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|
// SPDX-License-Identifier: GPL-2.0-only
/*
* i.MX8 ISI - Input crossbar switch
*
* Copyright (c) 2022 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/minmax.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <media/media-entity.h>
#include <media/v4l2-subdev.h>
#include "imx8-isi-core.h"
static inline struct mxc_isi_crossbar *to_isi_crossbar(struct v4l2_subdev *sd)
{
return container_of(sd, struct mxc_isi_crossbar, sd);
}
static int mxc_isi_crossbar_gasket_enable(struct mxc_isi_crossbar *xbar,
struct v4l2_subdev_state *state,
struct v4l2_subdev *remote_sd,
u32 remote_pad, unsigned int port)
{
struct mxc_isi_dev *isi = xbar->isi;
const struct mxc_gasket_ops *gasket_ops = isi->pdata->gasket_ops;
const struct v4l2_mbus_framefmt *fmt;
struct v4l2_mbus_frame_desc fd;
int ret;
if (!gasket_ops)
return 0;
/*
* Configure and enable the gasket with the frame size and CSI-2 data
* type. For YUV422 8-bit, enable dual component mode unconditionally,
* to match the configuration of the CSIS.
*/
ret = v4l2_subdev_call(remote_sd, pad, get_frame_desc, remote_pad, &fd);
if (ret) {
dev_err(isi->dev,
"failed to get frame descriptor from '%s':%u: %d\n",
remote_sd->name, remote_pad, ret);
return ret;
}
if (fd.num_entries != 1) {
dev_err(isi->dev, "invalid frame descriptor for '%s':%u\n",
remote_sd->name, remote_pad);
return -EINVAL;
}
fmt = v4l2_subdev_state_get_format(state, port, 0);
if (!fmt)
return -EINVAL;
gasket_ops->enable(isi, &fd, fmt, port);
return 0;
}
static void mxc_isi_crossbar_gasket_disable(struct mxc_isi_crossbar *xbar,
unsigned int port)
{
struct mxc_isi_dev *isi = xbar->isi;
const struct mxc_gasket_ops *gasket_ops = isi->pdata->gasket_ops;
if (!gasket_ops)
return;
gasket_ops->disable(isi, port);
}
/* -----------------------------------------------------------------------------
* V4L2 subdev operations
*/
static const struct v4l2_mbus_framefmt mxc_isi_crossbar_default_format = {
.code = MXC_ISI_DEF_MBUS_CODE_SINK,
.width = MXC_ISI_DEF_WIDTH,
.height = MXC_ISI_DEF_HEIGHT,
.field = V4L2_FIELD_NONE,
.colorspace = MXC_ISI_DEF_COLOR_SPACE,
.ycbcr_enc = MXC_ISI_DEF_YCBCR_ENC,
.quantization = MXC_ISI_DEF_QUANTIZATION,
.xfer_func = MXC_ISI_DEF_XFER_FUNC,
};
static int __mxc_isi_crossbar_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_krouting *routing)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
struct v4l2_subdev_route *route;
int ret;
ret = v4l2_subdev_routing_validate(sd, routing,
V4L2_SUBDEV_ROUTING_NO_N_TO_1);
if (ret)
return ret;
/* The memory input can be routed to the first pipeline only. */
for_each_active_route(&state->routing, route) {
if (route->sink_pad == xbar->num_sinks - 1 &&
route->source_pad != xbar->num_sinks) {
dev_dbg(xbar->isi->dev,
"invalid route from memory input (%u) to pipe %u\n",
route->sink_pad,
route->source_pad - xbar->num_sinks);
return -EINVAL;
}
}
return v4l2_subdev_set_routing_with_fmt(sd, state, routing,
&mxc_isi_crossbar_default_format);
}
static struct v4l2_subdev *
mxc_isi_crossbar_xlate_streams(struct mxc_isi_crossbar *xbar,
struct v4l2_subdev_state *state,
u32 source_pad, u64 source_streams,
u32 *__sink_pad, u64 *__sink_streams,
u32 *remote_pad)
{
struct v4l2_subdev_route *route;
struct v4l2_subdev *sd;
struct media_pad *pad;
u64 sink_streams = 0;
int sink_pad = -1;
/*
* Translate the source pad and streams to the sink side. The routing
* validation forbids stream merging, so all matching entries in the
* routing table are guaranteed to have the same sink pad.
*
* TODO: This is likely worth a helper function, it could perhaps be
* supported by v4l2_subdev_state_xlate_streams() with pad1 set to -1.
*/
for_each_active_route(&state->routing, route) {
if (route->source_pad != source_pad ||
!(source_streams & BIT(route->source_stream)))
continue;
sink_streams |= BIT(route->sink_stream);
sink_pad = route->sink_pad;
}
if (sink_pad < 0) {
dev_dbg(xbar->isi->dev,
"no stream connected to pipeline %u\n",
source_pad - xbar->num_sinks);
return ERR_PTR(-EPIPE);
}
pad = media_pad_remote_pad_first(&xbar->pads[sink_pad]);
sd = media_entity_to_v4l2_subdev(pad->entity);
if (!sd) {
dev_dbg(xbar->isi->dev,
"no entity connected to crossbar input %u\n",
sink_pad);
return ERR_PTR(-EPIPE);
}
*__sink_pad = sink_pad;
*__sink_streams = sink_streams;
*remote_pad = pad->index;
return sd;
}
static int mxc_isi_crossbar_init_cfg(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
struct v4l2_subdev_krouting routing = { };
struct v4l2_subdev_route *routes;
unsigned int i;
int ret;
/*
* Create a 1:1 mapping between pixel link inputs and outputs to
* pipelines by default.
*/
routes = kcalloc(xbar->num_sources, sizeof(*routes), GFP_KERNEL);
if (!routes)
return -ENOMEM;
for (i = 0; i < xbar->num_sources; ++i) {
struct v4l2_subdev_route *route = &routes[i];
route->sink_pad = i;
route->source_pad = i + xbar->num_sinks;
route->flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE;
}
routing.num_routes = xbar->num_sources;
routing.routes = routes;
ret = __mxc_isi_crossbar_set_routing(sd, state, &routing);
kfree(routes);
return ret;
}
static int mxc_isi_crossbar_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
const struct mxc_isi_bus_format_info *info;
if (code->pad >= xbar->num_sinks) {
const struct v4l2_mbus_framefmt *format;
/*
* The media bus code on source pads is identical to the
* connected sink pad.
*/
if (code->index > 0)
return -EINVAL;
format = v4l2_subdev_state_get_opposite_stream_format(state,
code->pad,
code->stream);
if (!format)
return -EINVAL;
code->code = format->code;
return 0;
}
info = mxc_isi_bus_format_by_index(code->index, MXC_ISI_PIPE_PAD_SINK);
if (!info)
return -EINVAL;
code->code = info->mbus_code;
return 0;
}
static int mxc_isi_crossbar_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *fmt)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
struct v4l2_mbus_framefmt *sink_fmt;
struct v4l2_subdev_route *route;
if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
media_pad_is_streaming(&xbar->pads[fmt->pad]))
return -EBUSY;
/*
* The source pad format is always identical to the sink pad format and
* can't be modified.
*/
if (fmt->pad >= xbar->num_sinks)
return v4l2_subdev_get_fmt(sd, state, fmt);
/* Validate the requested format. */
if (!mxc_isi_bus_format_by_code(fmt->format.code, MXC_ISI_PIPE_PAD_SINK))
fmt->format.code = MXC_ISI_DEF_MBUS_CODE_SINK;
fmt->format.width = clamp_t(unsigned int, fmt->format.width,
MXC_ISI_MIN_WIDTH, MXC_ISI_MAX_WIDTH_CHAINED);
fmt->format.height = clamp_t(unsigned int, fmt->format.height,
MXC_ISI_MIN_HEIGHT, MXC_ISI_MAX_HEIGHT);
fmt->format.field = V4L2_FIELD_NONE;
/*
* Set the format on the sink stream and propagate it to the source
* streams.
*/
sink_fmt = v4l2_subdev_state_get_format(state, fmt->pad, fmt->stream);
if (!sink_fmt)
return -EINVAL;
*sink_fmt = fmt->format;
/* TODO: A format propagation helper would be useful. */
for_each_active_route(&state->routing, route) {
struct v4l2_mbus_framefmt *source_fmt;
if (route->sink_pad != fmt->pad ||
route->sink_stream != fmt->stream)
continue;
source_fmt = v4l2_subdev_state_get_format(state,
route->source_pad,
route->source_stream);
if (!source_fmt)
return -EINVAL;
*source_fmt = fmt->format;
}
return 0;
}
static int mxc_isi_crossbar_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
enum v4l2_subdev_format_whence which,
struct v4l2_subdev_krouting *routing)
{
if (which == V4L2_SUBDEV_FORMAT_ACTIVE &&
media_entity_is_streaming(&sd->entity))
return -EBUSY;
return __mxc_isi_crossbar_set_routing(sd, state, routing);
}
static int mxc_isi_crossbar_enable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
u32 pad, u64 streams_mask)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
struct v4l2_subdev *remote_sd;
struct mxc_isi_input *input;
u64 sink_streams;
u32 sink_pad;
u32 remote_pad;
int ret;
remote_sd = mxc_isi_crossbar_xlate_streams(xbar, state, pad, streams_mask,
&sink_pad, &sink_streams,
&remote_pad);
if (IS_ERR(remote_sd))
return PTR_ERR(remote_sd);
input = &xbar->inputs[sink_pad];
/*
* TODO: Track per-stream enable counts to support multiplexed
* streams.
*/
if (!input->enable_count) {
ret = mxc_isi_crossbar_gasket_enable(xbar, state, remote_sd,
remote_pad, sink_pad);
if (ret)
return ret;
ret = v4l2_subdev_enable_streams(remote_sd, remote_pad,
sink_streams);
if (ret) {
dev_err(xbar->isi->dev,
"failed to %s streams 0x%llx on '%s':%u: %d\n",
"enable", sink_streams, remote_sd->name,
remote_pad, ret);
mxc_isi_crossbar_gasket_disable(xbar, sink_pad);
return ret;
}
}
input->enable_count++;
return 0;
}
static int mxc_isi_crossbar_disable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
u32 pad, u64 streams_mask)
{
struct mxc_isi_crossbar *xbar = to_isi_crossbar(sd);
struct v4l2_subdev *remote_sd;
struct mxc_isi_input *input;
u64 sink_streams;
u32 sink_pad;
u32 remote_pad;
int ret = 0;
remote_sd = mxc_isi_crossbar_xlate_streams(xbar, state, pad, streams_mask,
&sink_pad, &sink_streams,
&remote_pad);
if (IS_ERR(remote_sd))
return PTR_ERR(remote_sd);
input = &xbar->inputs[sink_pad];
input->enable_count--;
if (!input->enable_count) {
ret = v4l2_subdev_disable_streams(remote_sd, remote_pad,
sink_streams);
if (ret)
dev_err(xbar->isi->dev,
"failed to %s streams 0x%llx on '%s':%u: %d\n",
"disable", sink_streams, remote_sd->name,
remote_pad, ret);
mxc_isi_crossbar_gasket_disable(xbar, sink_pad);
}
return ret;
}
static const struct v4l2_subdev_pad_ops mxc_isi_crossbar_subdev_pad_ops = {
.init_cfg = mxc_isi_crossbar_init_cfg,
.enum_mbus_code = mxc_isi_crossbar_enum_mbus_code,
.get_fmt = v4l2_subdev_get_fmt,
.set_fmt = mxc_isi_crossbar_set_fmt,
.set_routing = mxc_isi_crossbar_set_routing,
.enable_streams = mxc_isi_crossbar_enable_streams,
.disable_streams = mxc_isi_crossbar_disable_streams,
};
static const struct v4l2_subdev_ops mxc_isi_crossbar_subdev_ops = {
.pad = &mxc_isi_crossbar_subdev_pad_ops,
};
static const struct media_entity_operations mxc_isi_cross_entity_ops = {
.get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
.link_validate = v4l2_subdev_link_validate,
.has_pad_interdep = v4l2_subdev_has_pad_interdep,
};
/* -----------------------------------------------------------------------------
* Init & cleanup
*/
int mxc_isi_crossbar_init(struct mxc_isi_dev *isi)
{
struct mxc_isi_crossbar *xbar = &isi->crossbar;
struct v4l2_subdev *sd = &xbar->sd;
unsigned int num_pads;
unsigned int i;
int ret;
xbar->isi = isi;
v4l2_subdev_init(sd, &mxc_isi_crossbar_subdev_ops);
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
strscpy(sd->name, "crossbar", sizeof(sd->name));
sd->dev = isi->dev;
sd->entity.function = MEDIA_ENT_F_VID_MUX;
sd->entity.ops = &mxc_isi_cross_entity_ops;
/*
* The subdev has one sink and one source per port, plus one sink for
* the memory input.
*/
xbar->num_sinks = isi->pdata->num_ports + 1;
xbar->num_sources = isi->pdata->num_ports;
num_pads = xbar->num_sinks + xbar->num_sources;
xbar->pads = kcalloc(num_pads, sizeof(*xbar->pads), GFP_KERNEL);
if (!xbar->pads)
return -ENOMEM;
xbar->inputs = kcalloc(xbar->num_sinks, sizeof(*xbar->inputs),
GFP_KERNEL);
if (!xbar->inputs) {
ret = -ENOMEM;
goto err_free;
}
for (i = 0; i < xbar->num_sinks; ++i)
xbar->pads[i].flags = MEDIA_PAD_FL_SINK;
for (i = 0; i < xbar->num_sources; ++i)
xbar->pads[i + xbar->num_sinks].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&sd->entity, num_pads, xbar->pads);
if (ret)
goto err_free;
ret = v4l2_subdev_init_finalize(sd);
if (ret < 0)
goto err_entity;
return 0;
err_entity:
media_entity_cleanup(&sd->entity);
err_free:
kfree(xbar->pads);
kfree(xbar->inputs);
return ret;
}
void mxc_isi_crossbar_cleanup(struct mxc_isi_crossbar *xbar)
{
media_entity_cleanup(&xbar->sd.entity);
kfree(xbar->pads);
kfree(xbar->inputs);
}
int mxc_isi_crossbar_register(struct mxc_isi_crossbar *xbar)
{
return v4l2_device_register_subdev(&xbar->isi->v4l2_dev, &xbar->sd);
}
void mxc_isi_crossbar_unregister(struct mxc_isi_crossbar *xbar)
{
}
|