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, 929 insertions, 0 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
new file mode 100644
index 000000000..81a060c2f
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -0,0 +1,929 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R-Car LVDS Encoder
+ *
+ * Copyright (C) 2013-2018 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#include "rcar_lvds.h"
+#include "rcar_lvds_regs.h"
+
+struct rcar_lvds;
+
+/* Keep in sync with the LVDCR0.LVMD hardware register values. */
+enum rcar_lvds_mode {
+	RCAR_LVDS_MODE_JEIDA = 0,
+	RCAR_LVDS_MODE_MIRROR = 1,
+	RCAR_LVDS_MODE_VESA = 4,
+};
+
+enum rcar_lvds_link_type {
+	RCAR_LVDS_SINGLE_LINK = 0,
+	RCAR_LVDS_DUAL_LINK_EVEN_ODD_PIXELS = 1,
+	RCAR_LVDS_DUAL_LINK_ODD_EVEN_PIXELS = 2,
+};
+
+#define RCAR_LVDS_QUIRK_LANES		BIT(0)	/* LVDS lanes 1 and 3 inverted */
+#define RCAR_LVDS_QUIRK_GEN3_LVEN	BIT(1)	/* LVEN bit needs to be set on R8A77970/R8A7799x */
+#define RCAR_LVDS_QUIRK_PWD		BIT(2)	/* PWD bit available (all of Gen3 but E3) */
+#define RCAR_LVDS_QUIRK_EXT_PLL		BIT(3)	/* Has extended PLL */
+#define RCAR_LVDS_QUIRK_DUAL_LINK	BIT(4)	/* Supports dual-link operation */
+
+struct rcar_lvds_device_info {
+	unsigned int gen;
+	unsigned int quirks;
+	void (*pll_setup)(struct rcar_lvds *lvds, unsigned int freq);
+};
+
+struct rcar_lvds {
+	struct device *dev;
+	const struct rcar_lvds_device_info *info;
+
+	struct drm_bridge bridge;
+
+	struct drm_bridge *next_bridge;
+	struct drm_panel *panel;
+
+	void __iomem *mmio;
+	struct {
+		struct clk *mod;		/* CPG module clock */
+		struct clk *extal;		/* External clock */
+		struct clk *dotclkin[2];	/* External DU clocks */
+	} clocks;
+
+	struct drm_bridge *companion;
+	enum rcar_lvds_link_type link_type;
+};
+
+#define bridge_to_rcar_lvds(b) \
+	container_of(b, struct rcar_lvds, bridge)
+
+static void rcar_lvds_write(struct rcar_lvds *lvds, u32 reg, u32 data)
+{
+	iowrite32(data, lvds->mmio + reg);
+}
+
+/* -----------------------------------------------------------------------------
+ * PLL Setup
+ */
+
+static void rcar_lvds_pll_setup_gen2(struct rcar_lvds *lvds, unsigned int freq)
+{
+	u32 val;
+
+	if (freq < 39000000)
+		val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
+	else if (freq < 61000000)
+		val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_60M;
+	else if (freq < 121000000)
+		val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_121M;
+	else
+		val = LVDPLLCR_PLLDLYCNT_150M;
+
+	rcar_lvds_write(lvds, LVDPLLCR, val);
+}
+
+static void rcar_lvds_pll_setup_gen3(struct rcar_lvds *lvds, unsigned int freq)
+{
+	u32 val;
+
+	if (freq < 42000000)
+		val = LVDPLLCR_PLLDIVCNT_42M;
+	else if (freq < 85000000)
+		val = LVDPLLCR_PLLDIVCNT_85M;
+	else if (freq < 128000000)
+		val = LVDPLLCR_PLLDIVCNT_128M;
+	else
+		val = LVDPLLCR_PLLDIVCNT_148M;
+
+	rcar_lvds_write(lvds, LVDPLLCR, val);
+}
+
+struct pll_info {
+	unsigned long diff;
+	unsigned int pll_m;
+	unsigned int pll_n;
+	unsigned int pll_e;
+	unsigned int div;
+	u32 clksel;
+};
+
+static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk,
+				     unsigned long target, struct pll_info *pll,
+				     u32 clksel, bool dot_clock_only)
+{
+	unsigned int div7 = dot_clock_only ? 1 : 7;
+	unsigned long output;
+	unsigned long fin;
+	unsigned int m_min;
+	unsigned int m_max;
+	unsigned int m;
+	int error;
+
+	if (!clk)
+		return;
+
+	/*
+	 * The LVDS PLL is made of a pre-divider and a multiplier (strangely
+	 * enough called M and N respectively), followed by a post-divider E.
+	 *
+	 *         ,-----.         ,-----.     ,-----.         ,-----.
+	 * Fin --> | 1/M | -Fpdf-> | PFD | --> | VCO | -Fvco-> | 1/E | --> Fout
+	 *         `-----'     ,-> |     |     `-----'   |     `-----'
+	 *                     |   `-----'               |
+	 *                     |         ,-----.         |
+	 *                     `-------- | 1/N | <-------'
+	 *                               `-----'
+	 *
+	 * The clock output by the PLL is then further divided by a programmable
+	 * divider DIV to achieve the desired target frequency. Finally, an
+	 * optional fixed /7 divider is used to convert the bit clock to a pixel
+	 * clock (as LVDS transmits 7 bits per lane per clock sample).
+	 *
+	 *          ,-------.     ,-----.     |\
+	 * Fout --> | 1/DIV | --> | 1/7 | --> | |
+	 *          `-------'  |  `-----'     | | --> dot clock
+	 *                     `------------> | |
+	 *                                    |/
+	 *
+	 * The /7 divider is optional, it is enabled when the LVDS PLL is used
+	 * to drive the LVDS encoder, and disabled when  used to generate a dot
+	 * clock for the DU RGB output, without using the LVDS encoder.
+	 *
+	 * The PLL allowed input frequency range is 12 MHz to 192 MHz.
+	 */
+
+	fin = clk_get_rate(clk);
+	if (fin < 12000000 || fin > 192000000)
+		return;
+
+	/*
+	 * The comparison frequency range is 12 MHz to 24 MHz, which limits the
+	 * allowed values for the pre-divider M (normal range 1-8).
+	 *
+	 * Fpfd = Fin / M
+	 */
+	m_min = max_t(unsigned int, 1, DIV_ROUND_UP(fin, 24000000));
+	m_max = min_t(unsigned int, 8, fin / 12000000);
+
+	for (m = m_min; m <= m_max; ++m) {
+		unsigned long fpfd;
+		unsigned int n_min;
+		unsigned int n_max;
+		unsigned int n;
+
+		/*
+		 * The VCO operating range is 900 Mhz to 1800 MHz, which limits
+		 * the allowed values for the multiplier N (normal range
+		 * 60-120).
+		 *
+		 * Fvco = Fin * N / M
+		 */
+		fpfd = fin / m;
+		n_min = max_t(unsigned int, 60, DIV_ROUND_UP(900000000, fpfd));
+		n_max = min_t(unsigned int, 120, 1800000000 / fpfd);
+
+		for (n = n_min; n < n_max; ++n) {
+			unsigned long fvco;
+			unsigned int e_min;
+			unsigned int e;
+
+			/*
+			 * The output frequency is limited to 1039.5 MHz,
+			 * limiting again the allowed values for the
+			 * post-divider E (normal value 1, 2 or 4).
+			 *
+			 * Fout = Fvco / E
+			 */
+			fvco = fpfd * n;
+			e_min = fvco > 1039500000 ? 1 : 0;
+
+			for (e = e_min; e < 3; ++e) {
+				unsigned long fout;
+				unsigned long diff;
+				unsigned int div;
+
+				/*
+				 * Finally we have a programable divider after
+				 * the PLL, followed by a an optional fixed /7
+				 * divider.
+				 */
+				fout = fvco / (1 << e) / div7;
+				div = max(1UL, DIV_ROUND_CLOSEST(fout, target));
+				diff = abs(fout / div - target);
+
+				if (diff < pll->diff) {
+					pll->diff = diff;
+					pll->pll_m = m;
+					pll->pll_n = n;
+					pll->pll_e = e;
+					pll->div = div;
+					pll->clksel = clksel;
+
+					if (diff == 0)
+						goto done;
+				}
+			}
+		}
+	}
+
+done:
+	output = fin * pll->pll_n / pll->pll_m / (1 << pll->pll_e)
+	       / div7 / pll->div;
+	error = (long)(output - target) * 10000 / (long)target;
+
+	dev_dbg(lvds->dev,
+		"%pC %lu Hz -> Fout %lu Hz (target %lu Hz, error %d.%02u%%), PLL M/N/E/DIV %u/%u/%u/%u\n",
+		clk, fin, output, target, error / 100,
+		error < 0 ? -error % 100 : error % 100,
+		pll->pll_m, pll->pll_n, pll->pll_e, pll->div);
+}
+
+static void __rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds,
+					unsigned int freq, bool dot_clock_only)
+{
+	struct pll_info pll = { .diff = (unsigned long)-1 };
+	u32 lvdpllcr;
+
+	rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[0], freq, &pll,
+				 LVDPLLCR_CKSEL_DU_DOTCLKIN(0), dot_clock_only);
+	rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[1], freq, &pll,
+				 LVDPLLCR_CKSEL_DU_DOTCLKIN(1), dot_clock_only);
+	rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.extal, freq, &pll,
+				 LVDPLLCR_CKSEL_EXTAL, dot_clock_only);
+
+	lvdpllcr = LVDPLLCR_PLLON | pll.clksel | LVDPLLCR_CLKOUT
+		 | LVDPLLCR_PLLN(pll.pll_n - 1) | LVDPLLCR_PLLM(pll.pll_m - 1);
+
+	if (pll.pll_e > 0)
+		lvdpllcr |= LVDPLLCR_STP_CLKOUTE | LVDPLLCR_OUTCLKSEL
+			 |  LVDPLLCR_PLLE(pll.pll_e - 1);
+
+	if (dot_clock_only)
+		lvdpllcr |= LVDPLLCR_OCKSEL;
+
+	rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);
+
+	if (pll.div > 1)
+		/*
+		 * The DIVRESET bit is a misnomer, setting it to 1 deasserts the
+		 * divisor reset.
+		 */
+		rcar_lvds_write(lvds, LVDDIV, LVDDIV_DIVSEL |
+				LVDDIV_DIVRESET | LVDDIV_DIV(pll.div - 1));
+	else
+		rcar_lvds_write(lvds, LVDDIV, 0);
+}
+
+static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq)
+{
+	__rcar_lvds_pll_setup_d3_e3(lvds, freq, false);
+}
+
+/* -----------------------------------------------------------------------------
+ * Clock - D3/E3 only
+ */
+
+int rcar_lvds_pclk_enable(struct drm_bridge *bridge, unsigned long freq)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+	int ret;
+
+	if (WARN_ON(!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)))
+		return -ENODEV;
+
+	dev_dbg(lvds->dev, "enabling LVDS PLL, freq=%luHz\n", freq);
+
+	ret = clk_prepare_enable(lvds->clocks.mod);
+	if (ret < 0)
+		return ret;
+
+	__rcar_lvds_pll_setup_d3_e3(lvds, freq, true);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_pclk_enable);
+
+void rcar_lvds_pclk_disable(struct drm_bridge *bridge)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	if (WARN_ON(!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)))
+		return;
+
+	dev_dbg(lvds->dev, "disabling LVDS PLL\n");
+
+	rcar_lvds_write(lvds, LVDPLLCR, 0);
+
+	clk_disable_unprepare(lvds->clocks.mod);
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_pclk_disable);
+
+/* -----------------------------------------------------------------------------
+ * Bridge
+ */
+
+static enum rcar_lvds_mode rcar_lvds_get_lvds_mode(struct rcar_lvds *lvds,
+					const struct drm_connector *connector)
+{
+	const struct drm_display_info *info;
+	enum rcar_lvds_mode mode;
+
+	/*
+	 * There is no API yet to retrieve LVDS mode from a bridge, only panels
+	 * are supported.
+	 */
+	if (!lvds->panel)
+		return RCAR_LVDS_MODE_JEIDA;
+
+	info = &connector->display_info;
+	if (!info->num_bus_formats || !info->bus_formats) {
+		dev_warn(lvds->dev,
+			 "no LVDS bus format reported, using JEIDA\n");
+		return RCAR_LVDS_MODE_JEIDA;
+	}
+
+	switch (info->bus_formats[0]) {
+	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+		mode = RCAR_LVDS_MODE_JEIDA;
+		break;
+	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+		mode = RCAR_LVDS_MODE_VESA;
+		break;
+	default:
+		dev_warn(lvds->dev,
+			 "unsupported LVDS bus format 0x%04x, using JEIDA\n",
+			 info->bus_formats[0]);
+		return RCAR_LVDS_MODE_JEIDA;
+	}
+
+	if (info->bus_flags & DRM_BUS_FLAG_DATA_LSB_TO_MSB)
+		mode |= RCAR_LVDS_MODE_MIRROR;
+
+	return mode;
+}
+
+static void __rcar_lvds_atomic_enable(struct drm_bridge *bridge,
+				      struct drm_atomic_state *state,
+				      struct drm_crtc *crtc,
+				      struct drm_connector *connector)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+	u32 lvdhcr;
+	u32 lvdcr0;
+	int ret;
+
+	ret = clk_prepare_enable(lvds->clocks.mod);
+	if (ret < 0)
+		return;
+
+	/* Enable the companion LVDS encoder in dual-link mode. */
+	if (lvds->link_type != RCAR_LVDS_SINGLE_LINK && lvds->companion)
+		__rcar_lvds_atomic_enable(lvds->companion, state, crtc,
+					  connector);
+
+	/*
+	 * Hardcode the channels and control signals routing for now.
+	 *
+	 * HSYNC -> CTRL0
+	 * VSYNC -> CTRL1
+	 * DISP  -> CTRL2
+	 * 0     -> CTRL3
+	 */
+	rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO |
+			LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC |
+			LVDCTRCR_CTR0SEL_HSYNC);
+
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_LANES)
+		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3)
+		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1);
+	else
+		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1)
+		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3);
+
+	rcar_lvds_write(lvds, LVDCHCR, lvdhcr);
+
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) {
+		u32 lvdstripe = 0;
+
+		if (lvds->link_type != RCAR_LVDS_SINGLE_LINK) {
+			/*
+			 * By default we generate even pixels from the primary
+			 * encoder and odd pixels from the companion encoder.
+			 * Swap pixels around if the sink requires odd pixels
+			 * from the primary encoder and even pixels from the
+			 * companion encoder.
+			 */
+			bool swap_pixels = lvds->link_type ==
+				RCAR_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
+
+			/*
+			 * Configure vertical stripe since we are dealing with
+			 * an LVDS dual-link connection.
+			 *
+			 * ST_SWAP is reserved for the companion encoder, only
+			 * set it in the primary encoder.
+			 */
+			lvdstripe = LVDSTRIPE_ST_ON
+				  | (lvds->companion && swap_pixels ?
+				     LVDSTRIPE_ST_SWAP : 0);
+		}
+		rcar_lvds_write(lvds, LVDSTRIPE, lvdstripe);
+	}
+
+	/*
+	 * PLL clock configuration on all instances but the companion in
+	 * dual-link mode.
+	 */
+	if (lvds->link_type == RCAR_LVDS_SINGLE_LINK || lvds->companion) {
+		const struct drm_crtc_state *crtc_state =
+			drm_atomic_get_new_crtc_state(state, crtc);
+		const struct drm_display_mode *mode =
+			&crtc_state->adjusted_mode;
+
+		lvds->info->pll_setup(lvds, mode->clock * 1000);
+	}
+
+	/* Set the LVDS mode and select the input. */
+	lvdcr0 = rcar_lvds_get_lvds_mode(lvds, connector) << LVDCR0_LVMD_SHIFT;
+
+	if (lvds->bridge.encoder) {
+		if (drm_crtc_index(crtc) == 2)
+			lvdcr0 |= LVDCR0_DUSEL;
+	}
+
+	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+
+	/* Turn all the channels on. */
+	rcar_lvds_write(lvds, LVDCR1,
+			LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
+			LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);
+
+	if (lvds->info->gen < 3) {
+		/* Enable LVDS operation and turn the bias circuitry on. */
+		lvdcr0 |= LVDCR0_BEN | LVDCR0_LVEN;
+		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+	}
+
+	if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)) {
+		/*
+		 * Turn the PLL on (simple PLL only, extended PLL is fully
+		 * controlled through LVDPLLCR).
+		 */
+		lvdcr0 |= LVDCR0_PLLON;
+		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+	}
+
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_PWD) {
+		/* Set LVDS normal mode. */
+		lvdcr0 |= LVDCR0_PWD;
+		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+	}
+
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN3_LVEN) {
+		/*
+		 * Turn on the LVDS PHY. On D3, the LVEN and LVRES bit must be
+		 * set at the same time, so don't write the register yet.
+		 */
+		lvdcr0 |= LVDCR0_LVEN;
+		if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_PWD))
+			rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+	}
+
+	if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)) {
+		/* Wait for the PLL startup delay (simple PLL only). */
+		usleep_range(100, 150);
+	}
+
+	/* Turn the output on. */
+	lvdcr0 |= LVDCR0_LVRES;
+	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+}
+
+static void rcar_lvds_atomic_enable(struct drm_bridge *bridge,
+				    struct drm_bridge_state *old_bridge_state)
+{
+	struct drm_atomic_state *state = old_bridge_state->base.state;
+	struct drm_connector *connector;
+	struct drm_crtc *crtc;
+
+	connector = drm_atomic_get_new_connector_for_encoder(state,
+							     bridge->encoder);
+	crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
+
+	__rcar_lvds_atomic_enable(bridge, state, crtc, connector);
+}
+
+static void rcar_lvds_atomic_disable(struct drm_bridge *bridge,
+				     struct drm_bridge_state *old_bridge_state)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	rcar_lvds_write(lvds, LVDCR0, 0);
+	rcar_lvds_write(lvds, LVDCR1, 0);
+	rcar_lvds_write(lvds, LVDPLLCR, 0);
+
+	/* Disable the companion LVDS encoder in dual-link mode. */
+	if (lvds->link_type != RCAR_LVDS_SINGLE_LINK && lvds->companion)
+		lvds->companion->funcs->atomic_disable(lvds->companion,
+						       old_bridge_state);
+
+	clk_disable_unprepare(lvds->clocks.mod);
+}
+
+static bool rcar_lvds_mode_fixup(struct drm_bridge *bridge,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+	int min_freq;
+
+	/*
+	 * The internal LVDS encoder has a restricted clock frequency operating
+	 * range, from 5MHz to 148.5MHz on D3 and E3, and from 31MHz to
+	 * 148.5MHz on all other platforms. Clamp the clock accordingly.
+	 */
+	min_freq = lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL ? 5000 : 31000;
+	adjusted_mode->clock = clamp(adjusted_mode->clock, min_freq, 148500);
+
+	return true;
+}
+
+static int rcar_lvds_attach(struct drm_bridge *bridge,
+			    enum drm_bridge_attach_flags flags)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	if (!lvds->next_bridge)
+		return 0;
+
+	return drm_bridge_attach(bridge->encoder, lvds->next_bridge, bridge,
+				 flags);
+}
+
+static const struct drm_bridge_funcs rcar_lvds_bridge_ops = {
+	.attach = rcar_lvds_attach,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_enable = rcar_lvds_atomic_enable,
+	.atomic_disable = rcar_lvds_atomic_disable,
+	.mode_fixup = rcar_lvds_mode_fixup,
+};
+
+bool rcar_lvds_dual_link(struct drm_bridge *bridge)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	return lvds->link_type != RCAR_LVDS_SINGLE_LINK;
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_dual_link);
+
+bool rcar_lvds_is_connected(struct drm_bridge *bridge)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	return lvds->next_bridge != NULL;
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_is_connected);
+
+/* -----------------------------------------------------------------------------
+ * Probe & Remove
+ */
+
+static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds)
+{
+	const struct of_device_id *match;
+	struct device_node *companion;
+	struct device_node *port0, *port1;
+	struct rcar_lvds *companion_lvds;
+	struct device *dev = lvds->dev;
+	int dual_link;
+	int ret = 0;
+
+	/* Locate the companion LVDS encoder for dual-link operation, if any. */
+	companion = of_parse_phandle(dev->of_node, "renesas,companion", 0);
+	if (!companion)
+		return 0;
+
+	/*
+	 * Sanity check: the companion encoder must have the same compatible
+	 * string.
+	 */
+	match = of_match_device(dev->driver->of_match_table, dev);
+	if (!of_device_is_compatible(companion, match->compatible)) {
+		dev_err(dev, "Companion LVDS encoder is invalid\n");
+		ret = -ENXIO;
+		goto done;
+	}
+
+	/*
+	 * We need to work out if the sink is expecting us to function in
+	 * dual-link mode. We do this by looking at the DT port nodes we are
+	 * connected to, if they are marked as expecting even pixels and
+	 * odd pixels than we need to enable vertical stripe output.
+	 */
+	port0 = of_graph_get_port_by_id(dev->of_node, 1);
+	port1 = of_graph_get_port_by_id(companion, 1);
+	dual_link = drm_of_lvds_get_dual_link_pixel_order(port0, port1);
+	of_node_put(port0);
+	of_node_put(port1);
+
+	switch (dual_link) {
+	case DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS:
+		lvds->link_type = RCAR_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
+		break;
+	case DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS:
+		lvds->link_type = RCAR_LVDS_DUAL_LINK_EVEN_ODD_PIXELS;
+		break;
+	default:
+		/*
+		 * Early dual-link bridge specific implementations populate the
+		 * timings field of drm_bridge. If the flag is set, we assume
+		 * that we are expected to generate even pixels from the primary
+		 * encoder, and odd pixels from the companion encoder.
+		 */
+		if (lvds->next_bridge->timings &&
+		    lvds->next_bridge->timings->dual_link)
+			lvds->link_type = RCAR_LVDS_DUAL_LINK_EVEN_ODD_PIXELS;
+		else
+			lvds->link_type = RCAR_LVDS_SINGLE_LINK;
+	}
+
+	if (lvds->link_type == RCAR_LVDS_SINGLE_LINK) {
+		dev_dbg(dev, "Single-link configuration detected\n");
+		goto done;
+	}
+
+	lvds->companion = of_drm_find_bridge(companion);
+	if (!lvds->companion) {
+		ret = -EPROBE_DEFER;
+		goto done;
+	}
+
+	dev_dbg(dev,
+		"Dual-link configuration detected (companion encoder %pOF)\n",
+		companion);
+
+	if (lvds->link_type == RCAR_LVDS_DUAL_LINK_ODD_EVEN_PIXELS)
+		dev_dbg(dev, "Data swapping required\n");
+
+	/*
+	 * FIXME: We should not be messing with the companion encoder private
+	 * data from the primary encoder, we should rather let the companion
+	 * encoder work things out on its own. However, the companion encoder
+	 * doesn't hold a reference to the primary encoder, and
+	 * drm_of_lvds_get_dual_link_pixel_order needs to be given references
+	 * to the output ports of both encoders, therefore leave it like this
+	 * for the time being.
+	 */
+	companion_lvds = bridge_to_rcar_lvds(lvds->companion);
+	companion_lvds->link_type = lvds->link_type;
+
+done:
+	of_node_put(companion);
+
+	return ret;
+}
+
+static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
+{
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(lvds->dev->of_node, 1, 0,
+					  &lvds->panel, &lvds->next_bridge);
+	if (ret)
+		goto done;
+
+	if (lvds->panel) {
+		lvds->next_bridge = devm_drm_panel_bridge_add(lvds->dev,
+							      lvds->panel);
+		if (IS_ERR_OR_NULL(lvds->next_bridge)) {
+			ret = -EINVAL;
+			goto done;
+		}
+	}
+
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK)
+		ret = rcar_lvds_parse_dt_companion(lvds);
+
+done:
+	/*
+	 * On D3/E3 the LVDS encoder provides a clock to the DU, which can be
+	 * used for the DPAD output even when the LVDS output is not connected.
+	 * Don't fail probe in that case as the DU will need the bridge to
+	 * control the clock.
+	 */
+	if (lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)
+		return ret == -ENODEV ? 0 : ret;
+
+	return ret;
+}
+
+static struct clk *rcar_lvds_get_clock(struct rcar_lvds *lvds, const char *name,
+				       bool optional)
+{
+	struct clk *clk;
+
+	clk = devm_clk_get(lvds->dev, name);
+	if (!IS_ERR(clk))
+		return clk;
+
+	if (PTR_ERR(clk) == -ENOENT && optional)
+		return NULL;
+
+	dev_err_probe(lvds->dev, PTR_ERR(clk), "failed to get %s clock\n",
+		      name ? name : "module");
+
+	return clk;
+}
+
+static int rcar_lvds_get_clocks(struct rcar_lvds *lvds)
+{
+	lvds->clocks.mod = rcar_lvds_get_clock(lvds, NULL, false);
+	if (IS_ERR(lvds->clocks.mod))
+		return PTR_ERR(lvds->clocks.mod);
+
+	/*
+	 * LVDS encoders without an extended PLL have no external clock inputs.
+	 */
+	if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL))
+		return 0;
+
+	lvds->clocks.extal = rcar_lvds_get_clock(lvds, "extal", true);
+	if (IS_ERR(lvds->clocks.extal))
+		return PTR_ERR(lvds->clocks.extal);
+
+	lvds->clocks.dotclkin[0] = rcar_lvds_get_clock(lvds, "dclkin.0", true);
+	if (IS_ERR(lvds->clocks.dotclkin[0]))
+		return PTR_ERR(lvds->clocks.dotclkin[0]);
+
+	lvds->clocks.dotclkin[1] = rcar_lvds_get_clock(lvds, "dclkin.1", true);
+	if (IS_ERR(lvds->clocks.dotclkin[1]))
+		return PTR_ERR(lvds->clocks.dotclkin[1]);
+
+	/* At least one input to the PLL must be available. */
+	if (!lvds->clocks.extal && !lvds->clocks.dotclkin[0] &&
+	    !lvds->clocks.dotclkin[1]) {
+		dev_err(lvds->dev,
+			"no input clock (extal, dclkin.0 or dclkin.1)\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct rcar_lvds_device_info rcar_lvds_r8a7790es1_info = {
+	.gen = 2,
+	.quirks = RCAR_LVDS_QUIRK_LANES,
+	.pll_setup = rcar_lvds_pll_setup_gen2,
+};
+
+static const struct soc_device_attribute lvds_quirk_matches[] = {
+	{
+		.soc_id = "r8a7790", .revision = "ES1.*",
+		.data = &rcar_lvds_r8a7790es1_info,
+	},
+	{ /* sentinel */ }
+};
+
+static int rcar_lvds_probe(struct platform_device *pdev)
+{
+	const struct soc_device_attribute *attr;
+	struct rcar_lvds *lvds;
+	int ret;
+
+	lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
+	if (lvds == NULL)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, lvds);
+
+	lvds->dev = &pdev->dev;
+	lvds->info = of_device_get_match_data(&pdev->dev);
+
+	attr = soc_device_match(lvds_quirk_matches);
+	if (attr)
+		lvds->info = attr->data;
+
+	ret = rcar_lvds_parse_dt(lvds);
+	if (ret < 0)
+		return ret;
+
+	lvds->bridge.funcs = &rcar_lvds_bridge_ops;
+	lvds->bridge.of_node = pdev->dev.of_node;
+
+	lvds->mmio = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(lvds->mmio))
+		return PTR_ERR(lvds->mmio);
+
+	ret = rcar_lvds_get_clocks(lvds);
+	if (ret < 0)
+		return ret;
+
+	drm_bridge_add(&lvds->bridge);
+
+	return 0;
+}
+
+static int rcar_lvds_remove(struct platform_device *pdev)
+{
+	struct rcar_lvds *lvds = platform_get_drvdata(pdev);
+
+	drm_bridge_remove(&lvds->bridge);
+
+	return 0;
+}
+
+static const struct rcar_lvds_device_info rcar_lvds_gen2_info = {
+	.gen = 2,
+	.pll_setup = rcar_lvds_pll_setup_gen2,
+};
+
+static const struct rcar_lvds_device_info rcar_lvds_gen3_info = {
+	.gen = 3,
+	.quirks = RCAR_LVDS_QUIRK_PWD,
+	.pll_setup = rcar_lvds_pll_setup_gen3,
+};
+
+static const struct rcar_lvds_device_info rcar_lvds_r8a77970_info = {
+	.gen = 3,
+	.quirks = RCAR_LVDS_QUIRK_PWD | RCAR_LVDS_QUIRK_GEN3_LVEN,
+	.pll_setup = rcar_lvds_pll_setup_gen2,
+};
+
+static const struct rcar_lvds_device_info rcar_lvds_r8a77990_info = {
+	.gen = 3,
+	.quirks = RCAR_LVDS_QUIRK_GEN3_LVEN | RCAR_LVDS_QUIRK_EXT_PLL
+		| RCAR_LVDS_QUIRK_DUAL_LINK,
+	.pll_setup = rcar_lvds_pll_setup_d3_e3,
+};
+
+static const struct rcar_lvds_device_info rcar_lvds_r8a77995_info = {
+	.gen = 3,
+	.quirks = RCAR_LVDS_QUIRK_GEN3_LVEN | RCAR_LVDS_QUIRK_PWD
+		| RCAR_LVDS_QUIRK_EXT_PLL | RCAR_LVDS_QUIRK_DUAL_LINK,
+	.pll_setup = rcar_lvds_pll_setup_d3_e3,
+};
+
+static const struct of_device_id rcar_lvds_of_table[] = {
+	{ .compatible = "renesas,r8a7742-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a7743-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a7744-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a774a1-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a774b1-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a774c0-lvds", .data = &rcar_lvds_r8a77990_info },
+	{ .compatible = "renesas,r8a774e1-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a7790-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a7791-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a7793-lvds", .data = &rcar_lvds_gen2_info },
+	{ .compatible = "renesas,r8a7795-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a7796-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a77961-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a77965-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a77970-lvds", .data = &rcar_lvds_r8a77970_info },
+	{ .compatible = "renesas,r8a77980-lvds", .data = &rcar_lvds_gen3_info },
+	{ .compatible = "renesas,r8a77990-lvds", .data = &rcar_lvds_r8a77990_info },
+	{ .compatible = "renesas,r8a77995-lvds", .data = &rcar_lvds_r8a77995_info },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, rcar_lvds_of_table);
+
+static struct platform_driver rcar_lvds_platform_driver = {
+	.probe		= rcar_lvds_probe,
+	.remove		= rcar_lvds_remove,
+	.driver		= {
+		.name	= "rcar-lvds",
+		.of_match_table = rcar_lvds_of_table,
+	},
+};
+
+module_platform_driver(rcar_lvds_platform_driver);
+
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_DESCRIPTION("Renesas R-Car LVDS Encoder Driver");
+MODULE_LICENSE("GPL");