Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 536 insertions, 0 deletions

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c
new file mode 100644
index 000000000..d7acc94e1
--- /dev/null
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Rockchip ISP1 Driver - CSI-2 Receiver
+ *
+ * Copyright (C) 2019 Collabora, Ltd.
+ * Copyright (C) 2022 Ideas on Board
+ *
+ * Based on Rockchip ISP1 driver by Rockchip Electronics Co., Ltd.
+ * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/lockdep.h>
+#include <linux/phy/phy.h>
+#include <linux/phy/phy-mipi-dphy.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-fwnode.h>
+
+#include "rkisp1-common.h"
+#include "rkisp1-csi.h"
+
+#define RKISP1_CSI_DEV_NAME	RKISP1_DRIVER_NAME "_csi"
+
+#define RKISP1_CSI_DEF_FMT	MEDIA_BUS_FMT_SRGGB10_1X10
+
+static inline struct rkisp1_csi *to_rkisp1_csi(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct rkisp1_csi, sd);
+}
+
+static struct v4l2_mbus_framefmt *
+rkisp1_csi_get_pad_fmt(struct rkisp1_csi *csi,
+		       struct v4l2_subdev_state *sd_state,
+		       unsigned int pad, u32 which)
+{
+	struct v4l2_subdev_state state = {
+		.pads = csi->pad_cfg
+	};
+
+	lockdep_assert_held(&csi->lock);
+
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
+		return v4l2_subdev_get_try_format(&csi->sd, sd_state, pad);
+	else
+		return v4l2_subdev_get_try_format(&csi->sd, &state, pad);
+}
+
+int rkisp1_csi_link_sensor(struct rkisp1_device *rkisp1, struct v4l2_subdev *sd,
+			   struct rkisp1_sensor_async *s_asd,
+			   unsigned int source_pad)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+	int ret;
+
+	s_asd->pixel_rate_ctrl = v4l2_ctrl_find(sd->ctrl_handler,
+						V4L2_CID_PIXEL_RATE);
+	if (!s_asd->pixel_rate_ctrl) {
+		dev_err(rkisp1->dev, "No pixel rate control in subdev %s\n",
+			sd->name);
+		return -EINVAL;
+	}
+
+	/* Create the link from the sensor to the CSI receiver. */
+	ret = media_create_pad_link(&sd->entity, source_pad,
+				    &csi->sd.entity, RKISP1_CSI_PAD_SINK,
+				    !s_asd->index ? MEDIA_LNK_FL_ENABLED : 0);
+	if (ret) {
+		dev_err(csi->rkisp1->dev, "failed to link src pad of %s\n",
+			sd->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rkisp1_csi_config(struct rkisp1_csi *csi,
+			     const struct rkisp1_sensor_async *sensor)
+{
+	struct rkisp1_device *rkisp1 = csi->rkisp1;
+	unsigned int lanes = sensor->lanes;
+	u32 mipi_ctrl;
+
+	if (lanes < 1 || lanes > 4)
+		return -EINVAL;
+
+	mipi_ctrl = RKISP1_CIF_MIPI_CTRL_NUM_LANES(lanes - 1) |
+		    RKISP1_CIF_MIPI_CTRL_SHUTDOWNLANES(0xf) |
+		    RKISP1_CIF_MIPI_CTRL_ERR_SOT_SYNC_HS_SKIP |
+		    RKISP1_CIF_MIPI_CTRL_CLOCKLANE_ENA;
+
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_CTRL, mipi_ctrl);
+
+	/* V12 could also use a newer csi2-host, but we don't want that yet */
+	if (rkisp1->info->isp_ver == RKISP1_V12)
+		rkisp1_write(rkisp1, RKISP1_CIF_ISP_CSI0_CTRL0, 0);
+
+	/* Configure Data Type and Virtual Channel */
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_IMG_DATA_SEL,
+		     RKISP1_CIF_MIPI_DATA_SEL_DT(csi->sink_fmt->mipi_dt) |
+		     RKISP1_CIF_MIPI_DATA_SEL_VC(0));
+
+	/* Clear MIPI interrupts */
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_ICR, ~0);
+
+	/*
+	 * Disable RKISP1_CIF_MIPI_ERR_DPHY interrupt here temporary for
+	 * isp bus may be dead when switch isp.
+	 */
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_IMSC,
+		     RKISP1_CIF_MIPI_FRAME_END | RKISP1_CIF_MIPI_ERR_CSI |
+		     RKISP1_CIF_MIPI_ERR_DPHY |
+		     RKISP1_CIF_MIPI_SYNC_FIFO_OVFLW(0x03) |
+		     RKISP1_CIF_MIPI_ADD_DATA_OVFLW);
+
+	dev_dbg(rkisp1->dev, "\n  MIPI_CTRL 0x%08x\n"
+		"  MIPI_IMG_DATA_SEL 0x%08x\n"
+		"  MIPI_STATUS 0x%08x\n"
+		"  MIPI_IMSC 0x%08x\n",
+		rkisp1_read(rkisp1, RKISP1_CIF_MIPI_CTRL),
+		rkisp1_read(rkisp1, RKISP1_CIF_MIPI_IMG_DATA_SEL),
+		rkisp1_read(rkisp1, RKISP1_CIF_MIPI_STATUS),
+		rkisp1_read(rkisp1, RKISP1_CIF_MIPI_IMSC));
+
+	return 0;
+}
+
+static void rkisp1_csi_enable(struct rkisp1_csi *csi)
+{
+	struct rkisp1_device *rkisp1 = csi->rkisp1;
+	u32 val;
+
+	val = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_CTRL);
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_CTRL,
+		     val | RKISP1_CIF_MIPI_CTRL_OUTPUT_ENA);
+}
+
+static void rkisp1_csi_disable(struct rkisp1_csi *csi)
+{
+	struct rkisp1_device *rkisp1 = csi->rkisp1;
+	u32 val;
+
+	/* Mask and clear interrupts. */
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_IMSC, 0);
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_ICR, ~0);
+
+	val = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_CTRL);
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_CTRL,
+		     val & (~RKISP1_CIF_MIPI_CTRL_OUTPUT_ENA));
+}
+
+static int rkisp1_csi_start(struct rkisp1_csi *csi,
+			    const struct rkisp1_sensor_async *sensor)
+{
+	struct rkisp1_device *rkisp1 = csi->rkisp1;
+	union phy_configure_opts opts;
+	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
+	s64 pixel_clock;
+	int ret;
+
+	ret = rkisp1_csi_config(csi, sensor);
+	if (ret)
+		return ret;
+
+	pixel_clock = v4l2_ctrl_g_ctrl_int64(sensor->pixel_rate_ctrl);
+	if (!pixel_clock) {
+		dev_err(rkisp1->dev, "Invalid pixel rate value\n");
+		return -EINVAL;
+	}
+
+	phy_mipi_dphy_get_default_config(pixel_clock, csi->sink_fmt->bus_width,
+					 sensor->lanes, cfg);
+	phy_set_mode(csi->dphy, PHY_MODE_MIPI_DPHY);
+	phy_configure(csi->dphy, &opts);
+	phy_power_on(csi->dphy);
+
+	rkisp1_csi_enable(csi);
+
+	/*
+	 * CIF spec says to wait for sufficient time after enabling
+	 * the MIPI interface and before starting the sensor output.
+	 */
+	usleep_range(1000, 1200);
+
+	return 0;
+}
+
+static void rkisp1_csi_stop(struct rkisp1_csi *csi)
+{
+	rkisp1_csi_disable(csi);
+
+	phy_power_off(csi->dphy);
+}
+
+irqreturn_t rkisp1_csi_isr(int irq, void *ctx)
+{
+	struct device *dev = ctx;
+	struct rkisp1_device *rkisp1 = dev_get_drvdata(dev);
+	u32 val, status;
+
+	status = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_MIS);
+	if (!status)
+		return IRQ_NONE;
+
+	rkisp1_write(rkisp1, RKISP1_CIF_MIPI_ICR, status);
+
+	/*
+	 * Disable DPHY errctrl interrupt, because this dphy
+	 * erctrl signal is asserted until the next changes
+	 * of line state. This time is may be too long and cpu
+	 * is hold in this interrupt.
+	 */
+	if (status & RKISP1_CIF_MIPI_ERR_CTRL(0x0f)) {
+		val = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_IMSC);
+		rkisp1_write(rkisp1, RKISP1_CIF_MIPI_IMSC,
+			     val & ~RKISP1_CIF_MIPI_ERR_CTRL(0x0f));
+		rkisp1->csi.is_dphy_errctrl_disabled = true;
+	}
+
+	/*
+	 * Enable DPHY errctrl interrupt again, if mipi have receive
+	 * the whole frame without any error.
+	 */
+	if (status == RKISP1_CIF_MIPI_FRAME_END) {
+		/*
+		 * Enable DPHY errctrl interrupt again, if mipi have receive
+		 * the whole frame without any error.
+		 */
+		if (rkisp1->csi.is_dphy_errctrl_disabled) {
+			val = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_IMSC);
+			val |= RKISP1_CIF_MIPI_ERR_CTRL(0x0f);
+			rkisp1_write(rkisp1, RKISP1_CIF_MIPI_IMSC, val);
+			rkisp1->csi.is_dphy_errctrl_disabled = false;
+		}
+	} else {
+		rkisp1->debug.mipi_error++;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* ----------------------------------------------------------------------------
+ * Subdev pad operations
+ */
+
+static int rkisp1_csi_enum_mbus_code(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_state *sd_state,
+				     struct v4l2_subdev_mbus_code_enum *code)
+{
+	struct rkisp1_csi *csi = to_rkisp1_csi(sd);
+	unsigned int i;
+	int pos = 0;
+
+	if (code->pad == RKISP1_CSI_PAD_SRC) {
+		const struct v4l2_mbus_framefmt *sink_fmt;
+
+		if (code->index)
+			return -EINVAL;
+
+		mutex_lock(&csi->lock);
+
+		sink_fmt = rkisp1_csi_get_pad_fmt(csi, sd_state,
+						  RKISP1_CSI_PAD_SINK,
+						  code->which);
+		code->code = sink_fmt->code;
+
+		mutex_unlock(&csi->lock);
+
+		return 0;
+	}
+
+	for (i = 0; ; i++) {
+		const struct rkisp1_mbus_info *fmt =
+			rkisp1_mbus_info_get_by_index(i);
+
+		if (!fmt)
+			return -EINVAL;
+
+		if (!(fmt->direction & RKISP1_ISP_SD_SINK))
+			continue;
+
+		if (code->index == pos) {
+			code->code = fmt->mbus_code;
+			return 0;
+		}
+
+		pos++;
+	}
+
+	return -EINVAL;
+}
+
+static int rkisp1_csi_init_config(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_mbus_framefmt *sink_fmt, *src_fmt;
+
+	sink_fmt = v4l2_subdev_get_try_format(sd, sd_state,
+					      RKISP1_CSI_PAD_SINK);
+	src_fmt = v4l2_subdev_get_try_format(sd, sd_state,
+					     RKISP1_CSI_PAD_SRC);
+
+	sink_fmt->width = RKISP1_DEFAULT_WIDTH;
+	sink_fmt->height = RKISP1_DEFAULT_HEIGHT;
+	sink_fmt->field = V4L2_FIELD_NONE;
+	sink_fmt->code = RKISP1_CSI_DEF_FMT;
+
+	*src_fmt = *sink_fmt;
+
+	return 0;
+}
+
+static int rkisp1_csi_get_fmt(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_state *sd_state,
+			      struct v4l2_subdev_format *fmt)
+{
+	struct rkisp1_csi *csi = to_rkisp1_csi(sd);
+
+	mutex_lock(&csi->lock);
+	fmt->format = *rkisp1_csi_get_pad_fmt(csi, sd_state, fmt->pad,
+					      fmt->which);
+	mutex_unlock(&csi->lock);
+
+	return 0;
+}
+
+static int rkisp1_csi_set_fmt(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_state *sd_state,
+			      struct v4l2_subdev_format *fmt)
+{
+	struct rkisp1_csi *csi = to_rkisp1_csi(sd);
+	const struct rkisp1_mbus_info *mbus_info;
+	struct v4l2_mbus_framefmt *sink_fmt, *src_fmt;
+
+	/* The format on the source pad always matches the sink pad. */
+	if (fmt->pad == RKISP1_CSI_PAD_SRC)
+		return rkisp1_csi_get_fmt(sd, sd_state, fmt);
+
+	mutex_lock(&csi->lock);
+
+	sink_fmt = rkisp1_csi_get_pad_fmt(csi, sd_state, RKISP1_CSI_PAD_SINK,
+					  fmt->which);
+
+	sink_fmt->code = fmt->format.code;
+
+	mbus_info = rkisp1_mbus_info_get_by_code(sink_fmt->code);
+	if (!mbus_info || !(mbus_info->direction & RKISP1_ISP_SD_SINK)) {
+		sink_fmt->code = RKISP1_CSI_DEF_FMT;
+		mbus_info = rkisp1_mbus_info_get_by_code(sink_fmt->code);
+	}
+
+	sink_fmt->width = clamp_t(u32, fmt->format.width,
+				  RKISP1_ISP_MIN_WIDTH,
+				  RKISP1_ISP_MAX_WIDTH);
+	sink_fmt->height = clamp_t(u32, fmt->format.height,
+				   RKISP1_ISP_MIN_HEIGHT,
+				   RKISP1_ISP_MAX_HEIGHT);
+
+	fmt->format = *sink_fmt;
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		csi->sink_fmt = mbus_info;
+
+	/* Propagate the format to the source pad. */
+	src_fmt = rkisp1_csi_get_pad_fmt(csi, sd_state, RKISP1_CSI_PAD_SRC,
+					 fmt->which);
+	*src_fmt = *sink_fmt;
+
+	mutex_unlock(&csi->lock);
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------------
+ * Subdev video operations
+ */
+
+static int rkisp1_csi_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct rkisp1_csi *csi = to_rkisp1_csi(sd);
+	struct rkisp1_device *rkisp1 = csi->rkisp1;
+	struct rkisp1_sensor_async *source_asd;
+	struct media_pad *source_pad;
+	struct v4l2_subdev *source;
+	int ret;
+
+	if (!enable) {
+		v4l2_subdev_call(csi->source, video, s_stream, false);
+
+		rkisp1_csi_stop(csi);
+
+		return 0;
+	}
+
+	source_pad = media_entity_remote_source_pad_unique(&sd->entity);
+	if (IS_ERR(source_pad)) {
+		dev_dbg(rkisp1->dev, "Failed to get source for CSI: %ld\n",
+			PTR_ERR(source_pad));
+		return -EPIPE;
+	}
+
+	source = media_entity_to_v4l2_subdev(source_pad->entity);
+	if (!source) {
+		/* This should really not happen, so is not worth a message. */
+		return -EPIPE;
+	}
+
+	source_asd = container_of(source->asd, struct rkisp1_sensor_async, asd);
+	if (source_asd->mbus_type != V4L2_MBUS_CSI2_DPHY)
+		return -EINVAL;
+
+	mutex_lock(&csi->lock);
+	ret = rkisp1_csi_start(csi, source_asd);
+	mutex_unlock(&csi->lock);
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_call(source, video, s_stream, true);
+	if (ret) {
+		rkisp1_csi_stop(csi);
+		return ret;
+	}
+
+	csi->source = source;
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------------
+ * Registration
+ */
+
+static const struct media_entity_operations rkisp1_csi_media_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static const struct v4l2_subdev_video_ops rkisp1_csi_video_ops = {
+	.s_stream = rkisp1_csi_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops rkisp1_csi_pad_ops = {
+	.enum_mbus_code = rkisp1_csi_enum_mbus_code,
+	.init_cfg = rkisp1_csi_init_config,
+	.get_fmt = rkisp1_csi_get_fmt,
+	.set_fmt = rkisp1_csi_set_fmt,
+};
+
+static const struct v4l2_subdev_ops rkisp1_csi_ops = {
+	.video = &rkisp1_csi_video_ops,
+	.pad = &rkisp1_csi_pad_ops,
+};
+
+int rkisp1_csi_register(struct rkisp1_device *rkisp1)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+	struct v4l2_subdev_state state = {};
+	struct media_pad *pads;
+	struct v4l2_subdev *sd;
+	int ret;
+
+	csi->rkisp1 = rkisp1;
+	mutex_init(&csi->lock);
+
+	sd = &csi->sd;
+	v4l2_subdev_init(sd, &rkisp1_csi_ops);
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	sd->entity.ops = &rkisp1_csi_media_ops;
+	sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+	sd->owner = THIS_MODULE;
+	strscpy(sd->name, RKISP1_CSI_DEV_NAME, sizeof(sd->name));
+
+	pads = csi->pads;
+	pads[RKISP1_CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK |
+					  MEDIA_PAD_FL_MUST_CONNECT;
+	pads[RKISP1_CSI_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE |
+					 MEDIA_PAD_FL_MUST_CONNECT;
+
+	csi->sink_fmt = rkisp1_mbus_info_get_by_code(RKISP1_CSI_DEF_FMT);
+
+	ret = media_entity_pads_init(&sd->entity, RKISP1_CSI_PAD_NUM, pads);
+	if (ret)
+		goto error;
+
+	state.pads = csi->pad_cfg;
+	rkisp1_csi_init_config(sd, &state);
+
+	ret = v4l2_device_register_subdev(&csi->rkisp1->v4l2_dev, sd);
+	if (ret) {
+		dev_err(sd->dev, "Failed to register csi receiver subdev\n");
+		goto error;
+	}
+
+	return 0;
+
+error:
+	media_entity_cleanup(&sd->entity);
+	mutex_destroy(&csi->lock);
+	csi->rkisp1 = NULL;
+	return ret;
+}
+
+void rkisp1_csi_unregister(struct rkisp1_device *rkisp1)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+
+	if (!csi->rkisp1)
+		return;
+
+	v4l2_device_unregister_subdev(&csi->sd);
+	media_entity_cleanup(&csi->sd.entity);
+	mutex_destroy(&csi->lock);
+}
+
+int rkisp1_csi_init(struct rkisp1_device *rkisp1)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+
+	csi->rkisp1 = rkisp1;
+
+	csi->dphy = devm_phy_get(rkisp1->dev, "dphy");
+	if (IS_ERR(csi->dphy))
+		return dev_err_probe(rkisp1->dev, PTR_ERR(csi->dphy),
+				     "Couldn't get the MIPI D-PHY\n");
+
+	phy_init(csi->dphy);
+
+	return 0;
+}
+
+void rkisp1_csi_cleanup(struct rkisp1_device *rkisp1)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+
+	phy_exit(csi->dphy);
+}