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
vsp1_lut_write(struct vsp1_lut * lut,struct vsp1_dl_body * dlb,u32 reg,u32 data)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
lut_set_table(struct vsp1_lut * lut,struct v4l2_ctrl * ctrl)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
lut_s_ctrl(struct v4l2_ctrl * ctrl)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
lut_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)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
lut_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)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
lut_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)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 .init_cfg = vsp1_entity_init_cfg,
135 .enum_mbus_code = lut_enum_mbus_code,
136 .enum_frame_size = lut_enum_frame_size,
137 .get_fmt = vsp1_subdev_get_pad_format,
138 .set_fmt = lut_set_format,
139 };
140
141 static const struct v4l2_subdev_ops lut_ops = {
142 .pad = &lut_pad_ops,
143 };
144
145 /* -----------------------------------------------------------------------------
146 * VSP1 Entity Operations
147 */
148
lut_configure_stream(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)149 static void lut_configure_stream(struct vsp1_entity *entity,
150 struct vsp1_pipeline *pipe,
151 struct vsp1_dl_list *dl,
152 struct vsp1_dl_body *dlb)
153 {
154 struct vsp1_lut *lut = to_lut(&entity->subdev);
155
156 vsp1_lut_write(lut, dlb, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
157 }
158
lut_configure_frame(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)159 static void lut_configure_frame(struct vsp1_entity *entity,
160 struct vsp1_pipeline *pipe,
161 struct vsp1_dl_list *dl,
162 struct vsp1_dl_body *dlb)
163 {
164 struct vsp1_lut *lut = to_lut(&entity->subdev);
165 struct vsp1_dl_body *lut_dlb;
166 unsigned long flags;
167
168 spin_lock_irqsave(&lut->lock, flags);
169 lut_dlb = lut->lut;
170 lut->lut = NULL;
171 spin_unlock_irqrestore(&lut->lock, flags);
172
173 if (lut_dlb) {
174 vsp1_dl_list_add_body(dl, lut_dlb);
175
176 /* Release our local reference. */
177 vsp1_dl_body_put(lut_dlb);
178 }
179 }
180
lut_destroy(struct vsp1_entity * entity)181 static void lut_destroy(struct vsp1_entity *entity)
182 {
183 struct vsp1_lut *lut = to_lut(&entity->subdev);
184
185 vsp1_dl_body_pool_destroy(lut->pool);
186 }
187
188 static const struct vsp1_entity_operations lut_entity_ops = {
189 .configure_stream = lut_configure_stream,
190 .configure_frame = lut_configure_frame,
191 .destroy = lut_destroy,
192 };
193
194 /* -----------------------------------------------------------------------------
195 * Initialization and Cleanup
196 */
197
vsp1_lut_create(struct vsp1_device * vsp1)198 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
199 {
200 struct vsp1_lut *lut;
201 int ret;
202
203 lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
204 if (lut == NULL)
205 return ERR_PTR(-ENOMEM);
206
207 spin_lock_init(&lut->lock);
208
209 lut->entity.ops = &lut_entity_ops;
210 lut->entity.type = VSP1_ENTITY_LUT;
211
212 ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
213 MEDIA_ENT_F_PROC_VIDEO_LUT);
214 if (ret < 0)
215 return ERR_PTR(ret);
216
217 /*
218 * Pre-allocate a body pool, with 3 bodies allowing a userspace update
219 * before the hardware has committed a previous set of tables, handling
220 * both the queued and pending dl entries.
221 */
222 lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
223 if (!lut->pool)
224 return ERR_PTR(-ENOMEM);
225
226 /* Initialize the control handler. */
227 v4l2_ctrl_handler_init(&lut->ctrls, 1);
228 v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
229
230 lut->entity.subdev.ctrl_handler = &lut->ctrls;
231
232 if (lut->ctrls.error) {
233 dev_err(vsp1->dev, "lut: failed to initialize controls\n");
234 ret = lut->ctrls.error;
235 vsp1_entity_destroy(&lut->entity);
236 return ERR_PTR(ret);
237 }
238
239 v4l2_ctrl_handler_setup(&lut->ctrls);
240
241 return lut;
242 }
243