1 // SPDX-License-Identifier: GPL-2.0-only
3 * i.MX8 ISI - Input crossbar switch
5 * Copyright (c) 2022 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
8 #include <linux/device.h>
9 #include <linux/errno.h>
10 #include <linux/kernel.h>
11 #include <linux/minmax.h>
12 #include <linux/regmap.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
17 #include <media/media-entity.h>
18 #include <media/v4l2-subdev.h>
20 #include "imx8-isi-core.h"
22 static inline struct mxc_isi_crossbar *to_isi_crossbar(struct v4l2_subdev *sd)
24 return container_of(sd, struct mxc_isi_crossbar, sd);
27 static int mxc_isi_crossbar_gasket_enable(struct mxc_isi_crossbar *xbar,
28 struct v4l2_subdev_state *state,
29 struct v4l2_subdev *remote_sd,
30 u32 remote_pad, unsigned int port)
32 struct mxc_isi_dev *isi = xbar->isi;
33 const struct mxc_gasket_ops *gasket_ops = isi->pdata->gasket_ops;
34 const struct v4l2_mbus_framefmt *fmt;
35 struct v4l2_mbus_frame_desc fd;
42 * Configure and enable the gasket with the frame size and CSI-2 data
43 * type. For YUV422 8-bit, enable dual component mode unconditionally,
44 * to match the configuration of the CSIS.
47 ret = v4l2_subdev_call(remote_sd, pad, get_frame_desc, remote_pad, &fd);
50 "failed to get frame descriptor from '%s':%u: %d\n",
51 remote_sd->name, remote_pad, ret);
55 if (fd.num_entries != 1) {
56 dev_err(isi->dev, "invalid frame descriptor for '%s':%u\n",
57 remote_sd->name, remote_pad);
61 fmt = v4l2_subdev_state_get_format(state, port, 0);
65 gasket_ops->enable(isi, &fd, fmt, port);
69 static void mxc_isi_crossbar_gasket_disable(struct mxc_isi_crossbar *xbar,
72 struct mxc_isi_dev *isi = xbar->isi;
73 const struct mxc_gasket_ops *gasket_ops = isi->pdata->gasket_ops;
78 gasket_ops->disable(isi, port);
81 /* -----------------------------------------------------------------------------
82 * V4L2 subdev operations
85 static const struct v4l2_mbus_framefmt mxc_isi_crossbar_default_format = {
86 .code = MXC_ISI_DEF_MBUS_CODE_SINK,
87 .width = MXC_ISI_DEF_WIDTH,
88 .height = MXC_ISI_DEF_HEIGHT,
89 .field = V4L2_FIELD_NONE,
90 .colorspace = MXC_ISI_DEF_COLOR_SPACE,
91 .ycbcr_enc = MXC_ISI_DEF_YCBCR_ENC,
92 .quantization = MXC_ISI_DEF_QUANTIZATION,
93 .xfer_func = MXC_ISI_DEF_XFER_FUNC,
96 static int __mxc_isi_crossbar_set_routing(struct v4l2_subdev *sd,
97 struct v4l2_subdev_state *state,
98 struct v4l2_subdev_krouting *routing)
100 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
101 struct v4l2_subdev_route *route;
104 ret = v4l2_subdev_routing_validate(sd, routing,
105 V4L2_SUBDEV_ROUTING_NO_N_TO_1);
109 /* The memory input can be routed to the first pipeline only. */
110 for_each_active_route(&state->routing, route) {
111 if (route->sink_pad == xbar->num_sinks - 1 &&
112 route->source_pad != xbar->num_sinks) {
113 dev_dbg(xbar->isi->dev,
114 "invalid route from memory input (%u) to pipe %u\n",
116 route->source_pad - xbar->num_sinks);
121 return v4l2_subdev_set_routing_with_fmt(sd, state, routing,
122 &mxc_isi_crossbar_default_format);
125 static struct v4l2_subdev *
126 mxc_isi_crossbar_xlate_streams(struct mxc_isi_crossbar *xbar,
127 struct v4l2_subdev_state *state,
128 u32 source_pad, u64 source_streams,
129 u32 *__sink_pad, u64 *__sink_streams,
132 struct v4l2_subdev_route *route;
133 struct v4l2_subdev *sd;
134 struct media_pad *pad;
135 u64 sink_streams = 0;
139 * Translate the source pad and streams to the sink side. The routing
140 * validation forbids stream merging, so all matching entries in the
141 * routing table are guaranteed to have the same sink pad.
143 * TODO: This is likely worth a helper function, it could perhaps be
144 * supported by v4l2_subdev_state_xlate_streams() with pad1 set to -1.
146 for_each_active_route(&state->routing, route) {
147 if (route->source_pad != source_pad ||
148 !(source_streams & BIT(route->source_stream)))
151 sink_streams |= BIT(route->sink_stream);
152 sink_pad = route->sink_pad;
156 dev_dbg(xbar->isi->dev,
157 "no stream connected to pipeline %u\n",
158 source_pad - xbar->num_sinks);
159 return ERR_PTR(-EPIPE);
162 pad = media_pad_remote_pad_first(&xbar->pads[sink_pad]);
163 sd = media_entity_to_v4l2_subdev(pad->entity);
166 dev_dbg(xbar->isi->dev,
167 "no entity connected to crossbar input %u\n",
169 return ERR_PTR(-EPIPE);
172 *__sink_pad = sink_pad;
173 *__sink_streams = sink_streams;
174 *remote_pad = pad->index;
179 static int mxc_isi_crossbar_init_state(struct v4l2_subdev *sd,
180 struct v4l2_subdev_state *state)
182 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
183 struct v4l2_subdev_krouting routing = { };
184 struct v4l2_subdev_route *routes;
189 * Create a 1:1 mapping between pixel link inputs and outputs to
190 * pipelines by default.
192 routes = kcalloc(xbar->num_sources, sizeof(*routes), GFP_KERNEL);
196 for (i = 0; i < xbar->num_sources; ++i) {
197 struct v4l2_subdev_route *route = &routes[i];
200 route->source_pad = i + xbar->num_sinks;
201 route->flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE;
204 routing.num_routes = xbar->num_sources;
205 routing.routes = routes;
207 ret = __mxc_isi_crossbar_set_routing(sd, state, &routing);
214 static int mxc_isi_crossbar_enum_mbus_code(struct v4l2_subdev *sd,
215 struct v4l2_subdev_state *state,
216 struct v4l2_subdev_mbus_code_enum *code)
218 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
219 const struct mxc_isi_bus_format_info *info;
221 if (code->pad >= xbar->num_sinks) {
222 const struct v4l2_mbus_framefmt *format;
225 * The media bus code on source pads is identical to the
226 * connected sink pad.
231 format = v4l2_subdev_state_get_opposite_stream_format(state,
237 code->code = format->code;
242 info = mxc_isi_bus_format_by_index(code->index, MXC_ISI_PIPE_PAD_SINK);
246 code->code = info->mbus_code;
251 static int mxc_isi_crossbar_set_fmt(struct v4l2_subdev *sd,
252 struct v4l2_subdev_state *state,
253 struct v4l2_subdev_format *fmt)
255 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
256 struct v4l2_mbus_framefmt *sink_fmt;
257 struct v4l2_subdev_route *route;
259 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
260 media_pad_is_streaming(&xbar->pads[fmt->pad]))
264 * The source pad format is always identical to the sink pad format and
267 if (fmt->pad >= xbar->num_sinks)
268 return v4l2_subdev_get_fmt(sd, state, fmt);
270 /* Validate the requested format. */
271 if (!mxc_isi_bus_format_by_code(fmt->format.code, MXC_ISI_PIPE_PAD_SINK))
272 fmt->format.code = MXC_ISI_DEF_MBUS_CODE_SINK;
274 fmt->format.width = clamp_t(unsigned int, fmt->format.width,
275 MXC_ISI_MIN_WIDTH, MXC_ISI_MAX_WIDTH_CHAINED);
276 fmt->format.height = clamp_t(unsigned int, fmt->format.height,
277 MXC_ISI_MIN_HEIGHT, MXC_ISI_MAX_HEIGHT);
278 fmt->format.field = V4L2_FIELD_NONE;
281 * Set the format on the sink stream and propagate it to the source
284 sink_fmt = v4l2_subdev_state_get_format(state, fmt->pad, fmt->stream);
288 *sink_fmt = fmt->format;
290 /* TODO: A format propagation helper would be useful. */
291 for_each_active_route(&state->routing, route) {
292 struct v4l2_mbus_framefmt *source_fmt;
294 if (route->sink_pad != fmt->pad ||
295 route->sink_stream != fmt->stream)
298 source_fmt = v4l2_subdev_state_get_format(state,
300 route->source_stream);
304 *source_fmt = fmt->format;
310 static int mxc_isi_crossbar_set_routing(struct v4l2_subdev *sd,
311 struct v4l2_subdev_state *state,
312 enum v4l2_subdev_format_whence which,
313 struct v4l2_subdev_krouting *routing)
315 if (which == V4L2_SUBDEV_FORMAT_ACTIVE &&
316 media_entity_is_streaming(&sd->entity))
319 return __mxc_isi_crossbar_set_routing(sd, state, routing);
322 static int mxc_isi_crossbar_enable_streams(struct v4l2_subdev *sd,
323 struct v4l2_subdev_state *state,
324 u32 pad, u64 streams_mask)
326 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
327 struct v4l2_subdev *remote_sd;
328 struct mxc_isi_input *input;
334 remote_sd = mxc_isi_crossbar_xlate_streams(xbar, state, pad, streams_mask,
335 &sink_pad, &sink_streams,
337 if (IS_ERR(remote_sd))
338 return PTR_ERR(remote_sd);
340 input = &xbar->inputs[sink_pad];
343 * TODO: Track per-stream enable counts to support multiplexed
346 if (!input->enable_count) {
347 ret = mxc_isi_crossbar_gasket_enable(xbar, state, remote_sd,
348 remote_pad, sink_pad);
352 ret = v4l2_subdev_enable_streams(remote_sd, remote_pad,
355 dev_err(xbar->isi->dev,
356 "failed to %s streams 0x%llx on '%s':%u: %d\n",
357 "enable", sink_streams, remote_sd->name,
359 mxc_isi_crossbar_gasket_disable(xbar, sink_pad);
364 input->enable_count++;
369 static int mxc_isi_crossbar_disable_streams(struct v4l2_subdev *sd,
370 struct v4l2_subdev_state *state,
371 u32 pad, u64 streams_mask)
373 struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
374 struct v4l2_subdev *remote_sd;
375 struct mxc_isi_input *input;
381 remote_sd = mxc_isi_crossbar_xlate_streams(xbar, state, pad, streams_mask,
382 &sink_pad, &sink_streams,
384 if (IS_ERR(remote_sd))
385 return PTR_ERR(remote_sd);
387 input = &xbar->inputs[sink_pad];
389 input->enable_count--;
391 if (!input->enable_count) {
392 ret = v4l2_subdev_disable_streams(remote_sd, remote_pad,
395 dev_err(xbar->isi->dev,
396 "failed to %s streams 0x%llx on '%s':%u: %d\n",
397 "disable", sink_streams, remote_sd->name,
400 mxc_isi_crossbar_gasket_disable(xbar, sink_pad);
406 static const struct v4l2_subdev_pad_ops mxc_isi_crossbar_subdev_pad_ops = {
407 .enum_mbus_code = mxc_isi_crossbar_enum_mbus_code,
408 .get_fmt = v4l2_subdev_get_fmt,
409 .set_fmt = mxc_isi_crossbar_set_fmt,
410 .set_routing = mxc_isi_crossbar_set_routing,
411 .enable_streams = mxc_isi_crossbar_enable_streams,
412 .disable_streams = mxc_isi_crossbar_disable_streams,
415 static const struct v4l2_subdev_ops mxc_isi_crossbar_subdev_ops = {
416 .pad = &mxc_isi_crossbar_subdev_pad_ops,
419 static const struct v4l2_subdev_internal_ops mxc_isi_crossbar_internal_ops = {
420 .init_state = mxc_isi_crossbar_init_state,
423 static const struct media_entity_operations mxc_isi_cross_entity_ops = {
424 .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
425 .link_validate = v4l2_subdev_link_validate,
426 .has_pad_interdep = v4l2_subdev_has_pad_interdep,
429 /* -----------------------------------------------------------------------------
433 int mxc_isi_crossbar_init(struct mxc_isi_dev *isi)
435 struct mxc_isi_crossbar *xbar = &isi->crossbar;
436 struct v4l2_subdev *sd = &xbar->sd;
437 unsigned int num_pads;
443 v4l2_subdev_init(sd, &mxc_isi_crossbar_subdev_ops);
444 sd->internal_ops = &mxc_isi_crossbar_internal_ops;
445 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
446 strscpy(sd->name, "crossbar", sizeof(sd->name));
449 sd->entity.function = MEDIA_ENT_F_VID_MUX;
450 sd->entity.ops = &mxc_isi_cross_entity_ops;
453 * The subdev has one sink and one source per port, plus one sink for
456 xbar->num_sinks = isi->pdata->num_ports + 1;
457 xbar->num_sources = isi->pdata->num_ports;
458 num_pads = xbar->num_sinks + xbar->num_sources;
460 xbar->pads = kcalloc(num_pads, sizeof(*xbar->pads), GFP_KERNEL);
464 xbar->inputs = kcalloc(xbar->num_sinks, sizeof(*xbar->inputs),
471 for (i = 0; i < xbar->num_sinks; ++i)
472 xbar->pads[i].flags = MEDIA_PAD_FL_SINK;
473 for (i = 0; i < xbar->num_sources; ++i)
474 xbar->pads[i + xbar->num_sinks].flags = MEDIA_PAD_FL_SOURCE;
476 ret = media_entity_pads_init(&sd->entity, num_pads, xbar->pads);
480 ret = v4l2_subdev_init_finalize(sd);
487 media_entity_cleanup(&sd->entity);
495 void mxc_isi_crossbar_cleanup(struct mxc_isi_crossbar *xbar)
497 media_entity_cleanup(&xbar->sd.entity);
502 int mxc_isi_crossbar_register(struct mxc_isi_crossbar *xbar)
504 return v4l2_device_register_subdev(&xbar->isi->v4l2_dev, &xbar->sd);
507 void mxc_isi_crossbar_unregister(struct mxc_isi_crossbar *xbar)