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Message-ID: <85b9936d12f17783552ddf2571c264584bb00030.camel@collabora.com>
Date: Thu, 03 Jul 2025 14:13:05 +0200
From: Julien Massot <julien.massot@...labora.com>
To: Cosmin Tanislav <demonsingur@...il.com>, Cosmin Tanislav
<cosmin.tanislav@...log.com>, Tomi Valkeinen
<tomi.valkeinen+renesas@...asonboard.com>, Mauro Carvalho Chehab
<mchehab@...nel.org>, Rob Herring <robh@...nel.org>, Niklas
Söderlund <niklas.soderlund@...natech.se>, Sakari Ailus
<sakari.ailus@...ux.intel.com>, Laurent Pinchart
<laurent.pinchart@...asonboard.com>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, Linus Walleij <linus.walleij@...aro.org>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-staging@...ts.linux.dev, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v5 17/24] media: i2c: add Maxim GMSL2/3 deserializer
framework
On Wed, 2025-07-02 at 16:20 +0300, Cosmin Tanislav wrote:
> These drivers are meant to be used as a common framework for Maxim
> GMSL2/3 deserializer.
>
> This framework enables support for the following new features across
> all the chips:
> * Full Streams API support
> * .get_frame_desc()
> * .get_mbus_config()
> * I2C ATR
> * automatic GMSL link version negotiation
> * automatic stream id selection
> * automatic VC remapping
> * automatic pixel mode / tunnel mode selection
> * automatic double mode selection / data padding
> * logging of internal state and chip status registers via .log_status()
> * PHY modes
> * serializer pinctrl
> * TPG
>
> Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
> ---
> drivers/media/i2c/maxim-serdes/Makefile | 2 +-
> drivers/media/i2c/maxim-serdes/max_des.c | 3111 ++++++++++++++++++++++
> drivers/media/i2c/maxim-serdes/max_des.h | 151 ++
> 3 files changed, 3263 insertions(+), 1 deletion(-)
> create mode 100644 drivers/media/i2c/maxim-serdes/max_des.c
> create mode 100644 drivers/media/i2c/maxim-serdes/max_des.h
>
> diff --git a/drivers/media/i2c/maxim-serdes/Makefile b/drivers/media/i2c/maxim-serdes/Makefile
> index 17511cb03369..b54326a5c81b 100644
> --- a/drivers/media/i2c/maxim-serdes/Makefile
> +++ b/drivers/media/i2c/maxim-serdes/Makefile
> @@ -1,3 +1,3 @@
> # SPDX-License-Identifier: GPL-2.0
> -max-serdes-objs := max_serdes.o max_ser.o
> +max-serdes-objs := max_serdes.o max_ser.o max_des.o
> obj-$(CONFIG_VIDEO_MAXIM_SERDES) += max-serdes.o
> diff --git a/drivers/media/i2c/maxim-serdes/max_des.c b/drivers/media/i2c/maxim-serdes/max_des.c
> new file mode 100644
> index 000000000000..2941fcc890c4
> --- /dev/null
> +++ b/drivers/media/i2c/maxim-serdes/max_des.c
> @@ -0,0 +1,3111 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Maxim GMSL2 Deserializer Driver
> + *
> + * Copyright (C) 2025 Analog Devices Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/i2c-atr.h>
> +#include <linux/i2c-mux.h>
> +#include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <media/mipi-csi2.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "max_des.h"
> +#include "max_ser.h"
> +#include "max_serdes.h"
> +
> +#define MAX_DES_LINK_FREQUENCY_MIN 100000000ull
> +#define MAX_DES_LINK_FREQUENCY_DEFAULT 750000000ull
> +#define MAX_DES_LINK_FREQUENCY_MAX 1250000000ull
> +
> +#define MAX_DES_PHYS_NUM 4
> +#define MAX_DES_PIPES_NUM 8
> +
> +struct max_des_priv {
> + struct max_des *des;
> +
> + struct device *dev;
> + struct i2c_client *client;
> + struct i2c_atr *atr;
> + struct i2c_mux_core *mux;
> +
> + struct media_pad *pads;
> + struct regulator **pocs;
> + struct max_serdes_source *sources;
> + u64 *streams_masks;
> +
> + struct notifier_block i2c_nb;
> + struct v4l2_subdev sd;
> + struct v4l2_async_notifier nf;
> + struct v4l2_ctrl_handler ctrl_handler;
> +
> + struct max_des_phy *unused_phy;
> +};
> +
> +struct max_des_remap_context {
> + enum max_serdes_gmsl_mode mode;
> + /* Mark whether TPG is enabled */
> + bool tpg;
> + /* Mark the PHYs to which each pipe is mapped. */
> + unsigned long pipe_phy_masks[MAX_DES_PIPES_NUM];
> + /* Mark the pipes in use. */
> + bool pipe_in_use[MAX_DES_PIPES_NUM];
> + /* Mark whether pipe has remapped VC ids. */
> + bool vc_ids_remapped[MAX_DES_PIPES_NUM];
> + /* Map between pipe VC ids and PHY VC ids. */
> + unsigned int vc_ids_map[MAX_DES_PIPES_NUM][MAX_DES_PHYS_NUM][MAX_SERDES_VC_ID_NUM];
> + /* Mark whether a pipe VC id has been mapped to a PHY VC id. */
> + unsigned long vc_ids_masks[MAX_DES_PIPES_NUM][MAX_DES_PHYS_NUM];
> + /* Mark whether a PHY VC id has been mapped. */
> + unsigned long dst_vc_ids_masks[MAX_DES_PHYS_NUM];
> +};
> +
> +struct max_des_mode_context {
> + bool phys_bpp8_shared_with_16[MAX_DES_PHYS_NUM];
> + bool pipes_bpp8_shared_with_16[MAX_DES_PIPES_NUM];
> + u32 phys_double_bpps[MAX_DES_PHYS_NUM];
> + u32 pipes_double_bpps[MAX_DES_PIPES_NUM];
> +};
> +
> +struct max_des_route_hw {
> + struct max_serdes_source *source;
> + struct max_des_pipe *pipe;
> + struct max_des_phy *phy;
> + struct v4l2_mbus_frame_desc_entry entry;
> + bool is_tpg;
> +};
> +
> +struct max_des_link_hw {
> + struct max_serdes_source *source;
> + struct max_des_link *link;
> + struct max_des_pipe *pipe;
> +};
> +
> +static inline struct max_des_priv *sd_to_priv(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct max_des_priv, sd);
> +}
> +
> +static inline struct max_des_priv *nf_to_priv(struct v4l2_async_notifier *nf)
> +{
> + return container_of(nf, struct max_des_priv, nf);
> +}
> +
> +static inline struct max_des_priv *ctrl_to_priv(struct v4l2_ctrl_handler *handler)
> +{
> + return container_of(handler, struct max_des_priv, ctrl_handler);
> +}
> +
> +static inline bool max_des_pad_is_sink(struct max_des *des, u32 pad)
> +{
> + return pad < des->ops->num_links;
> +}
> +
> +static inline bool max_des_pad_is_source(struct max_des *des, u32 pad)
> +{
> + return pad >= des->ops->num_links &&
> + pad < des->ops->num_links + des->ops->num_phys;
> +}
> +
> +static inline bool max_des_pad_is_tpg(struct max_des *des, u32 pad)
> +{
> + return pad == des->ops->num_links + des->ops->num_phys;
> +}
> +
> +static inline unsigned int max_des_link_to_pad(struct max_des *des,
> + struct max_des_link *link)
> +{
> + return link->index;
> +}
> +
> +static inline unsigned int max_des_phy_to_pad(struct max_des *des,
> + struct max_des_phy *phy)
> +{
> + return phy->index + des->ops->num_links;
> +}
> +
> +static inline unsigned int max_des_num_pads(struct max_des *des)
> +{
> + return des->ops->num_links + des->ops->num_phys +
> + (des->ops->set_tpg ? 1 : 0);
> +}
> +
> +static struct max_des_phy *max_des_pad_to_phy(struct max_des *des, u32 pad)
> +{
> + if (!max_des_pad_is_source(des, pad))
> + return NULL;
> +
> + return &des->phys[pad - des->ops->num_links];
> +}
> +
> +static struct max_des_link *max_des_pad_to_link(struct max_des *des, u32 pad)
> +{
> + if (!max_des_pad_is_sink(des, pad))
> + return NULL;
> +
> + return &des->links[pad];
> +}
> +
> +static struct max_des_pipe *
> +max_des_find_link_pipe(struct max_des *des, struct max_des_link *link)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> +
> + if (pipe->link_id == link->index)
> + return pipe;
> + }
> +
> + return NULL;
> +}
> +
> +static struct max_serdes_source *
> +max_des_get_link_source(struct max_des_priv *priv, struct max_des_link *link)
> +{
> + return &priv->sources[link->index];
> +}
> +
> +static const struct max_serdes_tpg_entry *
> +max_des_find_tpg_entry(struct max_des *des, u32 target_index,
> + u32 width, u32 height, u32 code,
> + u32 numerator, u32 denominator)
> +{
> + const struct max_serdes_tpg_entry *entry;
> + unsigned int index = 0;
> + unsigned int i;
> +
> + for (i = 0; i < des->ops->tpg_entries.num_entries; i++) {
> + entry = &des->ops->tpg_entries.entries[i];
> +
> + if ((width != 0 && width != entry->width) ||
> + (height != 0 && height != entry->height) ||
> + (code != 0 && code != entry->code) ||
> + (numerator != 0 && numerator != entry->interval.numerator) ||
> + (denominator != 0 && denominator != entry->interval.denominator))
> + continue;
> +
> + if (index == target_index)
> + break;
> +
> + index++;
> + }
> +
> + if (i == des->ops->tpg_entries.num_entries)
> + return NULL;
> +
> + return &des->ops->tpg_entries.entries[i];
> +}
> +
> +static const struct max_serdes_tpg_entry *
> +max_des_find_state_tpg_entry(struct max_des *des, struct v4l2_subdev_state *state,
> + unsigned int pad)
> +{
> + struct v4l2_mbus_framefmt *fmt;
> + struct v4l2_fract *in;
> +
> + fmt = v4l2_subdev_state_get_format(state, pad, MAX_SERDES_TPG_STREAM);
> + if (!fmt)
> + return NULL;
> +
> + in = v4l2_subdev_state_get_interval(state, pad, MAX_SERDES_TPG_STREAM);
> + if (!in)
> + return NULL;
> +
> + return max_des_find_tpg_entry(des, 0, fmt->width, fmt->height, fmt->code,
> + in->numerator, in->denominator);
> +}
> +
> +static int max_des_get_tpg_fd_entry_state(struct max_des *des,
> + struct v4l2_subdev_state *state,
> + struct v4l2_mbus_frame_desc_entry *fd_entry,
> + unsigned int pad)
> +{
> + const struct max_serdes_tpg_entry *entry;
> +
> + entry = max_des_find_state_tpg_entry(des, state, pad);
> + if (!entry)
> + return -EINVAL;
> +
> + fd_entry->stream = MAX_SERDES_TPG_STREAM;
> + fd_entry->flags = V4L2_MBUS_FRAME_DESC_FL_LEN_MAX;
> + fd_entry->length = entry->width * entry->height * entry->bpp / 8;
> + fd_entry->pixelcode = entry->code;
> + fd_entry->bus.csi2.vc = 0;
> + fd_entry->bus.csi2.dt = entry->dt;
> +
> + return 0;
> +}
> +
> +static int max_des_tpg_route_to_hw(struct max_des_priv *priv,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_route *route,
> + struct max_des_route_hw *hw)
> +{
> + struct max_des *des = priv->des;
> +
> + /* TPG injects its data into all pipes, but use pipe 0 for simplicity. */
> + hw->pipe = &des->pipes[0];
> +
> + hw->phy = max_des_pad_to_phy(des, route->source_pad);
> + if (!hw->phy)
> + return -ENOENT;
> +
> + return max_des_get_tpg_fd_entry_state(des, state, &hw->entry,
> + route->sink_pad);
> +}
> +
> +static int max_des_route_to_hw(struct max_des_priv *priv,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_route *route,
> + struct max_des_route_hw *hw)
> +{
> + struct max_des *des = priv->des;
> + struct v4l2_mbus_frame_desc fd;
> + struct max_des_link *link;
> + unsigned int i;
> + int ret;
> +
> + memset(hw, 0, sizeof(*hw));
> +
> + hw->is_tpg = max_des_pad_is_tpg(des, route->sink_pad);
> + if (hw->is_tpg)
> + return max_des_tpg_route_to_hw(priv, state, route, hw);
> +
> + link = max_des_pad_to_link(des, route->sink_pad);
> + if (!link)
> + return -ENOENT;
> +
> + hw->phy = max_des_pad_to_phy(des, route->source_pad);
> + if (!hw->phy)
> + return -ENOENT;
> +
> + hw->pipe = max_des_find_link_pipe(des, link);
> + if (!hw->pipe)
> + return -ENOENT;
> +
> + hw->source = max_des_get_link_source(priv, link);
> + if (!hw->source->sd)
> + return 0;
> +
> + ret = v4l2_subdev_call(hw->source->sd, pad, get_frame_desc,
> + hw->source->pad, &fd);
> + if (ret)
> + return ret;
Are we still supporting sensors that doesn't implement the get_frame_desc ?
> +
> + for (i = 0; i < fd.num_entries; i++)
> + if (fd.entry[i].stream == route->sink_stream)
> + break;
> +
> + if (i == fd.num_entries)
> + return -ENOENT;
> +
> + hw->entry = fd.entry[i];
> +
> + return 0;
> +}
> +
> +static int max_des_link_to_hw(struct max_des_priv *priv,
> + struct max_des_link *link,
> + struct max_des_link_hw *hw)
> +{
> + struct max_des *des = priv->des;
> +
> + memset(hw, 0, sizeof(*hw));
> +
> + hw->link = link;
> +
> + hw->pipe = max_des_find_link_pipe(des, hw->link);
> + if (!hw->pipe)
> + return -ENOENT;
> +
> + hw->source = max_des_get_link_source(priv, hw->link);
> +
> + return 0;
> +}
> +
> +static int max_des_link_index_to_hw(struct max_des_priv *priv, unsigned int i,
> + struct max_des_link_hw *hw)
> +{
> + return max_des_link_to_hw(priv, &priv->des->links[i], hw);
> +}
> +
> +static int max_des_set_pipe_remaps(struct max_des_priv *priv,
> + struct max_des_pipe *pipe,
> + struct max_des_remap *remaps,
> + unsigned int num_remaps)
> +{
> + struct max_des *des = priv->des;
> + unsigned int mask = 0;
> + unsigned int i;
> + int ret;
> +
> + if (!des->ops->set_pipe_remap)
> + return 0;
> +
> + for (i = 0; i < num_remaps; i++) {
> + ret = des->ops->set_pipe_remap(des, pipe, i, &remaps[i]);
> + if (ret)
> + return ret;
> +
> + mask |= BIT(i);
> + }
> +
> + return des->ops->set_pipe_remaps_enable(des, pipe, mask);
> +}
> +
> +static int max_des_set_pipe_vc_remaps(struct max_des_priv *priv,
> + struct max_des_pipe *pipe,
> + struct max_serdes_vc_remap *vc_remaps,
> + unsigned int num_vc_remaps)
> +{
> + struct max_des *des = priv->des;
> + unsigned int mask = 0;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < num_vc_remaps; i++) {
> + ret = des->ops->set_pipe_vc_remap(des, pipe, i, &vc_remaps[i]);
> + if (ret)
> + return ret;
> +
> + mask |= BIT(i);
> + }
> +
> + return des->ops->set_pipe_vc_remaps_enable(des, pipe, mask);
> +}
> +
> +static int max_des_map_src_dst_vc_id(struct max_des_remap_context *context,
> + unsigned int pipe_id, unsigned int phy_id,
> + unsigned int src_vc_id, bool keep_vc)
> +{
> + unsigned int vc_id;
> +
> + if (src_vc_id >= MAX_SERDES_VC_ID_NUM)
> + return -E2BIG;
> +
> + if (context->vc_ids_masks[pipe_id][phy_id] & BIT(src_vc_id))
> + return 0;
> +
> + if (keep_vc && !(context->dst_vc_ids_masks[phy_id] & BIT(src_vc_id)))
> + vc_id = src_vc_id;
> + else
> + vc_id = ffz(context->dst_vc_ids_masks[phy_id]);
> +
> + if (vc_id != src_vc_id)
> + context->vc_ids_remapped[pipe_id] = true;
> +
> + if (vc_id >= MAX_SERDES_VC_ID_NUM)
> + return -E2BIG;
> +
> + context->pipe_phy_masks[pipe_id] |= BIT(phy_id);
> + context->dst_vc_ids_masks[phy_id] |= BIT(vc_id);
> +
> + context->vc_ids_map[pipe_id][phy_id][src_vc_id] = vc_id;
> + context->vc_ids_masks[pipe_id][phy_id] |= BIT(src_vc_id);
> +
> + return 0;
> +}
> +
> +static int max_des_get_src_dst_vc_id(struct max_des_remap_context *context,
> + unsigned int pipe_id, unsigned int phy_id,
> + unsigned int src_vc_id, unsigned int *dst_vc_id)
> +{
> + if (!(context->vc_ids_masks[pipe_id][phy_id] & BIT(src_vc_id)))
> + return -ENOENT;
> +
> + *dst_vc_id = context->vc_ids_map[pipe_id][phy_id][src_vc_id];
> +
> + return 0;
> +}
> +
> +static int max_des_populate_remap_usage(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct v4l2_subdev_state *state)
> +{
> + struct v4l2_subdev_route *route;
> + int ret;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + if (hw.is_tpg)
> + context->tpg = true;
> +
> + context->pipe_in_use[hw.pipe->index] = true;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_get_supported_modes(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + unsigned int *modes)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + *modes = des->ops->modes;
> +
> + if (context->tpg)
> + *modes = BIT(des->ops->tpg_mode);
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link_hw hw;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + if (!context->pipe_in_use[hw.pipe->index])
> + continue;
> +
> + *modes &= max_ser_get_supported_modes(hw.source->sd);
> + }
> +
> + /*
> + * Serializers need to all be in the same mode because of hardware
> + * issues when running them in mixed modes.
> + */
> + if (!*modes)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int max_des_populate_remap_context_mode(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + unsigned int modes)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + context->mode = MAX_SERDES_GMSL_PIXEL_MODE;
> +
> + /*
> + * If pixel mode is the only supported mode, do not try to see if
> + * tunnel mode can be used.
> + */
> + if (modes == BIT(MAX_SERDES_GMSL_PIXEL_MODE))
> + return 0;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link_hw hw;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + if (!context->pipe_in_use[hw.pipe->index])
> + continue;
> +
> + if (hweight_long(context->pipe_phy_masks[hw.pipe->index]) == 1 &&
> + (!context->vc_ids_remapped[hw.pipe->index] ||
> + max_ser_supports_vc_remap(hw.source->sd) ||
> + des->ops->set_pipe_vc_remap))
> + continue;
> +
> + return 0;
> + }
> +
> + context->mode = MAX_SERDES_GMSL_TUNNEL_MODE;
> +
> + return 0;
> +}
> +
> +static int max_des_should_keep_vc(struct max_des_priv *priv,
> + struct max_des_route_hw *hw,
> + unsigned int modes)
> +{
> + struct max_des *des = priv->des;
> +
> + /* Pixel mode deserializers always have the ability to remap VCs. */
> + if (modes == BIT(MAX_SERDES_GMSL_PIXEL_MODE))
> + return false;
> +
> + if (des->ops->set_pipe_vc_remap)
> + return false;
> +
> + if (!hw->is_tpg && hw->source && hw->source->sd &&
> + max_ser_supports_vc_remap(hw->source->sd))
> + return false;
> +
> + return true;
> +}
> +
> +static int max_des_populate_remap_context(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct v4l2_subdev_state *state)
> +{
> + struct v4l2_subdev_route *route;
> + unsigned int modes;
> + int ret;
> +
> + ret = max_des_populate_remap_usage(priv, context, state);
> + if (ret)
> + return ret;
> +
> + ret = max_des_get_supported_modes(priv, context, &modes);
> + if (ret)
> + return ret;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> + bool keep_vc;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + keep_vc = max_des_should_keep_vc(priv, &hw, modes);
> +
> + ret = max_des_map_src_dst_vc_id(context, hw.pipe->index, hw.phy->index,
> + hw.entry.bus.csi2.vc, keep_vc);
> + if (ret)
> + return ret;
> + }
> +
> + return max_des_populate_remap_context_mode(priv, context, modes);
> +}
> +
> +static int max_des_populate_mode_context(struct max_des_priv *priv,
> + struct max_des_mode_context *context,
> + struct v4l2_subdev_state *state,
> + enum max_serdes_gmsl_mode mode)
> +{
> + bool bpp8_not_shared_with_16_phys[MAX_DES_PHYS_NUM] = { 0 };
> + u32 undoubled_bpps_phys[MAX_DES_PHYS_NUM] = { 0 };
> + u32 bpps_pipes[MAX_DES_PIPES_NUM] = { 0 };
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + unsigned int i;
> + int ret;
> +
> + if (mode != MAX_SERDES_GMSL_PIXEL_MODE)
> + return 0;
> +
> + /*
> + * Go over all streams and gather the bpps for all pipes.
> + *
> + * Then, go over all the streams again and check if the
> + * current stream is doubled.
> + *
> + * If the current stream is doubled, add it to a doubled mask for both
> + * the pipe and the PHY.
> + *
> + * If the current stream is not doubled, add it to a local undoubled
> + * mask for the PHY.
> + *
> + * Also, track whether an 8bpp stream is shared with any bpp > 8 on both
> + * the PHYs and the pipes, since that needs to be special cased.
> + *
> + * After going over all the streams, remove the undoubled streams from
> + * the doubled ones. Doubled and undoubled streams cannot be streamed
> + * over the same PHY.
> + *
> + * Then, do a second pass to remove the undoubled streams from the pipes.
> + *
> + * This operation cannot be done in a single pass because any pipe might
> + * generate an undoubled stream for a specific bpp, causing already
> + * processed pipes to need to have their doubled bpps updated.
> + */
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> + unsigned int bpp;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + ret = max_serdes_get_fd_bpp(&hw.entry, &bpp);
> + if (ret)
> + return ret;
> +
> + bpps_pipes[hw.pipe->index] |= BIT(bpp);
> + }
> +
> + for_each_active_route(&state->routing, route) {
> + unsigned int bpp, min_bpp, max_bpp, doubled_bpp;
> + unsigned int pipe_id, phy_id;
> + struct max_des_route_hw hw;
> + u32 sink_bpps;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + ret = max_serdes_get_fd_bpp(&hw.entry, &bpp);
> + if (ret)
> + return ret;
> +
> + sink_bpps = bpps_pipes[hw.pipe->index];
> +
> + ret = max_serdes_process_bpps(priv->dev, sink_bpps, ~0U, &doubled_bpp);
> + if (ret)
> + return ret;
> +
> + min_bpp = __ffs(sink_bpps);
> + max_bpp = __fls(sink_bpps);
> + pipe_id = hw.pipe->index;
> + phy_id = hw.phy->index;
> +
> + if (bpp == doubled_bpp) {
> + context->phys_double_bpps[phy_id] |= BIT(bpp);
> + context->pipes_double_bpps[pipe_id] |= BIT(bpp);
> + } else {
> + undoubled_bpps_phys[phy_id] |= BIT(bpp);
> + }
> +
> + if (min_bpp == 8 && max_bpp > 8) {
> + context->phys_bpp8_shared_with_16[phy_id] = true;
> + context->pipes_bpp8_shared_with_16[pipe_id] = true;
> + } else if (min_bpp == 8 && max_bpp == 8) {
> + bpp8_not_shared_with_16_phys[phy_id] = true;
> + }
> + }
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + if (context->phys_bpp8_shared_with_16[i] && bpp8_not_shared_with_16_phys[i]) {
> + dev_err(priv->dev,
> + "Cannot stream 8bpp coming from pipes padded to 16bpp "
> + "and pipes not padded to 16bpp on the same PHY\n");
> + return -EINVAL;
> + }
> + }
> +
> + for (i = 0; i < des->ops->num_phys; i++)
> + context->phys_double_bpps[i] &= ~undoubled_bpps_phys[i];
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + context->pipes_double_bpps[hw.pipe->index] &=
> + context->phys_double_bpps[hw.phy->index];
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_add_vc_remap(struct max_des *des, struct max_serdes_vc_remap *vc_remaps,
> + unsigned int *num_vc_remaps, unsigned int src_vc_id,
> + unsigned int dst_vc_id)
> +{
> + struct max_serdes_vc_remap *vc_remap;
> + unsigned int i;
> +
> + for (i = 0; i < *num_vc_remaps; i++) {
> + vc_remap = &vc_remaps[i];
> +
> + if (vc_remap->src == src_vc_id && vc_remap->dst == dst_vc_id)
> + return 0;
> + }
> +
> + if (*num_vc_remaps == MAX_SERDES_VC_ID_NUM)
> + return -E2BIG;
> +
> + vc_remaps[*num_vc_remaps].src = src_vc_id;
> + vc_remaps[*num_vc_remaps].dst = dst_vc_id;
> +
> + (*num_vc_remaps)++;
> +
> + return 0;
> +}
> +
> +static int max_des_get_pipe_vc_remaps(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_pipe *pipe,
> + struct max_serdes_vc_remap *vc_remaps,
> + unsigned int *num_vc_remaps,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks, bool with_tpg)
> +{
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + int ret;
> +
> + *num_vc_remaps = 0;
> +
> + if (context->mode != MAX_SERDES_GMSL_TUNNEL_MODE)
> + return 0;
> +
> + for_each_active_route(&state->routing, route) {
> + unsigned int src_vc_id, dst_vc_id;
> + struct max_des_route_hw hw;
> +
> + if (!(BIT_ULL(route->sink_stream) & streams_masks[route->sink_pad]))
> + continue;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + if (!with_tpg && hw.is_tpg)
> + continue;
> +
> + if (hw.pipe != pipe)
> + continue;
> +
> + src_vc_id = hw.entry.bus.csi2.vc;
> +
> + ret = max_des_get_src_dst_vc_id(context, pipe->index, hw.phy->index,
> + src_vc_id, &dst_vc_id);
> + if (ret)
> + return ret;
> +
> + ret = max_des_add_vc_remap(des, vc_remaps, num_vc_remaps,
> + src_vc_id, dst_vc_id);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void max_des_get_pipe_mode(struct max_des_mode_context *context,
> + struct max_des_pipe *pipe,
> + struct max_des_pipe_mode *mode)
> +{
> + u32 double_bpps = context->pipes_double_bpps[pipe->index];
> +
> + if ((double_bpps & BIT(8)) &&
> + !context->pipes_bpp8_shared_with_16[pipe->index]) {
> + mode->dbl8 = true;
> + mode->dbl8mode = true;
> + }
> +}
> +
> +static void max_des_get_phy_mode(struct max_des_mode_context *context,
> + struct max_des_phy *phy,
> + struct max_des_phy_mode *mode)
> +{
> + bool bpp8_pipe_shared_with_16 = context->phys_bpp8_shared_with_16[phy->index];
> + u32 double_bpps = context->phys_double_bpps[phy->index];
> +
> + if (BIT(8) & double_bpps) {
> + if (bpp8_pipe_shared_with_16)
> + mode->alt2_mem_map8 = true;
> + else
> + mode->alt_mem_map8 = true;
> + }
> +
> + if (BIT(10) & double_bpps)
> + mode->alt_mem_map10 = true;
> +
> + if (BIT(12) & double_bpps)
> + mode->alt_mem_map12 = true;
> +}
> +
> +static int max_des_set_modes(struct max_des_priv *priv,
> + struct max_des_mode_context *context)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + struct max_des_phy *phy = &des->phys[i];
> + struct max_des_phy_mode mode = { 0 };
> +
> + max_des_get_phy_mode(context, phy, &mode);
> +
> + if (phy->mode.alt_mem_map8 == mode.alt_mem_map8 &&
> + phy->mode.alt_mem_map10 == mode.alt_mem_map10 &&
> + phy->mode.alt_mem_map12 == mode.alt_mem_map12 &&
> + phy->mode.alt2_mem_map8 == mode.alt2_mem_map8)
> + continue;
> +
> + if (des->ops->set_phy_mode) {
> + ret = des->ops->set_phy_mode(des, phy, &mode);
> + if (ret)
> + return ret;
> + }
> +
> + phy->mode = mode;
> + }
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> + struct max_des_pipe_mode mode = { 0 };
> +
> + max_des_get_pipe_mode(context, pipe, &mode);
> +
> + if (pipe->mode.dbl8 == mode.dbl8 &&
> + pipe->mode.dbl10 == mode.dbl10 &&
> + pipe->mode.dbl12 == mode.dbl12 &&
> + pipe->mode.dbl8mode == mode.dbl8mode &&
> + pipe->mode.dbl10mode == mode.dbl10mode)
> + continue;
> +
> + if (des->ops->set_pipe_mode) {
> + ret = des->ops->set_pipe_mode(des, pipe, &mode);
> + if (ret)
> + return ret;
> + }
> +
> + pipe->mode = mode;
> + }
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link_hw hw;
> + u32 pipe_double_bpps = 0;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + pipe_double_bpps = context->pipes_double_bpps[hw.pipe->index];
> +
> + ret = max_ser_set_double_bpps(hw.source->sd, pipe_double_bpps);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_set_tunnel(struct max_des_priv *priv,
> + struct max_des_remap_context *context)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + if (des->ops->set_pipe_tunnel_enable) {
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> + bool tunnel_mode = context->mode == MAX_SERDES_GMSL_TUNNEL_MODE;
> +
> + ret = des->ops->set_pipe_tunnel_enable(des, pipe, tunnel_mode);
> + if (ret)
> + return ret;
> + }
> + }
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link_hw hw;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + if (!context->pipe_in_use[hw.pipe->index])
> + continue;
> +
> + ret = max_ser_set_mode(hw.source->sd, context->mode);
> + if (ret)
> + return ret;
> + }
> +
> + des->mode = context->mode;
> +
> + return 0;
> +}
> +
> +static int max_des_set_vc_remaps(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + if (des->ops->set_pipe_vc_remap)
> + return 0;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_serdes_vc_remap vc_remaps[MAX_SERDES_VC_ID_NUM];
> + struct max_des_link_hw hw;
> + unsigned int num_vc_remaps;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + if (!max_ser_supports_vc_remap(hw.source->sd))
> + continue;
> +
> + ret = max_des_get_pipe_vc_remaps(priv, context, hw.pipe,
> + vc_remaps, &num_vc_remaps,
> + state, streams_masks, false);
> + if (ret)
> + return ret;
> +
> + ret = max_ser_set_vc_remaps(hw.source->sd, vc_remaps, num_vc_remaps);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_set_pipes_stream_id(struct max_des_priv *priv)
> +{
> + bool stream_id_usage[MAX_SERDES_STREAMS_NUM] = { 0 };
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link_hw hw;
> + unsigned int stream_id;
> +
> + ret = max_des_link_index_to_hw(priv, i, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.link->enabled)
> + continue;
> +
> + if (!hw.source->sd)
> + continue;
> +
> + stream_id = hw.pipe->stream_id;
> +
> + ret = max_ser_set_stream_id(hw.source->sd, stream_id);
> + if (ret == -EOPNOTSUPP) {
> + /*
> + * Serializer does not support setting the stream id, retrieve
> + * its hardcoded stream id.
> + */
> + ret = max_ser_get_stream_id(hw.source->sd, &stream_id);
> + }
> +
> + if (ret)
> + return ret;
> +
> + if (stream_id_usage[stream_id] && des->ops->needs_unique_stream_id) {
> + dev_err(priv->dev, "Duplicate stream id %u\n", stream_id);
> + return -EINVAL;
> + }
> +
> + ret = des->ops->set_pipe_stream_id(des, hw.pipe, stream_id);
> + if (ret)
> + return ret;
> +
> + stream_id_usage[stream_id] = true;
> + hw.pipe->stream_id = stream_id;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_set_pipes_phy(struct max_des_priv *priv,
> + struct max_des_remap_context *context)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + if (!des->ops->set_pipe_phy && !des->ops->set_pipe_tunnel_phy)
> + return 0;
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> + struct max_des_phy *phy;
> + unsigned int phy_id;
> +
> + phy_id = find_first_bit(&context->pipe_phy_masks[pipe->index],
> + des->ops->num_phys);
> +
> + if (priv->unused_phy &&
> + (context->mode != MAX_SERDES_GMSL_TUNNEL_MODE ||
> + phy_id == des->ops->num_phys))
> + phy_id = priv->unused_phy->index;
> +
> + if (phy_id != des->ops->num_phys) {
> + phy = &des->phys[phy_id];
> +
> + if (context->mode == MAX_SERDES_GMSL_PIXEL_MODE &&
> + des->ops->set_pipe_phy)
> + ret = des->ops->set_pipe_phy(des, pipe, phy);
> + else if (context->mode == MAX_SERDES_GMSL_TUNNEL_MODE &&
> + des->ops->set_pipe_tunnel_phy)
> + ret = des->ops->set_pipe_tunnel_phy(des, pipe, phy);
> + else
> + ret = 0;
> +
> + if (ret)
> + return ret;
> + }
> +
> + pipe->phy_id = phy_id;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_add_remap(struct max_des *des, struct max_des_remap *remaps,
> + unsigned int *num_remaps, unsigned int phy_id,
> + unsigned int src_vc_id, unsigned int dst_vc_id,
> + unsigned int dt)
> +{
> + struct max_des_remap *remap;
> + unsigned int i;
> +
> + for (i = 0; i < *num_remaps; i++) {
> + remap = &remaps[i];
> +
> + if (remap->from_dt == dt && remap->to_dt == dt &&
> + remap->from_vc == src_vc_id && remap->to_vc == dst_vc_id &&
> + remap->phy == phy_id)
> + return 0;
> + }
> +
> + if (*num_remaps == des->ops->num_remaps_per_pipe)
> + return -E2BIG;
> +
> + remap = &remaps[*num_remaps];
> + remap->from_dt = dt;
> + remap->from_vc = src_vc_id;
> + remap->to_dt = dt;
> + remap->to_vc = dst_vc_id;
> + remap->phy = phy_id;
> +
> + (*num_remaps)++;
> +
> + return 0;
> +}
> +
> +static int max_des_add_remaps(struct max_des *des, struct max_des_remap *remaps,
> + unsigned int *num_remaps, unsigned int phy_id,
> + unsigned int src_vc_id, unsigned int dst_vc_id,
> + unsigned int dt)
> +{
> + int ret;
> +
> + ret = max_des_add_remap(des, remaps, num_remaps, phy_id,
> + src_vc_id, dst_vc_id, dt);
> + if (ret)
> + return ret;
> +
> + ret = max_des_add_remap(des, remaps, num_remaps, phy_id,
> + src_vc_id, dst_vc_id, MIPI_CSI2_DT_FS);
> + if (ret)
> + return ret;
> +
> + ret = max_des_add_remap(des, remaps, num_remaps, phy_id,
> + src_vc_id, dst_vc_id, MIPI_CSI2_DT_FE);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int max_des_get_pipe_remaps(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_pipe *pipe,
> + struct max_des_remap *remaps,
> + unsigned int *num_remaps,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct v4l2_mbus_frame_desc_entry tpg_entry = { 0 };
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + bool is_tpg_pipe = true;
> + int ret;
> +
> + *num_remaps = 0;
> +
> + if (context->mode != MAX_SERDES_GMSL_PIXEL_MODE)
> + return 0;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> + unsigned int src_vc_id, dst_vc_id;
> +
> + if (!(BIT_ULL(route->sink_stream) & streams_masks[route->sink_pad]))
> + continue;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + if (hw.is_tpg && hw.pipe != pipe) {
> + is_tpg_pipe = false;
> + tpg_entry = hw.entry;
> + }
> +
> + if (hw.pipe != pipe)
> + continue;
> +
> + src_vc_id = hw.entry.bus.csi2.vc;
> +
> + ret = max_des_get_src_dst_vc_id(context, pipe->index, hw.phy->index,
> + src_vc_id, &dst_vc_id);
> + if (ret)
> + return ret;
> +
> + ret = max_des_add_remaps(des, remaps, num_remaps, hw.phy->index,
> + src_vc_id, dst_vc_id,
> + hw.entry.bus.csi2.dt);
> + if (ret)
> + return ret;
> + }
> +
> + /*
> + * TPG mode is only handled on pipe 0, but the TPG pollutes other pipes
> + * with the same data.
> + * For devices that do not support setting the default PHY of a pipe,
> + * we want to filter out this data so it does not end up on the wrong
> + * PHY.
> + * Devices that support setting the default PHY of a pipe already use it
> + * to route unused pipes to an unused PHY.
> + */
> + if (context->tpg && !is_tpg_pipe && !des->ops->set_pipe_phy &&
> + priv->unused_phy) {
> + ret = max_des_add_remaps(des, remaps, num_remaps,
> + priv->unused_phy->index,
> + tpg_entry.bus.csi2.vc,
> + tpg_entry.bus.csi2.vc,
> + tpg_entry.bus.csi2.dt);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_update_pipe_vc_remaps(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_pipe *pipe,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + struct max_serdes_vc_remap *vc_remaps;
> + unsigned int num_vc_remaps;
> + int ret;
> +
> + if (!des->ops->set_pipe_vc_remap)
> + return 0;
> +
> + vc_remaps = devm_kcalloc(priv->dev, MAX_SERDES_VC_ID_NUM,
> + sizeof(*vc_remaps), GFP_KERNEL);
> + if (!vc_remaps)
> + return -ENOMEM;
> +
> + ret = max_des_get_pipe_vc_remaps(priv, context, pipe, vc_remaps, &num_vc_remaps,
> + state, streams_masks, true);
> + if (ret)
> + goto err_free_new_vc_remaps;
> +
> + ret = max_des_set_pipe_vc_remaps(priv, pipe, vc_remaps, num_vc_remaps);
> + if (ret)
> + goto err_free_new_vc_remaps;
> +
> + if (pipe->num_vc_remaps)
> + devm_kfree(priv->dev, pipe->vc_remaps);
> +
> + pipe->vc_remaps = vc_remaps;
> + pipe->num_vc_remaps = num_vc_remaps;
> +
> + return 0;
> +
> +err_free_new_vc_remaps:
> + devm_kfree(priv->dev, vc_remaps);
> +
> + return ret;
> +}
> +
> +static int max_des_update_pipe_remaps(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_pipe *pipe,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + struct max_des_remap *remaps;
> + unsigned int num_remaps;
> + int ret;
> +
> + if (!des->ops->set_pipe_remap)
> + return 0;
> +
> + remaps = devm_kcalloc(priv->dev, des->ops->num_remaps_per_pipe,
> + sizeof(*remaps), GFP_KERNEL);
> + if (!remaps)
> + return -ENOMEM;
> +
> + ret = max_des_get_pipe_remaps(priv, context, pipe, remaps, &num_remaps,
> + state, streams_masks);
> + if (ret)
> + goto err_free_new_remaps;
> +
> + ret = max_des_set_pipe_remaps(priv, pipe, remaps, num_remaps);
> + if (ret)
> + goto err_free_new_remaps;
> +
> + if (pipe->remaps)
> + devm_kfree(priv->dev, pipe->remaps);
> +
> + pipe->remaps = remaps;
> + pipe->num_remaps = num_remaps;
> +
> + return 0;
> +
> +err_free_new_remaps:
> + devm_kfree(priv->dev, remaps);
> +
> + return ret;
> +}
> +
> +static int max_des_update_pipe_enable(struct max_des_priv *priv,
> + struct max_des_pipe *pipe,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + bool enable = false;
> + int ret;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> +
> + if (!(BIT_ULL(route->sink_stream) & streams_masks[route->sink_pad]))
> + continue;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + if (hw.pipe != pipe)
> + continue;
> +
> + enable = true;
> + break;
> + }
> +
> + if (enable == pipe->enabled)
> + return 0;
> +
> + ret = des->ops->set_pipe_enable(des, pipe, enable);
> + if (ret)
> + return ret;
> +
> + pipe->enabled = enable;
> +
> + return 0;
> +}
> +
> +static int max_des_update_pipe(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_pipe *pipe,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + int ret;
> +
> + ret = max_des_update_pipe_remaps(priv, context, pipe,
> + state, streams_masks);
> + if (ret)
> + return ret;
> +
> + ret = max_des_update_pipe_vc_remaps(priv, context, pipe, state,
> + streams_masks);
> + if (ret)
> + goto err_revert_update_pipe_remaps;
> +
> + ret = max_des_update_pipe_enable(priv, pipe, state, streams_masks);
> + if (ret)
> + goto err_revert_update_pipe_vc_remaps;
> +
> + return 0;
> +
> +err_revert_update_pipe_vc_remaps:
> + max_des_update_pipe_vc_remaps(priv, context, pipe, state,
> + priv->streams_masks);
> +
> +err_revert_update_pipe_remaps:
> + max_des_update_pipe_remaps(priv, context, pipe, state,
> + priv->streams_masks);
> +
> + return ret;
> +}
> +
> +static int max_des_init_link_ser_xlate(struct max_des_priv *priv,
> + struct max_des_link *link,
> + struct i2c_adapter *adapter,
> + u8 power_up_addr, u8 new_addr)
> +{
> + struct max_des *des = priv->des;
> + u8 addrs[] = { power_up_addr, new_addr };
> + u8 current_addr;
> + int ret;
> +
> + ret = des->ops->select_links(des, BIT(link->index));
> + if (ret)
> + return ret;
> +
> + ret = max_ser_wait_for_multiple(adapter, addrs, ARRAY_SIZE(addrs),
> + ¤t_addr);
> + if (ret) {
> + dev_err(priv->dev,
> + "Failed to wait for serializer at 0x%02x or 0x%02x: %d\n",
> + power_up_addr, new_addr, ret);
> + return ret;
> + }
> +
> + ret = max_ser_reset(adapter, current_addr);
> + if (ret) {
> + dev_err(priv->dev, "Failed to reset serializer: %d\n", ret);
> + return ret;
> + }
> +
> + ret = max_ser_wait(adapter, power_up_addr);
> + if (ret) {
> + dev_err(priv->dev,
> + "Failed to wait for serializer at 0x%02x: %d\n",
> + power_up_addr, ret);
> + return ret;
> + }
> +
> + ret = max_ser_change_address(adapter, power_up_addr, new_addr);
> + if (ret) {
> + dev_err(priv->dev,
> + "Failed to change serializer from 0x%02x to 0x%02x: %d\n",
> + power_up_addr, new_addr, ret);
> + return ret;
> + }
> +
> + ret = max_ser_wait(adapter, new_addr);
> + if (ret) {
> + dev_err(priv->dev,
> + "Failed to wait for serializer at 0x%02x: %d\n",
> + new_addr, ret);
> + return ret;
> + }
> +
> + if (des->ops->fix_tx_ids) {
> + ret = max_ser_fix_tx_ids(adapter, new_addr);
> + if (ret)
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static int max_des_init(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + if (des->ops->init) {
> + ret = des->ops->init(des);
> + if (ret)
> + return ret;
> + }
> +
> + if (des->ops->set_enable) {
> + ret = des->ops->set_enable(des, false);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + struct max_des_phy *phy = &des->phys[i];
> +
> + if (phy->enabled) {
> + ret = des->ops->init_phy(des, phy);
> + if (ret)
> + return ret;
> + }
> +
> + ret = des->ops->set_phy_enable(des, phy, phy->enabled);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> + struct max_des_link *link = &des->links[pipe->link_id];
> +
> + ret = des->ops->set_pipe_enable(des, pipe, false);
> + if (ret)
> + return ret;
> +
> + if (des->ops->set_pipe_tunnel_enable) {
> + ret = des->ops->set_pipe_tunnel_enable(des, pipe, false);
> + if (ret)
> + return ret;
> + }
> +
> + if (des->ops->set_pipe_stream_id) {
> + ret = des->ops->set_pipe_stream_id(des, pipe, pipe->stream_id);
> + if (ret)
> + return ret;
> + }
> +
> + if (des->ops->set_pipe_link) {
> + ret = des->ops->set_pipe_link(des, pipe, link);
> + if (ret)
> + return ret;
> + }
> +
> + ret = max_des_set_pipe_remaps(priv, pipe, pipe->remaps,
> + pipe->num_remaps);
> + if (ret)
> + return ret;
> + }
> +
> + if (!des->ops->init_link)
> + return 0;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + if (!link->enabled)
> + continue;
> +
> + ret = des->ops->init_link(des, link);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void max_des_ser_find_version_range(struct max_des *des, int *min, int *max)
> +{
> + unsigned int i;
> +
> + *min = MAX_SERDES_GMSL_MIN;
> + *max = MAX_SERDES_GMSL_MAX;
> +
> + if (!des->ops->needs_single_link_version)
> + return;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + if (!link->enabled)
> + continue;
> +
> + if (!link->ser_xlate.en)
> + continue;
> +
> + *min = *max = link->version;
> +
> + return;
> + }
> +}
> +
> +static int max_des_ser_attach_addr(struct max_des_priv *priv, u32 chan_id,
> + u16 addr, u16 alias)
> +{
> + struct max_des *des = priv->des;
> + struct max_des_link *link = &des->links[chan_id];
> + int i, min, max;
> + int ret = 0;
> +
> + max_des_ser_find_version_range(des, &min, &max);
> +
> + if (link->ser_xlate.en) {
> + dev_err(priv->dev, "Serializer for link %u already bound\n",
> + link->index);
> + return -EINVAL;
> + }
> +
> + for (i = max; i >= min; i--) {
> + if (!(des->ops->versions & BIT(i)))
> + continue;
> +
> + if (des->ops->set_link_version) {
> + ret = des->ops->set_link_version(des, link, i);
> + if (ret)
> + return ret;
> + }
> +
> + ret = max_des_init_link_ser_xlate(priv, link, priv->client->adapter,
> + addr, alias);
> + if (!ret)
> + break;
> + }
> +
> + if (ret) {
> + dev_err(priv->dev, "Cannot find serializer for link %u\n",
> + link->index);
> + return -ENOENT;
> + }
> +
> + link->version = i;
> + link->ser_xlate.src = alias;
> + link->ser_xlate.dst = addr;
> + link->ser_xlate.en = true;
> +
> + return 0;
> +}
> +
> +static int max_des_ser_atr_attach_addr(struct i2c_atr *atr, u32 chan_id,
> + u16 addr, u16 alias)
> +{
> + struct max_des_priv *priv = i2c_atr_get_driver_data(atr);
> +
> + return max_des_ser_attach_addr(priv, chan_id, addr, alias);
> +}
> +
> +static void max_des_ser_atr_detach_addr(struct i2c_atr *atr, u32 chan_id, u16 addr)
> +{
> + /* Don't do anything. */
> +}
> +
> +static const struct i2c_atr_ops max_des_i2c_atr_ops = {
> + .attach_addr = max_des_ser_atr_attach_addr,
> + .detach_addr = max_des_ser_atr_detach_addr,
> +};
> +
> +static void max_des_i2c_atr_deinit(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + /* Deleting adapters that haven't been added does no harm. */
> + i2c_atr_del_adapter(priv->atr, link->index);
> + }
> +
> + i2c_atr_delete(priv->atr);
> +}
> +
> +static int max_des_i2c_atr_init(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + unsigned int mask = 0;
> + unsigned int i;
> + int ret;
> +
> + if (!i2c_check_functionality(priv->client->adapter,
> + I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
> + return -ENODEV;
> +
> + priv->atr = i2c_atr_new(priv->client->adapter, priv->dev,
> + &max_des_i2c_atr_ops, des->ops->num_links,
> + I2C_ATR_F_STATIC | I2C_ATR_F_PASSTHROUGH);
> + if (IS_ERR(priv->atr))
> + return PTR_ERR(priv->atr);
> +
> + i2c_atr_set_driver_data(priv->atr, priv);
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> + struct i2c_atr_adap_desc desc = {
> + .chan_id = i,
> + };
> +
> + if (!link->enabled)
> + continue;
> +
> + ret = i2c_atr_add_adapter(priv->atr, &desc);
> + if (ret)
> + goto err_add_adapters;
> + }
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + if (!link->enabled)
> + continue;
> +
> + mask |= BIT(link->index);
> + }
> +
> + return des->ops->select_links(des, mask);
> +
> +err_add_adapters:
> + max_des_i2c_atr_deinit(priv);
> +
> + return ret;
> +}
> +
> +static void max_des_i2c_mux_deinit(struct max_des_priv *priv)
> +{
> + i2c_mux_del_adapters(priv->mux);
> + bus_unregister_notifier(&i2c_bus_type, &priv->i2c_nb);
> +}
> +
> +static int max_des_i2c_mux_bus_notifier_call(struct notifier_block *nb,
> + unsigned long event, void *device)
> +{
> + struct max_des_priv *priv = container_of(nb, struct max_des_priv, i2c_nb);
> + struct device *dev = device;
> + struct i2c_client *client;
> + u32 chan_id;
> +
> + /*
> + * Ideally, we would want to negotiate the GMSL version on
> + * BUS_NOTIFY_ADD_DEVICE, but the adapters list is only populated with
> + * the new adapter after BUS_NOTIFY_ADD_DEVICE is issued.
> + */
> + if (event != BUS_NOTIFY_BIND_DRIVER)
> + return NOTIFY_DONE;
> +
> + client = i2c_verify_client(dev);
> + if (!client)
> + return NOTIFY_DONE;
> +
> + for (chan_id = 0; chan_id < priv->mux->max_adapters; ++chan_id) {
> + if (client->adapter == priv->mux->adapter[chan_id])
> + break;
> + }
> +
> + if (chan_id == priv->mux->max_adapters)
> + return NOTIFY_DONE;
> +
> + max_des_ser_attach_addr(priv, chan_id, client->addr, client->addr);
> +
> + return NOTIFY_DONE;
> +}
> +
> +static int max_des_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
> +{
> + struct max_des_priv *priv = i2c_mux_priv(muxc);
> + struct max_des *des = priv->des;
> +
> + if (!des->ops->select_links)
> + return 0;
> +
> + return des->ops->select_links(des, BIT(chan));
> +}
> +
> +static int max_des_i2c_mux_init(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + u32 flags = I2C_MUX_LOCKED;
> + unsigned int i;
> + int ret;
> +
> + if (des->ops->num_links == 1)
> + flags |= I2C_MUX_GATE;
> +
> + priv->mux = i2c_mux_alloc(priv->client->adapter, priv->dev,
> + des->ops->num_links, 0, flags,
> + max_des_i2c_mux_select, NULL);
> + if (!priv->mux)
> + return -ENOMEM;
> +
> + priv->mux->priv = priv;
> +
> + priv->i2c_nb.notifier_call = max_des_i2c_mux_bus_notifier_call;
> + ret = bus_register_notifier(&i2c_bus_type, &priv->i2c_nb);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + if (!link->enabled)
> + continue;
> +
> + ret = i2c_mux_add_adapter(priv->mux, 0, i);
> + if (ret)
> + goto err_add_adapters;
> + }
> +
> + return 0;
> +
> +err_add_adapters:
> + max_des_i2c_mux_deinit(priv);
> +
> + return ret;
> +}
> +
> +static void max_des_i2c_adapter_deinit(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> +
> + if (des->ops->use_atr)
> + return max_des_i2c_atr_deinit(priv);
> + else
> + return max_des_i2c_mux_deinit(priv);
> +}
> +
> +static int max_des_i2c_adapter_init(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> +
> + if (des->ops->use_atr)
> + return max_des_i2c_atr_init(priv);
> + else
> + return max_des_i2c_mux_init(priv);
> +
> + return 0;
> +}
> +
> +static int max_des_set_tpg_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_format *format)
> +{
> + struct v4l2_mbus_framefmt *fmt = &format->format;
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + const struct max_serdes_tpg_entry *entry;
> + struct v4l2_fract *in;
> +
> + if (format->stream != MAX_SERDES_TPG_STREAM)
> + return -EINVAL;
> +
> + entry = max_des_find_tpg_entry(des, 0, fmt->width, fmt->height,
> + fmt->code, 0, 0);
> + if (!entry)
> + return -EINVAL;
> +
> + in = v4l2_subdev_state_get_interval(state, format->pad, format->stream);
> + if (!in)
> + return -EINVAL;
> +
> + in->numerator = entry->interval.numerator;
> + in->denominator = entry->interval.denominator;
> +
> + return 0;
> +}
> +
> +static int max_des_set_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_format *format)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + struct v4l2_mbus_framefmt *fmt;
> + int ret;
> +
> + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && des->active)
> + return -EBUSY;
> +
> + /* No transcoding, source and sink formats must match. */
> + if (max_des_pad_is_source(des, format->pad))
> + return v4l2_subdev_get_fmt(sd, state, format);
> +
> + if (max_des_pad_is_tpg(des, format->pad)) {
> + ret = max_des_set_tpg_fmt(sd, state, format);
> + if (ret)
> + return ret;
> + }
> +
> + fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
> + if (!fmt)
> + return -EINVAL;
> +
> + *fmt = format->format;
> +
> + fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
> + format->stream);
> + if (!fmt)
> + return -EINVAL;
> +
> + *fmt = format->format;
> +
> + return 0;
> +}
> +
> +static int max_des_enum_frame_interval(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_frame_interval_enum *fie)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + const struct max_serdes_tpg_entry *entry;
> +
> + if (!max_des_pad_is_tpg(des, fie->pad) ||
> + fie->stream != MAX_SERDES_TPG_STREAM)
> + return -EINVAL;
> +
> + entry = max_des_find_tpg_entry(des, fie->index, fie->width, fie->height,
> + fie->code, fie->interval.denominator,
> + fie->interval.numerator);
> + if (!entry)
> + return -EINVAL;
> +
> + fie->interval.numerator = entry->interval.numerator;
> + fie->interval.denominator = entry->interval.denominator;
> +
> + return 0;
> +}
> +
> +static int max_des_set_frame_interval(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_frame_interval *fi)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + const struct max_serdes_tpg_entry *entry;
> + struct v4l2_mbus_framefmt *fmt;
> + struct v4l2_fract *in;
> +
> + if (!max_des_pad_is_tpg(des, fi->pad) ||
> + fi->stream != MAX_SERDES_TPG_STREAM)
> + return -EINVAL;
> +
> + if (fi->which == V4L2_SUBDEV_FORMAT_ACTIVE && des->active)
> + return -EBUSY;
> +
> + fmt = v4l2_subdev_state_get_format(state, fi->pad, fi->stream);
> + if (!fmt)
> + return -EINVAL;
> +
> + entry = max_des_find_tpg_entry(des, 0, fmt->width, fmt->height,
> + fmt->code, fi->interval.denominator,
> + fi->interval.numerator);
> + if (!entry)
> + return -EINVAL;
> +
> + in = v4l2_subdev_state_get_interval(state, fi->pad, fi->stream);
> + if (!in)
> + return -EINVAL;
> +
> + in->numerator = fi->interval.numerator;
> + in->denominator = fi->interval.denominator;
> +
> + return 0;
> +}
> +
> +static int max_des_log_status(struct v4l2_subdev *sd)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + unsigned int i, j;
> + int ret;
> +
> + v4l2_info(sd, "active: %u\n", des->active);
> + v4l2_info(sd, "mode: %s", max_serdes_gmsl_mode_str(des->mode));
> + if (des->ops->set_tpg) {
> + const struct max_serdes_tpg_entry *entry = des->tpg_entry;
> +
> + if (entry) {
> + v4l2_info(sd, "tpg: %ux%u@...%u, code: %u, dt: %u, bpp: %u\n",
> + entry->width, entry->height,
> + entry->interval.numerator,
> + entry->interval.denominator,
> + entry->code, entry->dt, entry->bpp);
> + } else {
> + v4l2_info(sd, "tpg: disabled\n");
> + }
> + }
> + if (des->ops->log_status) {
> + ret = des->ops->log_status(des);
> + if (ret)
> + return ret;
> + }
> + v4l2_info(sd, "\n");
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + v4l2_info(sd, "link: %u\n", link->index);
> + v4l2_info(sd, "\tenabled: %u\n", link->enabled);
> +
> + if (!link->enabled) {
> + v4l2_info(sd, "\n");
> + continue;
> + }
> +
> + v4l2_info(sd, "\tversion: %s\n", max_serdes_gmsl_version_str(link->version));
> + v4l2_info(sd, "\tser_xlate: en: %u, src: 0x%02x dst: 0x%02x\n",
> + link->ser_xlate.en, link->ser_xlate.src,
> + link->ser_xlate.dst);
> + v4l2_info(sd, "\n");
> + }
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + struct max_des_pipe *pipe = &des->pipes[i];
> +
> + v4l2_info(sd, "pipe: %u\n", pipe->index);
> + v4l2_info(sd, "\tenabled: %u\n", pipe->enabled);
> + if (pipe->phy_id == des->ops->num_phys ||
> + (priv->unused_phy && pipe->phy_id == priv->unused_phy->index))
> + v4l2_info(sd, "\tphy_id: invalid\n");
> + else
> + v4l2_info(sd, "\tphy_id: %u\n", pipe->phy_id);
> + v4l2_info(sd, "\tlink_id: %u\n", pipe->link_id);
> + if (des->ops->set_pipe_stream_id)
> + v4l2_info(sd, "\tstream_id: %u\n", pipe->stream_id);
> + if (des->ops->set_pipe_mode) {
> + v4l2_info(sd, "\tdbl8: %u\n", pipe->mode.dbl8);
> + v4l2_info(sd, "\tdbl8mode: %u\n", pipe->mode.dbl8mode);
> + v4l2_info(sd, "\tdbl10: %u\n", pipe->mode.dbl10);
> + v4l2_info(sd, "\tdbl10mode: %u\n", pipe->mode.dbl10mode);
> + v4l2_info(sd, "\tdbl12: %u\n", pipe->mode.dbl12);
> + }
> + if (des->ops->set_pipe_remap) {
> + v4l2_info(sd, "\tremaps: %u\n", pipe->num_remaps);
> + for (j = 0; j < pipe->num_remaps; j++) {
> + struct max_des_remap *remap = &pipe->remaps[j];
> +
> + v4l2_info(sd, "\t\tremap: from: vc: %u, dt: 0x%02x\n",
> + remap->from_vc, remap->from_dt);
> + v4l2_info(sd, "\t\t to: vc: %u, dt: 0x%02x, phy: %u\n",
> + remap->to_vc, remap->to_dt, remap->phy);
> + }
> + }
> + if (des->ops->set_pipe_vc_remap) {
> + v4l2_info(sd, "\tvc_remaps: %u\n", pipe->num_vc_remaps);
> + for (j = 0; j < pipe->num_vc_remaps; j++) {
> + v4l2_info(sd, "\t\tvc_remap: src: %u, dst: %u\n",
> + pipe->vc_remaps[j].src, pipe->vc_remaps[j].dst);
> + }
> + }
> + if (des->ops->log_pipe_status) {
> + ret = des->ops->log_pipe_status(des, pipe);
> + if (ret)
> + return ret;
> + }
> + v4l2_info(sd, "\n");
> + }
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + struct max_des_phy *phy = &des->phys[i];
> +
> + v4l2_info(sd, "phy: %u\n", phy->index);
> + v4l2_info(sd, "\tenabled: %u\n", phy->enabled);
> +
> + if (!phy->enabled) {
> + v4l2_info(sd, "\n");
> + continue;
> + }
> +
> + v4l2_info(sd, "\tlink_frequency: %llu\n", phy->link_frequency);
> + v4l2_info(sd, "\tnum_data_lanes: %u\n", phy->mipi.num_data_lanes);
> + v4l2_info(sd, "\tclock_lane: %u\n", phy->mipi.clock_lane);
> + if (des->ops->set_phy_mode) {
> + v4l2_info(sd, "\talt_mem_map8: %u\n", phy->mode.alt_mem_map8);
> + v4l2_info(sd, "\talt2_mem_map8: %u\n", phy->mode.alt2_mem_map8);
> + v4l2_info(sd, "\talt_mem_map10: %u\n", phy->mode.alt_mem_map10);
> + v4l2_info(sd, "\talt_mem_map12: %u\n", phy->mode.alt_mem_map12);
> + }
> + if (des->ops->log_phy_status) {
> + ret = des->ops->log_phy_status(des, phy);
> + if (ret)
> + return ret;
> + }
> + v4l2_info(sd, "\n");
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct max_des_priv *priv = ctrl_to_priv(ctrl->handler);
> + struct max_des *des = priv->des;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_TEST_PATTERN:
> + des->tpg_pattern = ctrl->val;
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int max_des_get_frame_desc_state(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_mbus_frame_desc *fd,
> + unsigned int pad)
> +{
> + struct max_des_remap_context context = { 0 };
> + struct max_des_priv *priv = sd_to_priv(sd);
> + struct v4l2_subdev_route *route;
> + int ret;
> +
> + fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> +
> + ret = max_des_populate_remap_context(priv, &context, state);
> + if (ret)
> + return ret;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> + unsigned int dst_vc_id;
> +
> + if (pad != route->source_pad)
> + continue;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + ret = max_des_get_src_dst_vc_id(&context, hw.pipe->index, hw.phy->index,
> + hw.entry.bus.csi2.vc, &dst_vc_id);
> + if (ret)
> + return ret;
> +
> + hw.entry.bus.csi2.vc = dst_vc_id;
> + hw.entry.stream = route->source_stream;
> +
> + fd->entry[fd->num_entries++] = hw.entry;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
> + struct v4l2_mbus_frame_desc *fd)
> +{
> + struct max_des_priv *priv = sd_to_priv(sd);
> + struct v4l2_subdev_state *state;
> + int ret;
> +
> + state = v4l2_subdev_lock_and_get_active_state(&priv->sd);
> +
> + ret = max_des_get_frame_desc_state(sd, state, fd, pad);
> +
> + v4l2_subdev_unlock_state(state);
> +
> + return ret;
> +}
> +
> +static int max_des_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
> + struct v4l2_mbus_config *cfg)
> +{
> + struct max_des_priv *priv = sd_to_priv(sd);
> + struct max_des *des = priv->des;
> + struct max_des_phy *phy;
> +
> + phy = max_des_pad_to_phy(des, pad);
> + if (!phy)
> + return -EINVAL;
> +
> + cfg->type = phy->bus_type;
> + cfg->bus.mipi_csi2 = phy->mipi;
> + cfg->link_freq = phy->link_frequency;
> +
> + return 0;
> +}
> +
> +static int max_des_set_tpg_routing(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_krouting *routing)
> +{
> + struct max_des_priv *priv = sd_to_priv(sd);
> + struct max_des *des = priv->des;
> + const struct max_serdes_tpg_entry *entry;
> + struct v4l2_mbus_framefmt fmt = { 0 };
> + int ret;
> +
> + ret = max_serdes_validate_tpg_routing(routing);
> + if (ret)
> + return ret;
> +
> + entry = &des->ops->tpg_entries.entries[0];
> +
> + fmt.width = entry->width;
> + fmt.height = entry->height;
> + fmt.code = entry->code;
> +
> + return v4l2_subdev_set_routing_with_fmt(sd, state, routing, &fmt);
> +}
> +
> +static int max_des_set_routing(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + enum v4l2_subdev_format_whence which,
> + struct v4l2_subdev_krouting *routing)
> +{
> + struct max_des_priv *priv = sd_to_priv(sd);
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + bool is_tpg = false;
> + int ret;
> +
> + if (which == V4L2_SUBDEV_FORMAT_ACTIVE && des->active)
> + return -EBUSY;
> +
> + ret = v4l2_subdev_routing_validate(sd, routing,
> + V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 |
> + V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX);
> + if (ret)
> + return ret;
> +
> + for_each_active_route(routing, route) {
> + if (max_des_pad_is_tpg(des, route->sink_pad)) {
> + is_tpg = true;
> + break;
> + }
> + }
> +
> + if (is_tpg)
> + return max_des_set_tpg_routing(sd, state, routing);
> +
> + return v4l2_subdev_set_routing(sd, state, routing);
> +}
> +
> +static int max_des_update_link(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct max_des_link *link,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + struct max_des_pipe *pipe;
> + int ret;
> +
> + pipe = max_des_find_link_pipe(des, link);
> + if (!pipe)
> + return -ENOENT;
> +
> + ret = max_des_update_pipe(priv, context, pipe, state, streams_masks);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int max_des_update_tpg(struct max_des_priv *priv,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + const struct max_serdes_tpg_entry *entry = NULL;
> + struct max_des *des = priv->des;
> + struct v4l2_subdev_route *route;
> + int ret;
> +
> + for_each_active_route(&state->routing, route) {
> + struct max_des_route_hw hw;
> +
> + if (!(BIT_ULL(route->sink_stream) & streams_masks[route->sink_pad]))
> + continue;
> +
> + ret = max_des_route_to_hw(priv, state, route, &hw);
> + if (ret)
> + return ret;
> +
> + if (!hw.is_tpg)
> + continue;
> +
> + entry = max_des_find_state_tpg_entry(des, state, route->sink_pad);
> + break;
> + }
> +
> + if (entry == des->tpg_entry)
> + return 0;
> +
> + ret = des->ops->set_tpg(des, entry);
> + if (ret)
> + return ret;
> +
> + des->tpg_entry = entry;
> +
> + return 0;
> +}
> +
> +static int max_des_update_active(struct max_des_priv *priv, u64 *streams_masks,
> + bool expected_active)
> +{
> + struct max_des *des = priv->des;
> + bool active = false;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + struct max_des_phy *phy = &des->phys[i];
> + u32 pad = max_des_phy_to_pad(des, phy);
> +
> + if (streams_masks[pad]) {
> + active = true;
> + break;
> + }
> + }
> +
> + if (active != expected_active || des->active == active)
> + return 0;
> +
> + if (des->ops->set_enable) {
> + ret = des->ops->set_enable(des, active);
> + if (ret)
> + return ret;
> + }
> +
> + des->active = active;
> +
> + return 0;
> +}
> +
> +static int max_des_update_links(struct max_des_priv *priv,
> + struct max_des_remap_context *context,
> + struct v4l2_subdev_state *state,
> + u64 *streams_masks)
> +{
> + struct max_des *des = priv->des;
> + unsigned int failed_update_link_id = des->ops->num_links;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + ret = max_des_update_link(priv, context, link, state,
> + streams_masks);
> + if (ret) {
> + failed_update_link_id = i;
> + goto err;
> + }
> + }
> +
> + return 0;
> +
> +err:
> + for (i = 0; i < failed_update_link_id; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + max_des_update_link(priv, context, link, state,
> + priv->streams_masks);
> + }
> +
> + return ret;
> +}
> +
> +static int max_des_enable_disable_streams(struct max_des_priv *priv,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 updated_streams_mask,
> + bool enable)
> +{
> + struct max_des *des = priv->des;
> +
> + return max_serdes_xlate_enable_disable_streams(priv->sources, 0, state,
> + pad, updated_streams_mask, 0,
> + des->ops->num_links, enable);
> +}
> +
> +static int max_des_update_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 updated_streams_mask, bool enable)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des_remap_context context = { 0 };
> + struct max_des_mode_context mode_context = { 0 };
> + struct max_des *des = priv->des;
> + unsigned int num_pads = max_des_num_pads(des);
> + u64 *streams_masks;
> + int ret;
> +
> + ret = max_des_populate_remap_context(priv, &context, state);
> + if (ret)
> + return ret;
> +
> + ret = max_des_populate_mode_context(priv, &mode_context, state, context.mode);
> + if (ret)
> + return ret;
> +
> + ret = max_serdes_get_streams_masks(priv->dev, state, pad, updated_streams_mask,
> + num_pads, priv->streams_masks, &streams_masks,
> + enable);
> + if (ret)
> + return ret;
> +
> + ret = max_des_set_pipes_phy(priv, &context);
> + if (ret)
> + goto err_free_streams_masks;
> +
> + ret = max_des_set_tunnel(priv, &context);
> + if (ret)
> + goto err_free_streams_masks;
> +
> + ret = max_des_set_modes(priv, &mode_context);
> + if (ret)
> + goto err_free_streams_masks;
> +
> + ret = max_des_set_vc_remaps(priv, &context, state, streams_masks);
> + if (ret)
> + return ret;
> +
> + ret = max_des_set_pipes_stream_id(priv);
> + if (ret)
> + goto err_free_streams_masks;
> +
> + if (!enable) {
> + ret = max_des_enable_disable_streams(priv, state, pad,
> + updated_streams_mask, enable);
> + if (ret)
> + goto err_free_streams_masks;
> + }
> +
> + ret = max_des_update_active(priv, streams_masks, false);
> + if (ret)
> + goto err_revert_streams_disable;
> +
> + ret = max_des_update_links(priv, &context, state, streams_masks);
> + if (ret)
> + goto err_revert_active_disable;
> +
> + ret = max_des_update_tpg(priv, state, streams_masks);
> + if (ret)
> + goto err_revert_links_update;
> +
> + ret = max_des_update_active(priv, streams_masks, true);
> + if (ret)
> + goto err_revert_tpg_update;
> +
> + if (enable) {
> + ret = max_des_enable_disable_streams(priv, state, pad,
> + updated_streams_mask, enable);
> + if (ret)
> + goto err_revert_active_enable;
> + }
> +
> + devm_kfree(priv->dev, priv->streams_masks);
> + priv->streams_masks = streams_masks;
> +
> + return 0;
> +
> +err_revert_active_enable:
> + max_des_update_active(priv, priv->streams_masks, false);
> +
> +err_revert_tpg_update:
> + max_des_update_tpg(priv, state, priv->streams_masks);
> +
> +err_revert_links_update:
> + max_des_update_links(priv, &context, state, priv->streams_masks);
> +
> +err_revert_active_disable:
> + max_des_update_active(priv, priv->streams_masks, true);
> +
> +err_revert_streams_disable:
> + if (!enable)
> + max_des_enable_disable_streams(priv, state, pad,
> + updated_streams_mask, !enable);
> +
> +err_free_streams_masks:
> + devm_kfree(priv->dev, streams_masks);
> +
> + return ret;
> +}
> +
> +static int max_des_enable_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask)
> +{
> + return max_des_update_streams(sd, state, pad, streams_mask, true);
> +}
> +
> +static int max_des_disable_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask)
> +{
> + return max_des_update_streams(sd, state, pad, streams_mask, false);
> +}
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int max_des_g_register(struct v4l2_subdev *sd,
> + struct v4l2_dbg_register *reg)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> + unsigned int val;
> + int ret;
> +
> + ret = des->ops->reg_read(des, reg->reg, &val);
> + if (ret)
> + return ret;
> +
> + reg->val = val;
> + reg->size = 1;
> +
> + return 0;
> +}
> +
> +static int max_des_s_register(struct v4l2_subdev *sd,
> + const struct v4l2_dbg_register *reg)
> +{
> + struct max_des_priv *priv = v4l2_get_subdevdata(sd);
> + struct max_des *des = priv->des;
> +
> + return des->ops->reg_write(des, reg->reg, reg->val);
> +}
> +#endif
> +
> +static const struct v4l2_subdev_core_ops max_des_core_ops = {
> + .log_status = max_des_log_status,
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> + .g_register = max_des_g_register,
> + .s_register = max_des_s_register,
> +#endif
> +};
> +
> +static const struct v4l2_ctrl_ops max_des_ctrl_ops = {
> + .s_ctrl = max_des_s_ctrl,
> +};
> +
> +static const struct v4l2_subdev_pad_ops max_des_pad_ops = {
> + .enable_streams = max_des_enable_streams,
> + .disable_streams = max_des_disable_streams,
> +
> + .set_routing = max_des_set_routing,
> + .get_frame_desc = max_des_get_frame_desc,
> +
> + .get_mbus_config = max_des_get_mbus_config,
> +
> + .get_fmt = v4l2_subdev_get_fmt,
> + .set_fmt = max_des_set_fmt,
> +
> + .enum_frame_interval = max_des_enum_frame_interval,
> + .get_frame_interval = v4l2_subdev_get_frame_interval,
> + .set_frame_interval = max_des_set_frame_interval,
> +};
> +
> +static const struct v4l2_subdev_ops max_des_subdev_ops = {
> + .core = &max_des_core_ops,
> + .pad = &max_des_pad_ops,
> +};
> +
> +static const struct media_entity_operations max_des_media_ops = {
> + .link_validate = v4l2_subdev_link_validate,
> + .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
> +};
> +
> +static int max_des_notify_bound(struct v4l2_async_notifier *nf,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_connection *base_asc)
> +{
> + struct max_des_priv *priv = nf_to_priv(nf);
> + struct max_serdes_asc *asc = asc_to_max(base_asc);
> + struct max_serdes_source *source = asc->source;
> + struct max_des *des = priv->des;
> + struct max_des_link *link = &des->links[source->index];
> + u32 pad = max_des_link_to_pad(des, link);
> + int ret;
> +
> + ret = media_entity_get_fwnode_pad(&subdev->entity,
> + source->ep_fwnode,
> + MEDIA_PAD_FL_SOURCE);
> + if (ret < 0) {
> + dev_err(priv->dev, "Failed to find pad for %s\n", subdev->name);
> + return ret;
> + }
> +
> + source->sd = subdev;
> + source->pad = ret;
> +
> + ret = media_create_pad_link(&source->sd->entity, source->pad,
> + &priv->sd.entity, pad,
> + MEDIA_LNK_FL_ENABLED |
> + MEDIA_LNK_FL_IMMUTABLE);
> + if (ret) {
> + dev_err(priv->dev, "Unable to link %s:%u -> %s:%u\n",
> + source->sd->name, source->pad, priv->sd.name, pad);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void max_des_notify_unbind(struct v4l2_async_notifier *nf,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_connection *base_asc)
> +{
> + struct max_serdes_asc *asc = asc_to_max(base_asc);
> + struct max_serdes_source *source = asc->source;
> +
> + source->sd = NULL;
> +}
> +
> +static const struct v4l2_async_notifier_operations max_des_notify_ops = {
> + .bound = max_des_notify_bound,
> + .unbind = max_des_notify_unbind,
> +};
> +
> +static int max_des_v4l2_notifier_register(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + v4l2_async_subdev_nf_init(&priv->nf, &priv->sd);
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> + struct max_serdes_source *source;
> + struct max_serdes_asc *asc;
> +
> + if (!link->enabled)
> + continue;
> +
> + source = max_des_get_link_source(priv, link);
> + if (!source->ep_fwnode)
> + continue;
> +
> + asc = v4l2_async_nf_add_fwnode(&priv->nf, source->ep_fwnode,
> + struct max_serdes_asc);
> + if (IS_ERR(asc)) {
> + dev_err(priv->dev,
> + "Failed to add subdev for source %u: %pe", i,
> + asc);
> +
> + v4l2_async_nf_cleanup(&priv->nf);
> +
> + return PTR_ERR(asc);
> + }
> +
> + asc->source = source;
> + }
> +
> + priv->nf.ops = &max_des_notify_ops;
> +
> + ret = v4l2_async_nf_register(&priv->nf);
> + if (ret) {
> + dev_err(priv->dev, "Failed to register subdev notifier");
> + v4l2_async_nf_cleanup(&priv->nf);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void max_des_v4l2_notifier_unregister(struct max_des_priv *priv)
> +{
> + v4l2_async_nf_unregister(&priv->nf);
> + v4l2_async_nf_cleanup(&priv->nf);
> +}
> +
> +static int max_des_v4l2_register(struct max_des_priv *priv)
> +{
> + struct v4l2_subdev *sd = &priv->sd;
> + struct max_des *des = priv->des;
> + void *data = i2c_get_clientdata(priv->client);
> + unsigned int num_pads = max_des_num_pads(des);
> + unsigned int i;
> + int ret;
> +
> + v4l2_i2c_subdev_init(sd, priv->client, &max_des_subdev_ops);
> + i2c_set_clientdata(priv->client, data);
> + sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> + sd->entity.ops = &max_des_media_ops;
> + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
> +
Same than for serializer, please initialize some default routes
e.g 0/0 -> 1/0 for simple deserializer such as max96714, 0/0 -> 2/0, 1/0 -> 3/0 for dual one.
> + for (i = 0; i < num_pads; i++) {
> + if (max_des_pad_is_sink(des, i))
> + priv->pads[i].flags = MEDIA_PAD_FL_SINK;
> + else if (max_des_pad_is_source(des, i))
> + priv->pads[i].flags = MEDIA_PAD_FL_SOURCE;
> + else if (max_des_pad_is_tpg(des, i))
> + priv->pads[i].flags = MEDIA_PAD_FL_SINK |
> + MEDIA_PAD_FL_INTERNAL;
> + else
> + return -EINVAL;
> + }
> +
> + v4l2_set_subdevdata(sd, priv);
> +
> + if (des->ops->tpg_patterns) {
> + v4l2_ctrl_handler_init(&priv->ctrl_handler, 1);
> + priv->sd.ctrl_handler = &priv->ctrl_handler;
> +
> + v4l2_ctrl_new_std_menu_items(&priv->ctrl_handler,
> + &max_des_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + MAX_SERDES_TPG_PATTERN_MAX,
> + ~des->ops->tpg_patterns,
> + __ffs(des->ops->tpg_patterns),
> + max_serdes_tpg_patterns);
> + if (priv->ctrl_handler.error) {
> + ret = priv->ctrl_handler.error;
> + goto err_free_ctrl;
> + }
> + }
> +
> + ret = media_entity_pads_init(&sd->entity, num_pads, priv->pads);
> + if (ret)
> + goto err_free_ctrl;
> +
> + ret = max_des_v4l2_notifier_register(priv);
> + if (ret)
> + goto err_media_entity_cleanup;
> +
> + ret = v4l2_subdev_init_finalize(sd);
> + if (ret)
> + goto err_nf_cleanup;
> +
> + ret = v4l2_async_register_subdev(sd);
> + if (ret)
> + goto err_sd_cleanup;
> +
> + return 0;
> +
> +err_sd_cleanup:
> + v4l2_subdev_cleanup(sd);
> +err_nf_cleanup:
> + max_des_v4l2_notifier_unregister(priv);
> +err_media_entity_cleanup:
> + media_entity_cleanup(&sd->entity);
> +err_free_ctrl:
> + v4l2_ctrl_handler_free(&priv->ctrl_handler);
> +
> + return ret;
> +}
> +
> +static void max_des_v4l2_unregister(struct max_des_priv *priv)
> +{
> + struct v4l2_subdev *sd = &priv->sd;
> +
> + v4l2_async_unregister_subdev(sd);
> + v4l2_subdev_cleanup(sd);
> + max_des_v4l2_notifier_unregister(priv);
> + media_entity_cleanup(&sd->entity);
> + v4l2_ctrl_handler_free(&priv->ctrl_handler);
> +}
> +
> +static int max_des_update_pocs(struct max_des_priv *priv, bool enable)
> +{
> + struct max_des *des = priv->des;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> +
> + if (!link->enabled)
> + continue;
> +
> + if (!priv->pocs[i])
> + continue;
> +
> + if (enable)
> + ret = regulator_enable(priv->pocs[i]);
> + else
> + ret = regulator_disable(priv->pocs[i]);
> +
> + if (ret) {
> + dev_err(priv->dev,
> + "Failed to set POC supply to %u: %u\n",
> + enable, ret);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_parse_sink_dt_endpoint(struct max_des_priv *priv,
> + struct max_des_link *link,
> + struct max_serdes_source *source,
> + struct fwnode_handle *fwnode)
> +{
> + struct max_des *des = priv->des;
> + u32 pad = max_des_link_to_pad(des, link);
> + unsigned int index = link->index;
> + struct fwnode_handle *ep;
> + char poc_name[10];
> + int ret;
> +
> + ep = fwnode_graph_get_endpoint_by_id(fwnode, pad, 0, 0);
> + if (!ep)
> + return 0;
> +
> + source->ep_fwnode = fwnode_graph_get_remote_endpoint(ep);
> + fwnode_handle_put(ep);
> + if (!source->ep_fwnode) {
> + dev_err(priv->dev,
> + "Failed to get remote endpoint on port %u\n", pad);
> + return -ENODEV;
> + }
> +
> + snprintf(poc_name, sizeof(poc_name), "port%u-poc", index);
> + priv->pocs[index] = devm_regulator_get_optional(priv->dev, poc_name);
> + if (IS_ERR(priv->pocs[index])) {
> + ret = PTR_ERR(priv->pocs[index]);
> + if (ret != -ENODEV) {
> + dev_err(priv->dev,
> + "Failed to get POC supply on port %u: %d\n",
> + index, ret);
> + goto err_put_source_ep_fwnode;
> + }
> +
> + priv->pocs[index] = NULL;
> + }
> +
> + link->enabled = true;
> +
> + return 0;
> +
> +err_put_source_ep_fwnode:
> + fwnode_handle_put(source->ep_fwnode);
> +
> + return ret;
> +}
> +
> +static int max_des_parse_src_dt_endpoint(struct max_des_priv *priv,
> + struct max_des_phy *phy,
> + struct fwnode_handle *fwnode)
> +{
> + struct max_des *des = priv->des;
> + u32 pad = max_des_phy_to_pad(des, phy);
> + struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = V4L2_MBUS_UNKNOWN };
> + struct v4l2_mbus_config_mipi_csi2 *mipi = &v4l2_ep.bus.mipi_csi2;
> + enum v4l2_mbus_type bus_type;
> + struct fwnode_handle *ep;
> + u64 link_frequency;
> + unsigned int i;
> + int ret;
> +
> + ep = fwnode_graph_get_endpoint_by_id(fwnode, pad, 0, 0);
> + if (!ep)
> + return 0;
> +
> + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &v4l2_ep);
> + fwnode_handle_put(ep);
> + if (ret) {
> + dev_err(priv->dev, "Could not parse endpoint on port %u\n", pad);
> + return ret;
> + }
> +
> + bus_type = v4l2_ep.bus_type;
> + if (bus_type != V4L2_MBUS_CSI2_DPHY &&
> + bus_type != V4L2_MBUS_CSI2_CPHY) {
> + v4l2_fwnode_endpoint_free(&v4l2_ep);
> + dev_err(priv->dev, "Unsupported bus-type %u on port %u\n",
> + pad, bus_type);
> + return -EINVAL;
> + }
> +
> + if (v4l2_ep.nr_of_link_frequencies == 0)
> + link_frequency = MAX_DES_LINK_FREQUENCY_DEFAULT;
> + else if (v4l2_ep.nr_of_link_frequencies == 1)
> + link_frequency = v4l2_ep.link_frequencies[0];
> + else
> + ret = -EINVAL;
> +
> + v4l2_fwnode_endpoint_free(&v4l2_ep);
> +
> + if (ret) {
> + dev_err(priv->dev, "Invalid link frequencies %u on port %u\n",
> + v4l2_ep.nr_of_link_frequencies, pad);
> + return -EINVAL;
> + }
> +
> + if (link_frequency < MAX_DES_LINK_FREQUENCY_MIN ||
> + link_frequency > MAX_DES_LINK_FREQUENCY_MAX) {
> + dev_err(priv->dev, "Invalid link frequency %llu on port %u\n",
> + link_frequency, pad);
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < mipi->num_data_lanes; i++) {
> + if (mipi->data_lanes[i] > mipi->num_data_lanes) {
> + dev_err(priv->dev, "Invalid data lane %u on port %u\n",
> + mipi->data_lanes[i], pad);
> + return -EINVAL;
> + }
> + }
> +
> + phy->bus_type = bus_type;
> + phy->mipi = *mipi;
> + phy->link_frequency = link_frequency;
> + phy->enabled = true;
> +
> + return 0;
> +}
> +
> +int max_des_phy_hw_data_lanes(struct max_des *des, struct max_des_phy *phy)
> +{
> + const struct max_serdes_phys_configs *configs = &des->ops->phys_configs;
> + const struct max_serdes_phys_config *config =
> + &configs->configs[des->phys_config];
> +
> + return config->lanes[phy->index];
> +}
> +EXPORT_SYMBOL_GPL(max_des_phy_hw_data_lanes);
> +
> +static int max_des_find_phys_config(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + const struct max_serdes_phys_configs *configs = &des->ops->phys_configs;
> + struct max_des_phy *phy;
> + unsigned int i, j;
> +
> + if (!configs->num_configs)
> + return 0;
> +
> + for (i = 0; i < configs->num_configs; i++) {
> + const struct max_serdes_phys_config *config = &configs->configs[i];
> + bool matching = true;
> +
> + for (j = 0; j < des->ops->num_phys; j++) {
> + phy = &des->phys[j];
> +
> + if (!phy->enabled)
> + continue;
> +
> + if (phy->mipi.num_data_lanes <= config->lanes[j] &&
> + phy->mipi.clock_lane == config->clock_lane[j])
> + continue;
> +
> + matching = false;
> +
> + break;
> + }
> +
> + if (matching)
> + break;
> + }
> +
> + if (i == configs->num_configs) {
> + dev_err(priv->dev, "Invalid lane configuration\n");
> + return -EINVAL;
> + }
> +
> + des->phys_config = i;
> +
> + return 0;
> +}
> +
> +static int max_des_parse_dt(struct max_des_priv *priv)
> +{
> + struct fwnode_handle *fwnode = dev_fwnode(priv->dev);
> + struct max_des *des = priv->des;
> + struct max_des_link *link;
> + struct max_des_pipe *pipe;
> + struct max_des_phy *phy;
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < des->ops->num_phys; i++) {
> + phy = &des->phys[i];
> + phy->index = i;
> +
> + ret = max_des_parse_src_dt_endpoint(priv, phy, fwnode);
> + if (ret)
> + return ret;
> + }
> +
> + ret = max_des_find_phys_config(priv);
> + if (ret)
> + return ret;
> +
> + /* Find an unsed PHY to send unampped data to. */
> + for (i = 0; i < des->ops->num_phys; i++) {
> + phy = &des->phys[i];
> +
> + if (!phy->enabled) {
> + priv->unused_phy = phy;
> + break;
> + }
> + }
> +
> + for (i = 0; i < des->ops->num_pipes; i++) {
> + pipe = &des->pipes[i];
> + pipe->index = i;
> +
> + /*
> + * Serializers can send data on different stream ids over the
> + * same link, and some deserializers support stream id autoselect
> + * allowing them to receive data from all stream ids.
> + * Deserializers that support that feature should enable it.
> + * Deserializers that support per-link stream ids do not need
> + * to assign unique stream ids to each serializer.
> + */
> + if (des->ops->needs_unique_stream_id)
> + pipe->stream_id = i;
> + else
> + pipe->stream_id = 0;
> +
> + /*
> + * We already checked that num_pipes >= num_links.
> + * Set up pipe to receive data from the link with the same index.
> + * This is already the default for most chips, and some of them
> + * don't even support receiving pipe data from a different link.
> + */
> + pipe->link_id = i % des->ops->num_links;
> + }
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + link = &des->links[i];
> + link->index = i;
> + }
> +
> + for (i = 0; i < des->ops->num_links; i++) {
> + struct max_des_link *link = &des->links[i];
> + struct max_serdes_source *source;
> +
> + source = max_des_get_link_source(priv, link);
> + source->index = i;
> +
> + ret = max_des_parse_sink_dt_endpoint(priv, link, source, fwnode);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max_des_allocate(struct max_des_priv *priv)
> +{
> + struct max_des *des = priv->des;
> + unsigned int num_pads = max_des_num_pads(des);
> +
> + des->phys = devm_kcalloc(priv->dev, des->ops->num_phys,
> + sizeof(*des->phys), GFP_KERNEL);
> + if (!des->phys)
> + return -ENOMEM;
> +
> + des->pipes = devm_kcalloc(priv->dev, des->ops->num_pipes,
> + sizeof(*des->pipes), GFP_KERNEL);
> + if (!des->pipes)
> + return -ENOMEM;
> +
> + des->links = devm_kcalloc(priv->dev, des->ops->num_links,
> + sizeof(*des->links), GFP_KERNEL);
> + if (!des->links)
> + return -ENOMEM;
> +
> + priv->sources = devm_kcalloc(priv->dev, des->ops->num_links,
> + sizeof(*priv->sources), GFP_KERNEL);
> + if (!priv->sources)
> + return -ENOMEM;
> +
> + priv->pocs = devm_kcalloc(priv->dev, des->ops->num_links,
> + sizeof(*priv->pocs), GFP_KERNEL);
> + if (!priv->pocs)
> + return -ENOMEM;
> +
> + priv->pads = devm_kcalloc(priv->dev, num_pads,
> + sizeof(*priv->pads), GFP_KERNEL);
> + if (!priv->pads)
> + return -ENOMEM;
> +
> + priv->streams_masks = devm_kcalloc(priv->dev, num_pads,
> + sizeof(*priv->streams_masks),
> + GFP_KERNEL);
> + if (!priv->streams_masks)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +int max_des_probe(struct i2c_client *client, struct max_des *des)
> +{
> + struct device *dev = &client->dev;
> + struct max_des_priv *priv;
> + int ret;
> +
> + if (des->ops->num_phys > MAX_DES_PHYS_NUM)
> + return -E2BIG;
> +
> + if (des->ops->num_pipes > MAX_DES_PIPES_NUM)
> + return -E2BIG;
> +
> + if (des->ops->num_links > des->ops->num_pipes)
> + return -E2BIG;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + if (des->ops->set_link_version && !des->ops->select_links) {
> + dev_err(dev,
> + "Cannot implement .select_link_version() without .select_links()\n");
> + return -EINVAL;
> + }
> +
> + if (hweight_long(des->ops->versions) >= 1 &&
> + !des->ops->set_link_version) {
> + dev_err(dev, "Multiple version without .select_link_version()\n");
> + return -EINVAL;
> + }
> +
> + priv->client = client;
> + priv->dev = dev;
> + priv->des = des;
> + des->priv = priv;
> +
> + ret = max_des_allocate(priv);
> + if (ret)
> + return ret;
> +
> + ret = max_des_parse_dt(priv);
> + if (ret)
> + return ret;
> +
> + ret = max_des_init(priv);
> + if (ret)
> + return ret;
> +
> + ret = max_des_update_pocs(priv, true);
> + if (ret)
> + return ret;
> +
> + ret = max_des_i2c_adapter_init(priv);
> + if (ret)
> + goto err_disable_pocs;
> +
> + ret = max_des_v4l2_register(priv);
> + if (ret)
> + goto err_i2c_adapter_deinit;
> +
> + return 0;
> +
> +err_i2c_adapter_deinit:
> + max_des_i2c_adapter_deinit(priv);
> +
> +err_disable_pocs:
> + max_des_update_pocs(priv, false);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(max_des_probe);
> +
> +int max_des_remove(struct max_des *des)
> +{
> + struct max_des_priv *priv = des->priv;
> +
> + max_des_v4l2_unregister(priv);
> +
> + max_des_i2c_adapter_deinit(priv);
> +
> + max_des_update_pocs(priv, false);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(max_des_remove);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS("I2C_ATR");
> diff --git a/drivers/media/i2c/maxim-serdes/max_des.h b/drivers/media/i2c/maxim-serdes/max_des.h
> new file mode 100644
> index 000000000000..6c86dd79be98
> --- /dev/null
> +++ b/drivers/media/i2c/maxim-serdes/max_des.h
> @@ -0,0 +1,151 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2025 Analog Devices Inc.
> + */
> +
> +#ifndef MAX_DES_H
> +#define MAX_DES_H
> +
> +#include <media/v4l2-mediabus.h>
> +
> +#include "max_serdes.h"
> +
> +#define MAX_DES_DT_VC(dt, vc) (((vc) & 0x3) << 6 | ((dt) & 0x3f))
> +
> +struct max_des_remap {
> + u8 from_dt;
> + u8 from_vc;
> + u8 to_dt;
> + u8 to_vc;
> + u8 phy;
> +};
> +
> +struct max_des_link {
> + unsigned int index;
> + bool enabled;
> + enum max_serdes_gmsl_version version;
> + struct max_serdes_i2c_xlate ser_xlate;
> +};
> +
> +struct max_des_pipe_mode {
> + bool dbl8;
> + bool dbl10;
> + bool dbl12;
> + bool dbl8mode;
> + bool dbl10mode;
> +};
> +
> +struct max_des_pipe {
> + unsigned int index;
> + unsigned int stream_id;
> + unsigned int link_id;
> + unsigned int phy_id;
> + struct max_des_remap *remaps;
> + unsigned int num_remaps;
> + struct max_serdes_vc_remap *vc_remaps;
> + unsigned int num_vc_remaps;
> + struct max_des_pipe_mode mode;
> + bool enabled;
> +};
> +
> +struct max_des_phy_mode {
> + bool alt_mem_map8;
> + bool alt2_mem_map8;
> + bool alt_mem_map10;
> + bool alt_mem_map12;
> +};
> +
> +struct max_des_phy {
> + unsigned int index;
> + s64 link_frequency;
> + struct v4l2_mbus_config_mipi_csi2 mipi;
> + enum v4l2_mbus_type bus_type;
> + struct max_des_phy_mode mode;
> + bool enabled;
> +};
> +
> +struct max_des;
> +
> +struct max_des_ops {
> + unsigned int num_phys;
> + unsigned int num_pipes;
> + unsigned int num_links;
> + unsigned int num_remaps_per_pipe;
> + unsigned int versions;
> + unsigned int modes;
> + bool fix_tx_ids;
> + bool use_atr;
> + bool needs_single_link_version;
> + bool needs_unique_stream_id;
> +
> + struct max_serdes_phys_configs phys_configs;
> + struct max_serdes_tpg_entries tpg_entries;
> + enum max_serdes_gmsl_mode tpg_mode;
> + unsigned int tpg_patterns;
> +
> + int (*reg_read)(struct max_des *des, unsigned int reg, unsigned int *val);
> + int (*reg_write)(struct max_des *des, unsigned int reg, unsigned int val);
> + int (*log_status)(struct max_des *des);
> + int (*log_pipe_status)(struct max_des *des, struct max_des_pipe *pipe);
> + int (*log_phy_status)(struct max_des *des, struct max_des_phy *phy);
> + int (*set_enable)(struct max_des *des, bool enable);
> + int (*set_tpg)(struct max_des *des, const struct max_serdes_tpg_entry *entry);
> + int (*init)(struct max_des *des);
> + int (*init_phy)(struct max_des *des, struct max_des_phy *phy);
> + int (*set_phy_mode)(struct max_des *des, struct max_des_phy *phy,
> + struct max_des_phy_mode *mode);
> + int (*set_phy_enable)(struct max_des *des, struct max_des_phy *phy,
> + bool active);
> + int (*set_pipe_stream_id)(struct max_des *des, struct max_des_pipe *pipe,
> + unsigned int stream_id);
> + int (*set_pipe_link)(struct max_des *des, struct max_des_pipe *pipe,
> + struct max_des_link *link);
> + int (*set_pipe_phy)(struct max_des *des, struct max_des_pipe *pipe,
> + struct max_des_phy *phy);
> + int (*set_pipe_tunnel_phy)(struct max_des *des, struct max_des_pipe *pipe,
> + struct max_des_phy *phy);
> + int (*set_pipe_enable)(struct max_des *des, struct max_des_pipe *pipe,
> + bool enable);
> + int (*set_pipe_remap)(struct max_des *des, struct max_des_pipe *pipe,
> + unsigned int i, struct max_des_remap *remap);
> + int (*set_pipe_remaps_enable)(struct max_des *des, struct max_des_pipe *pipe,
> + unsigned int mask);
> + int (*set_pipe_vc_remap)(struct max_des *des, struct max_des_pipe *pipe,
> + unsigned int i, struct max_serdes_vc_remap *vc_remap);
> + int (*set_pipe_vc_remaps_enable)(struct max_des *des, struct max_des_pipe *pipe,
> + unsigned int mask);
> + int (*set_pipe_mode)(struct max_des *des, struct max_des_pipe *pipe,
> + struct max_des_pipe_mode *mode);
> + int (*set_pipe_tunnel_enable)(struct max_des *des, struct max_des_pipe *pipe,
> + bool enable);
> + int (*init_link)(struct max_des *des, struct max_des_link *link);
> + int (*select_links)(struct max_des *des, unsigned int mask);
> + int (*set_link_version)(struct max_des *des, struct max_des_link *link,
> + enum max_serdes_gmsl_version version);
> +};
> +
> +struct max_des_priv;
> +
> +struct max_des {
> + struct max_des_priv *priv;
> +
> + const struct max_des_ops *ops;
> +
> + struct max_des_phy *phys;
> + struct max_des_pipe *pipes;
> + struct max_des_link *links;
> + const struct max_serdes_tpg_entry *tpg_entry;
> + enum max_serdes_tpg_pattern tpg_pattern;
> +
> + unsigned int phys_config;
> + enum max_serdes_gmsl_mode mode;
> + bool active;
> +};
> +
> +int max_des_probe(struct i2c_client *client, struct max_des *des);
> +
> +int max_des_remove(struct max_des *des);
> +
> +int max_des_phy_hw_data_lanes(struct max_des *des, struct max_des_phy *phy);
> +
> +#endif // MAX_DES_H
Regards,
--
Julien
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