xref: /linux/drivers/media/platform/renesas/vsp1/vsp1_lut.c (revision 9a95c5bfbf02a0a7f5983280fe284a0ff0836c34)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * vsp1_lut.c  --  R-Car VSP1 Look-Up Table
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_lut.h"
18 
19 #define LUT_MIN_SIZE				4U
20 #define LUT_MAX_SIZE				8190U
21 
22 #define LUT_SIZE				256
23 
24 /* -----------------------------------------------------------------------------
25  * Device Access
26  */
27 
28 static inline void vsp1_lut_write(struct vsp1_lut *lut,
29 				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
30 {
31 	vsp1_dl_body_write(dlb, reg, data);
32 }
33 
34 /* -----------------------------------------------------------------------------
35  * Controls
36  */
37 
38 #define V4L2_CID_VSP1_LUT_TABLE			(V4L2_CID_USER_BASE | 0x1001)
39 
40 static int lut_set_table(struct vsp1_lut *lut, struct v4l2_ctrl *ctrl)
41 {
42 	struct vsp1_dl_body *dlb;
43 	unsigned int i;
44 
45 	dlb = vsp1_dl_body_get(lut->pool);
46 	if (!dlb)
47 		return -ENOMEM;
48 
49 	for (i = 0; i < LUT_SIZE; ++i)
50 		vsp1_dl_body_write(dlb, VI6_LUT_TABLE + 4 * i,
51 				       ctrl->p_new.p_u32[i]);
52 
53 	spin_lock_irq(&lut->lock);
54 	swap(lut->lut, dlb);
55 	spin_unlock_irq(&lut->lock);
56 
57 	vsp1_dl_body_put(dlb);
58 	return 0;
59 }
60 
61 static int lut_s_ctrl(struct v4l2_ctrl *ctrl)
62 {
63 	struct vsp1_lut *lut =
64 		container_of(ctrl->handler, struct vsp1_lut, ctrls);
65 
66 	switch (ctrl->id) {
67 	case V4L2_CID_VSP1_LUT_TABLE:
68 		lut_set_table(lut, ctrl);
69 		break;
70 	}
71 
72 	return 0;
73 }
74 
75 static const struct v4l2_ctrl_ops lut_ctrl_ops = {
76 	.s_ctrl = lut_s_ctrl,
77 };
78 
79 static const struct v4l2_ctrl_config lut_table_control = {
80 	.ops = &lut_ctrl_ops,
81 	.id = V4L2_CID_VSP1_LUT_TABLE,
82 	.name = "Look-Up Table",
83 	.type = V4L2_CTRL_TYPE_U32,
84 	.min = 0x00000000,
85 	.max = 0x00ffffff,
86 	.step = 1,
87 	.def = 0,
88 	.dims = { LUT_SIZE },
89 };
90 
91 /* -----------------------------------------------------------------------------
92  * V4L2 Subdevice Pad Operations
93  */
94 
95 static const unsigned int lut_codes[] = {
96 	MEDIA_BUS_FMT_ARGB8888_1X32,
97 	MEDIA_BUS_FMT_AHSV8888_1X32,
98 	MEDIA_BUS_FMT_AYUV8_1X32,
99 };
100 
101 static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
102 			      struct v4l2_subdev_state *sd_state,
103 			      struct v4l2_subdev_mbus_code_enum *code)
104 {
105 	return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, lut_codes,
106 					  ARRAY_SIZE(lut_codes));
107 }
108 
109 static int lut_enum_frame_size(struct v4l2_subdev *subdev,
110 			       struct v4l2_subdev_state *sd_state,
111 			       struct v4l2_subdev_frame_size_enum *fse)
112 {
113 	return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
114 					   LUT_MIN_SIZE,
115 					   LUT_MIN_SIZE, LUT_MAX_SIZE,
116 					   LUT_MAX_SIZE);
117 }
118 
119 static int lut_set_format(struct v4l2_subdev *subdev,
120 			  struct v4l2_subdev_state *sd_state,
121 			  struct v4l2_subdev_format *fmt)
122 {
123 	return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, lut_codes,
124 					  ARRAY_SIZE(lut_codes),
125 					  LUT_MIN_SIZE, LUT_MIN_SIZE,
126 					  LUT_MAX_SIZE, LUT_MAX_SIZE);
127 }
128 
129 /* -----------------------------------------------------------------------------
130  * V4L2 Subdevice Operations
131  */
132 
133 static const struct v4l2_subdev_pad_ops lut_pad_ops = {
134 	.enum_mbus_code = lut_enum_mbus_code,
135 	.enum_frame_size = lut_enum_frame_size,
136 	.get_fmt = vsp1_subdev_get_pad_format,
137 	.set_fmt = lut_set_format,
138 };
139 
140 static const struct v4l2_subdev_ops lut_ops = {
141 	.pad    = &lut_pad_ops,
142 };
143 
144 /* -----------------------------------------------------------------------------
145  * VSP1 Entity Operations
146  */
147 
148 static void lut_configure_stream(struct vsp1_entity *entity,
149 				 struct vsp1_pipeline *pipe,
150 				 struct vsp1_dl_list *dl,
151 				 struct vsp1_dl_body *dlb)
152 {
153 	struct vsp1_lut *lut = to_lut(&entity->subdev);
154 
155 	vsp1_lut_write(lut, dlb, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
156 }
157 
158 static void lut_configure_frame(struct vsp1_entity *entity,
159 				struct vsp1_pipeline *pipe,
160 				struct vsp1_dl_list *dl,
161 				struct vsp1_dl_body *dlb)
162 {
163 	struct vsp1_lut *lut = to_lut(&entity->subdev);
164 	struct vsp1_dl_body *lut_dlb;
165 	unsigned long flags;
166 
167 	spin_lock_irqsave(&lut->lock, flags);
168 	lut_dlb = lut->lut;
169 	lut->lut = NULL;
170 	spin_unlock_irqrestore(&lut->lock, flags);
171 
172 	if (lut_dlb) {
173 		vsp1_dl_list_add_body(dl, lut_dlb);
174 
175 		/* Release our local reference. */
176 		vsp1_dl_body_put(lut_dlb);
177 	}
178 }
179 
180 static void lut_destroy(struct vsp1_entity *entity)
181 {
182 	struct vsp1_lut *lut = to_lut(&entity->subdev);
183 
184 	vsp1_dl_body_pool_destroy(lut->pool);
185 }
186 
187 static const struct vsp1_entity_operations lut_entity_ops = {
188 	.configure_stream = lut_configure_stream,
189 	.configure_frame = lut_configure_frame,
190 	.destroy = lut_destroy,
191 };
192 
193 /* -----------------------------------------------------------------------------
194  * Initialization and Cleanup
195  */
196 
197 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
198 {
199 	struct vsp1_lut *lut;
200 	int ret;
201 
202 	lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
203 	if (lut == NULL)
204 		return ERR_PTR(-ENOMEM);
205 
206 	spin_lock_init(&lut->lock);
207 
208 	lut->entity.ops = &lut_entity_ops;
209 	lut->entity.type = VSP1_ENTITY_LUT;
210 
211 	ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
212 			       MEDIA_ENT_F_PROC_VIDEO_LUT);
213 	if (ret < 0)
214 		return ERR_PTR(ret);
215 
216 	/*
217 	 * Pre-allocate a body pool, with 3 bodies allowing a userspace update
218 	 * before the hardware has committed a previous set of tables, handling
219 	 * both the queued and pending dl entries.
220 	 */
221 	lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
222 	if (!lut->pool)
223 		return ERR_PTR(-ENOMEM);
224 
225 	/* Initialize the control handler. */
226 	v4l2_ctrl_handler_init(&lut->ctrls, 1);
227 	v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
228 
229 	lut->entity.subdev.ctrl_handler = &lut->ctrls;
230 
231 	if (lut->ctrls.error) {
232 		dev_err(vsp1->dev, "lut: failed to initialize controls\n");
233 		ret = lut->ctrls.error;
234 		vsp1_entity_destroy(&lut->entity);
235 		return ERR_PTR(ret);
236 	}
237 
238 	v4l2_ctrl_handler_setup(&lut->ctrls);
239 
240 	return lut;
241 }
242