(dlb, reg, data);
30 }
31 
32 /* -----------------------------------------------------------------------------
33  * V4L2 Subdevice Operations
34  */
35 
36 static int hsit_enum_mbus_code(struct v4l2_subdev *subdev,
37 			       struct v4l2_subdev_state *sd_state,
38 			       struct v4l2_subdev_mbus_code_enum *code)
39 {
40 	struct vsp1_hsit *hsit = to_hsit(subdev);
41 
42 	if (code->index > 0)
43 		return -EINVAL;
44 
45 	if ((code->pad == HSIT_PAD_SINK && !hsit->inverse) |
46 	    (code->pad == HSIT_PAD_SOURCE && hsit->inverse))
47 		code->code = MEDIA_BUS_FMT_ARGB8888_1X32;
48 	else
49 		code->code = MEDIA_BUS_FMT_AHSV8888_1X32;
50 
51 	return 0;
52 }
53 
54 static int hsit_enum_frame_size(struct v4l2_subdev *subdev,
55 				struct v4l2_subdev_state *sd_state,
56 				struct v4l2_subdev_frame_size_enum *fse)
57 {
58 	return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
59 					   HSIT_MIN_SIZE,
60 					   HSIT_MIN_SIZE, HSIT_MAX_SIZE,
61 					   HSIT_MAX_SIZE);
62 }
63 
64 static int hsit_set_format(struct v4l2_subdev *subdev,
65 			   struct v4l2_subdev_state *sd_state,
66 			   struct v4l2_subdev_format *fmt)
67 {
68 	struct vsp1_hsit *hsit = to_hsit(subdev);
69 	struct v4l2_subdev_state *state;
70 	struct v4l2_mbus_framefmt *format;
71 	int ret = 0;
72 
73 	mutex_lock(&hsit->entity.lock);
74 
75 	state = vsp1_entity_get_state(&hsit->entity, sd_state, fmt->which);
76 	if (!state) {
77 		ret = -EINVAL;
78 		goto done;
79 	}
80 
81 	format = vsp1_entity_get_pad_format(&hsit->entity, state, fmt->pad);
82 
83 	if (fmt->pad == HSIT_PAD_SOURCE) {
84 		/*
85 		 * The HST and HSI output format code and resolution can't be
86 		 * modified.
87 		 */
88 		fmt->format = *format;
89 		goto done;
90 	}
91 
92 	format->code = hsit->inverse ? MEDIA_BUS_FMT_AHSV8888_1X32
93 		     : MEDIA_BUS_FMT_ARGB8888_1X32;
94 	format->width = clamp_t(unsigned int, fmt->format.width,
95 				HSIT_MIN_SIZE, HSIT_MAX_SIZE);
96 	format->height = clamp_t(unsigned int, fmt->format.height,
97 				 HSIT_MIN_SIZE, HSIT_MAX_SIZE);
98 	format->field = V4L2_FIELD_NONE;
99 	format->colorspace = V4L2_COLORSPACE_SRGB;
100 
101 	fmt->format = *format;
102 
103 	/* Propagate the format to the source pad. */
104 	format = vsp1_entity_get_pad_format(&hsit->entity, state,
105 					    HSIT_PAD_SOURCE);
106 	*format = fmt->format;
107 	format->code = hsit->inverse ? MEDIA_BUS_FMT_ARGB8888_1X32
108 		     : MEDIA_BUS_FMT_AHSV8888_1X32;
109 
110 done:
111 	mutex_unlock(&hsit->entity.lock);
112 	return ret;
113 }
114 
115 static const struct v4l2_subdev_pad_ops hsit_pad_ops = {
116 	.enum_mbus_code = hsit_enum_mbus_code,
117 	.enum_frame_size = hsit_enum_frame_size,
118 	.get_fmt = vsp1_subdev_get_pad_format,
119 	.set_fmt = hsit_set_format,
120 };
121 
122 static const struct v4l2_subdev_ops hsit_ops = {
123 	.pad    = &hsit_pad_ops,
124 };
125 
126 /* -----------------------------------------------------------------------------
127  * VSP1 Entity Operations
128  */
129 
130 static void hsit_configure_stream(struct vsp1_entity *entity,
131 				  struct vsp1_pipeline *pipe,
132 				  struct vsp1_dl_list *dl,
133 				  struct vsp1_dl_body *dlb)
134 {
135 	struct vsp1_hsit *hsit = to_hsit(&entity->subdev);
136 
137 	if (hsit->inverse)
138 		vsp1_hsit_write(hsit, dlb, VI6_HSI_CTRL, VI6_HSI_CTRL_EN);
139 	else
140 		vsp1_hsit_write(hsit, dlb, VI6_HST_CTRL, VI6_HST_CTRL_EN);
141 }
142 
143 static const struct vsp1_entity_operations hsit_entity_ops = {
144 	.configure_stream = hsit_configure_stream,
145 };
146 
147 /* -----------------------------------------------------------------------------
148  * Initialization and Cleanup
149  */
150 
151 struct vsp1_hsit *vsp1_hsit_create(struct vsp1_device *vsp1, bool inverse)
152 {
153 	struct vsp1_hsit *hsit;
154 	int ret;
155 
156 	hsit = devm_kzalloc(vsp1->dev, sizeof(*hsit), GFP_KERNEL);
157 	if (hsit == NULL)
158 		return ERR_PTR(-ENOMEM);
159 
160 	hsit->inverse = inverse;
161 
162 	hsit->entity.ops = &hsit_entity_ops;
163 
164 	if (inverse)
165 		hsit->entity.type = VSP1_ENTITY_HSI;
166 	else
167 		hsit->entity.type = VSP1_ENTITY_HST;
168 
169 	ret = vsp1_entity_init(vsp1, &hsit->entity, inverse ? "hsi" : "hst",
170 			       2, &hsit_ops,
171 			       MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV);
172 	if (ret < 0)
173 		return ERR_PTR(ret);
174 
175 	return hsit;
176 }
177