1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Microchip Image Sensor Controller (ISC) Scaler entity support
4 *
5 * Copyright (C) 2022 Microchip Technology, Inc.
6 *
7 * Author: Eugen Hristev <eugen.hristev@microchip.com>
8 *
9 */
10
11 #include <media/media-device.h>
12 #include <media/media-entity.h>
13 #include <media/v4l2-device.h>
14 #include <media/v4l2-subdev.h>
15
16 #include "microchip-isc-regs.h"
17 #include "microchip-isc.h"
18
isc_scaler_prepare_fmt(struct v4l2_mbus_framefmt * framefmt)19 static void isc_scaler_prepare_fmt(struct v4l2_mbus_framefmt *framefmt)
20 {
21 framefmt->colorspace = V4L2_COLORSPACE_SRGB;
22 framefmt->field = V4L2_FIELD_NONE;
23 framefmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
24 framefmt->quantization = V4L2_QUANTIZATION_DEFAULT;
25 framefmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
26 };
27
isc_scaler_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)28 static int isc_scaler_get_fmt(struct v4l2_subdev *sd,
29 struct v4l2_subdev_state *sd_state,
30 struct v4l2_subdev_format *format)
31 {
32 struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
33 struct v4l2_mbus_framefmt *v4l2_try_fmt;
34
35 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
36 v4l2_try_fmt = v4l2_subdev_get_try_format(sd, sd_state,
37 format->pad);
38 format->format = *v4l2_try_fmt;
39
40 return 0;
41 }
42
43 format->format = isc->scaler_format[format->pad];
44
45 return 0;
46 }
47
isc_scaler_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * req_fmt)48 static int isc_scaler_set_fmt(struct v4l2_subdev *sd,
49 struct v4l2_subdev_state *sd_state,
50 struct v4l2_subdev_format *req_fmt)
51 {
52 struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
53 struct v4l2_mbus_framefmt *v4l2_try_fmt;
54 struct isc_format *fmt;
55 unsigned int i;
56
57 /* Source format is fixed, we cannot change it */
58 if (req_fmt->pad == ISC_SCALER_PAD_SOURCE) {
59 req_fmt->format = isc->scaler_format[ISC_SCALER_PAD_SOURCE];
60 return 0;
61 }
62
63 /* There is no limit on the frame size on the sink pad */
64 v4l_bound_align_image(&req_fmt->format.width, 16, UINT_MAX, 0,
65 &req_fmt->format.height, 16, UINT_MAX, 0, 0);
66
67 isc_scaler_prepare_fmt(&req_fmt->format);
68
69 fmt = isc_find_format_by_code(isc, req_fmt->format.code, &i);
70
71 if (!fmt)
72 fmt = &isc->formats_list[0];
73
74 req_fmt->format.code = fmt->mbus_code;
75
76 if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
77 v4l2_try_fmt = v4l2_subdev_get_try_format(sd, sd_state,
78 req_fmt->pad);
79 *v4l2_try_fmt = req_fmt->format;
80 /* Trying on the sink pad makes the source pad change too */
81 v4l2_try_fmt = v4l2_subdev_get_try_format(sd, sd_state,
82 ISC_SCALER_PAD_SOURCE);
83 *v4l2_try_fmt = req_fmt->format;
84
85 v4l_bound_align_image(&v4l2_try_fmt->width,
86 16, isc->max_width, 0,
87 &v4l2_try_fmt->height,
88 16, isc->max_height, 0, 0);
89 /* if we are just trying, we are done */
90 return 0;
91 }
92
93 isc->scaler_format[ISC_SCALER_PAD_SINK] = req_fmt->format;
94
95 /* The source pad is the same as the sink, but we have to crop it */
96 isc->scaler_format[ISC_SCALER_PAD_SOURCE] =
97 isc->scaler_format[ISC_SCALER_PAD_SINK];
98 v4l_bound_align_image
99 (&isc->scaler_format[ISC_SCALER_PAD_SOURCE].width, 16,
100 isc->max_width, 0,
101 &isc->scaler_format[ISC_SCALER_PAD_SOURCE].height, 16,
102 isc->max_height, 0, 0);
103
104 return 0;
105 }
106
isc_scaler_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)107 static int isc_scaler_enum_mbus_code(struct v4l2_subdev *sd,
108 struct v4l2_subdev_state *sd_state,
109 struct v4l2_subdev_mbus_code_enum *code)
110 {
111 struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
112
113 /*
114 * All formats supported by the ISC are supported by the scaler.
115 * Advertise the formats which the ISC can take as input, as the scaler
116 * entity cropping is part of the PFE module (parallel front end)
117 */
118 if (code->index < isc->formats_list_size) {
119 code->code = isc->formats_list[code->index].mbus_code;
120 return 0;
121 }
122
123 return -EINVAL;
124 }
125
isc_scaler_g_sel(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)126 static int isc_scaler_g_sel(struct v4l2_subdev *sd,
127 struct v4l2_subdev_state *sd_state,
128 struct v4l2_subdev_selection *sel)
129 {
130 struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
131
132 if (sel->pad == ISC_SCALER_PAD_SOURCE)
133 return -EINVAL;
134
135 if (sel->target != V4L2_SEL_TGT_CROP_BOUNDS &&
136 sel->target != V4L2_SEL_TGT_CROP)
137 return -EINVAL;
138
139 sel->r.height = isc->scaler_format[ISC_SCALER_PAD_SOURCE].height;
140 sel->r.width = isc->scaler_format[ISC_SCALER_PAD_SOURCE].width;
141
142 sel->r.left = 0;
143 sel->r.top = 0;
144
145 return 0;
146 }
147
isc_scaler_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)148 static int isc_scaler_init_cfg(struct v4l2_subdev *sd,
149 struct v4l2_subdev_state *sd_state)
150 {
151 struct v4l2_mbus_framefmt *v4l2_try_fmt =
152 v4l2_subdev_get_try_format(sd, sd_state, 0);
153 struct v4l2_rect *try_crop;
154 struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
155
156 *v4l2_try_fmt = isc->scaler_format[ISC_SCALER_PAD_SOURCE];
157
158 try_crop = v4l2_subdev_get_try_crop(sd, sd_state, 0);
159
160 try_crop->top = 0;
161 try_crop->left = 0;
162 try_crop->width = v4l2_try_fmt->width;
163 try_crop->height = v4l2_try_fmt->height;
164
165 return 0;
166 }
167
168 static const struct v4l2_subdev_pad_ops isc_scaler_pad_ops = {
169 .enum_mbus_code = isc_scaler_enum_mbus_code,
170 .set_fmt = isc_scaler_set_fmt,
171 .get_fmt = isc_scaler_get_fmt,
172 .get_selection = isc_scaler_g_sel,
173 .init_cfg = isc_scaler_init_cfg,
174 };
175
176 static const struct media_entity_operations isc_scaler_entity_ops = {
177 .link_validate = v4l2_subdev_link_validate,
178 };
179
180 static const struct v4l2_subdev_ops xisc_scaler_subdev_ops = {
181 .pad = &isc_scaler_pad_ops,
182 };
183
isc_scaler_init(struct isc_device * isc)184 int isc_scaler_init(struct isc_device *isc)
185 {
186 int ret;
187
188 v4l2_subdev_init(&isc->scaler_sd, &xisc_scaler_subdev_ops);
189
190 isc->scaler_sd.owner = THIS_MODULE;
191 isc->scaler_sd.dev = isc->dev;
192 snprintf(isc->scaler_sd.name, sizeof(isc->scaler_sd.name),
193 "microchip_isc_scaler");
194
195 isc->scaler_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
196 isc->scaler_sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
197 isc->scaler_sd.entity.ops = &isc_scaler_entity_ops;
198 isc->scaler_pads[ISC_SCALER_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
199 isc->scaler_pads[ISC_SCALER_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
200
201 isc_scaler_prepare_fmt(&isc->scaler_format[ISC_SCALER_PAD_SOURCE]);
202 isc->scaler_format[ISC_SCALER_PAD_SOURCE].height = isc->max_height;
203 isc->scaler_format[ISC_SCALER_PAD_SOURCE].width = isc->max_width;
204 isc->scaler_format[ISC_SCALER_PAD_SOURCE].code =
205 isc->formats_list[0].mbus_code;
206
207 isc->scaler_format[ISC_SCALER_PAD_SINK] =
208 isc->scaler_format[ISC_SCALER_PAD_SOURCE];
209
210 ret = media_entity_pads_init(&isc->scaler_sd.entity,
211 ISC_SCALER_PADS_NUM,
212 isc->scaler_pads);
213 if (ret < 0) {
214 dev_err(isc->dev, "scaler sd media entity init failed\n");
215 return ret;
216 }
217
218 ret = v4l2_device_register_subdev(&isc->v4l2_dev, &isc->scaler_sd);
219 if (ret < 0) {
220 dev_err(isc->dev, "scaler sd failed to register subdev\n");
221 return ret;
222 }
223
224 return ret;
225 }
226 EXPORT_SYMBOL_GPL(isc_scaler_init);
227
isc_scaler_link(struct isc_device * isc)228 int isc_scaler_link(struct isc_device *isc)
229 {
230 int ret;
231
232 ret = media_create_pad_link(&isc->current_subdev->sd->entity,
233 isc->remote_pad, &isc->scaler_sd.entity,
234 ISC_SCALER_PAD_SINK,
235 MEDIA_LNK_FL_ENABLED |
236 MEDIA_LNK_FL_IMMUTABLE);
237
238 if (ret < 0) {
239 dev_err(isc->dev, "Failed to create pad link: %s to %s\n",
240 isc->current_subdev->sd->entity.name,
241 isc->scaler_sd.entity.name);
242 return ret;
243 }
244
245 dev_dbg(isc->dev, "link with %s pad: %d\n",
246 isc->current_subdev->sd->name, isc->remote_pad);
247
248 ret = media_create_pad_link(&isc->scaler_sd.entity,
249 ISC_SCALER_PAD_SOURCE,
250 &isc->video_dev.entity, ISC_PAD_SINK,
251 MEDIA_LNK_FL_ENABLED |
252 MEDIA_LNK_FL_IMMUTABLE);
253
254 if (ret < 0) {
255 dev_err(isc->dev, "Failed to create pad link: %s to %s\n",
256 isc->scaler_sd.entity.name,
257 isc->video_dev.entity.name);
258 return ret;
259 }
260
261 dev_dbg(isc->dev, "link with %s pad: %d\n", isc->scaler_sd.name,
262 ISC_SCALER_PAD_SOURCE);
263
264 return ret;
265 }
266 EXPORT_SYMBOL_GPL(isc_scaler_link);
267
268