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, 855 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imx/dcss/dcss-scaler.c b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
new file mode 100644
index 000000000..47852b9dd
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
@@ -0,0 +1,855 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ *
+ * Scaling algorithms were contributed by Dzung Hoang <dzung.hoang@nxp.com>
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_SCALER_CTRL			0x00
+#define   SCALER_EN				BIT(0)
+#define   REPEAT_EN				BIT(4)
+#define   SCALE2MEM_EN				BIT(8)
+#define   MEM2OFIFO_EN				BIT(12)
+#define DCSS_SCALER_OFIFO_CTRL			0x04
+#define   OFIFO_LOW_THRES_POS			0
+#define   OFIFO_LOW_THRES_MASK			GENMASK(9, 0)
+#define   OFIFO_HIGH_THRES_POS			16
+#define   OFIFO_HIGH_THRES_MASK			GENMASK(25, 16)
+#define   UNDERRUN_DETECT_CLR			BIT(26)
+#define   LOW_THRES_DETECT_CLR			BIT(27)
+#define   HIGH_THRES_DETECT_CLR			BIT(28)
+#define   UNDERRUN_DETECT_EN			BIT(29)
+#define   LOW_THRES_DETECT_EN			BIT(30)
+#define   HIGH_THRES_DETECT_EN			BIT(31)
+#define DCSS_SCALER_SDATA_CTRL			0x08
+#define   YUV_EN				BIT(0)
+#define   RTRAM_8LINES				BIT(1)
+#define   Y_UV_BYTE_SWAP			BIT(4)
+#define   A2R10G10B10_FORMAT_POS		8
+#define   A2R10G10B10_FORMAT_MASK		GENMASK(11, 8)
+#define DCSS_SCALER_BIT_DEPTH			0x0C
+#define   LUM_BIT_DEPTH_POS			0
+#define   LUM_BIT_DEPTH_MASK			GENMASK(1, 0)
+#define   CHR_BIT_DEPTH_POS			4
+#define   CHR_BIT_DEPTH_MASK			GENMASK(5, 4)
+#define DCSS_SCALER_SRC_FORMAT			0x10
+#define DCSS_SCALER_DST_FORMAT			0x14
+#define   FORMAT_MASK				GENMASK(1, 0)
+#define DCSS_SCALER_SRC_LUM_RES			0x18
+#define DCSS_SCALER_SRC_CHR_RES			0x1C
+#define DCSS_SCALER_DST_LUM_RES			0x20
+#define DCSS_SCALER_DST_CHR_RES			0x24
+#define   WIDTH_POS				0
+#define   WIDTH_MASK				GENMASK(11, 0)
+#define   HEIGHT_POS				16
+#define   HEIGHT_MASK				GENMASK(27, 16)
+#define DCSS_SCALER_V_LUM_START			0x48
+#define   V_START_MASK				GENMASK(15, 0)
+#define DCSS_SCALER_V_LUM_INC			0x4C
+#define   V_INC_MASK				GENMASK(15, 0)
+#define DCSS_SCALER_H_LUM_START			0x50
+#define   H_START_MASK				GENMASK(18, 0)
+#define DCSS_SCALER_H_LUM_INC			0x54
+#define   H_INC_MASK				GENMASK(15, 0)
+#define DCSS_SCALER_V_CHR_START			0x58
+#define DCSS_SCALER_V_CHR_INC			0x5C
+#define DCSS_SCALER_H_CHR_START			0x60
+#define DCSS_SCALER_H_CHR_INC			0x64
+#define DCSS_SCALER_COEF_VLUM			0x80
+#define DCSS_SCALER_COEF_HLUM			0x140
+#define DCSS_SCALER_COEF_VCHR			0x200
+#define DCSS_SCALER_COEF_HCHR			0x300
+
+struct dcss_scaler_ch {
+	void __iomem *base_reg;
+	u32 base_ofs;
+	struct dcss_scaler *scl;
+
+	u32 sdata_ctrl;
+	u32 scaler_ctrl;
+
+	bool scaler_ctrl_chgd;
+
+	u32 c_vstart;
+	u32 c_hstart;
+
+	bool use_nn_interpolation;
+};
+
+struct dcss_scaler {
+	struct device *dev;
+
+	struct dcss_ctxld *ctxld;
+	u32 ctx_id;
+
+	struct dcss_scaler_ch ch[3];
+};
+
+/* scaler coefficients generator */
+#define PSC_FRAC_BITS 30
+#define PSC_FRAC_SCALE BIT(PSC_FRAC_BITS)
+#define PSC_BITS_FOR_PHASE 4
+#define PSC_NUM_PHASES 16
+#define PSC_STORED_PHASES (PSC_NUM_PHASES / 2 + 1)
+#define PSC_NUM_TAPS 7
+#define PSC_NUM_TAPS_RGBA 5
+#define PSC_COEFF_PRECISION 10
+#define PSC_PHASE_FRACTION_BITS 13
+#define PSC_PHASE_MASK (PSC_NUM_PHASES - 1)
+#define PSC_Q_FRACTION 19
+#define PSC_Q_ROUND_OFFSET (1 << (PSC_Q_FRACTION - 1))
+
+/**
+ * mult_q() - Performs fixed-point multiplication.
+ * @A: multiplier
+ * @B: multiplicand
+ */
+static int mult_q(int A, int B)
+{
+	int result;
+	s64 temp;
+
+	temp = (int64_t)A * (int64_t)B;
+	temp += PSC_Q_ROUND_OFFSET;
+	result = (int)(temp >> PSC_Q_FRACTION);
+	return result;
+}
+
+/**
+ * div_q() - Performs fixed-point division.
+ * @A: dividend
+ * @B: divisor
+ */
+static int div_q(int A, int B)
+{
+	int result;
+	s64 temp;
+
+	temp = (int64_t)A << PSC_Q_FRACTION;
+	if ((temp >= 0 && B >= 0) || (temp < 0 && B < 0))
+		temp += B / 2;
+	else
+		temp -= B / 2;
+
+	result = (int)(temp / B);
+	return result;
+}
+
+/**
+ * exp_approx_q() - Compute approximation to exp(x) function using Taylor
+ *		    series.
+ * @x: fixed-point argument of exp function
+ */
+static int exp_approx_q(int x)
+{
+	int sum = 1 << PSC_Q_FRACTION;
+	int term = 1 << PSC_Q_FRACTION;
+
+	term = mult_q(term, div_q(x, 1 << PSC_Q_FRACTION));
+	sum += term;
+	term = mult_q(term, div_q(x, 2 << PSC_Q_FRACTION));
+	sum += term;
+	term = mult_q(term, div_q(x, 3 << PSC_Q_FRACTION));
+	sum += term;
+	term = mult_q(term, div_q(x, 4 << PSC_Q_FRACTION));
+	sum += term;
+
+	return sum;
+}
+
+/**
+ * dcss_scaler_gaussian_filter() - Generate gaussian prototype filter.
+ * @fc_q: fixed-point cutoff frequency normalized to range [0, 1]
+ * @use_5_taps: indicates whether to use 5 taps or 7 taps
+ * @coef: output filter coefficients
+ */
+static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps,
+					bool phase0_identity,
+					int coef[][PSC_NUM_TAPS])
+{
+	int sigma_q, g0_q, g1_q, g2_q;
+	int tap_cnt1, tap_cnt2, tap_idx, phase_cnt;
+	int mid;
+	int phase;
+	int i;
+	int taps;
+
+	if (use_5_taps)
+		for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
+			coef[phase][0] = 0;
+			coef[phase][PSC_NUM_TAPS - 1] = 0;
+		}
+
+	/* seed coefficient scanner */
+	taps = use_5_taps ? PSC_NUM_TAPS_RGBA : PSC_NUM_TAPS;
+	mid = (PSC_NUM_PHASES * taps) / 2 - 1;
+	phase_cnt = (PSC_NUM_PHASES * (PSC_NUM_TAPS + 1)) / 2;
+	tap_cnt1 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
+	tap_cnt2 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
+
+	/* seed gaussian filter generator */
+	sigma_q = div_q(PSC_Q_ROUND_OFFSET, fc_q);
+	g0_q = 1 << PSC_Q_FRACTION;
+	g1_q = exp_approx_q(div_q(-PSC_Q_ROUND_OFFSET,
+				  mult_q(sigma_q, sigma_q)));
+	g2_q = mult_q(g1_q, g1_q);
+	coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = g0_q;
+
+	for (i = 0; i < mid; i++) {
+		phase_cnt++;
+		tap_cnt1--;
+		tap_cnt2++;
+
+		g0_q = mult_q(g0_q, g1_q);
+		g1_q = mult_q(g1_q, g2_q);
+
+		if ((phase_cnt & PSC_PHASE_MASK) <= 8) {
+			tap_idx = tap_cnt1 >> PSC_BITS_FOR_PHASE;
+			coef[phase_cnt & PSC_PHASE_MASK][tap_idx] = g0_q;
+		}
+		if (((-phase_cnt) & PSC_PHASE_MASK) <= 8) {
+			tap_idx = tap_cnt2 >> PSC_BITS_FOR_PHASE;
+			coef[(-phase_cnt) & PSC_PHASE_MASK][tap_idx] = g0_q;
+		}
+	}
+
+	phase_cnt++;
+	tap_cnt1--;
+	coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = 0;
+
+	/* override phase 0 with identity filter if specified */
+	if (phase0_identity)
+		for (i = 0; i < PSC_NUM_TAPS; i++)
+			coef[0][i] = i == (PSC_NUM_TAPS >> 1) ?
+						(1 << PSC_COEFF_PRECISION) : 0;
+
+	/* normalize coef */
+	for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
+		int sum = 0;
+		s64 ll_temp;
+
+		for (i = 0; i < PSC_NUM_TAPS; i++)
+			sum += coef[phase][i];
+		for (i = 0; i < PSC_NUM_TAPS; i++) {
+			ll_temp = coef[phase][i];
+			ll_temp <<= PSC_COEFF_PRECISION;
+			ll_temp += sum >> 1;
+			ll_temp /= sum;
+			coef[phase][i] = (int)ll_temp;
+		}
+	}
+}
+
+static void dcss_scaler_nearest_neighbor_filter(bool use_5_taps,
+						int coef[][PSC_NUM_TAPS])
+{
+	int i, j;
+
+	for (i = 0; i < PSC_STORED_PHASES; i++)
+		for (j = 0; j < PSC_NUM_TAPS; j++)
+			coef[i][j] = j == PSC_NUM_TAPS >> 1 ?
+						(1 << PSC_COEFF_PRECISION) : 0;
+}
+
+/**
+ * dcss_scaler_filter_design() - Compute filter coefficients using
+ *				 Gaussian filter.
+ * @src_length: length of input
+ * @dst_length: length of output
+ * @use_5_taps: 0 for 7 taps per phase, 1 for 5 taps
+ * @coef: output coefficients
+ */
+static void dcss_scaler_filter_design(int src_length, int dst_length,
+				      bool use_5_taps, bool phase0_identity,
+				      int coef[][PSC_NUM_TAPS],
+				      bool nn_interpolation)
+{
+	int fc_q;
+
+	/* compute cutoff frequency */
+	if (dst_length >= src_length)
+		fc_q = div_q(1, PSC_NUM_PHASES);
+	else
+		fc_q = div_q(dst_length, src_length * PSC_NUM_PHASES);
+
+	if (nn_interpolation)
+		dcss_scaler_nearest_neighbor_filter(use_5_taps, coef);
+	else
+		/* compute gaussian filter coefficients */
+		dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
+}
+
+static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
+{
+	struct dcss_scaler *scl = ch->scl;
+
+	dcss_ctxld_write(scl->ctxld, scl->ctx_id, val, ch->base_ofs + ofs);
+}
+
+static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
+				   unsigned long scaler_base)
+{
+	struct dcss_scaler_ch *ch;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		ch = &scl->ch[i];
+
+		ch->base_ofs = scaler_base + i * 0x400;
+
+		ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
+		if (!ch->base_reg) {
+			dev_err(scl->dev, "scaler: unable to remap ch base\n");
+			return -ENOMEM;
+		}
+
+		ch->scl = scl;
+	}
+
+	return 0;
+}
+
+int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
+{
+	struct dcss_scaler *scaler;
+
+	scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
+	if (!scaler)
+		return -ENOMEM;
+
+	dcss->scaler = scaler;
+	scaler->dev = dcss->dev;
+	scaler->ctxld = dcss->ctxld;
+	scaler->ctx_id = CTX_SB_HP;
+
+	if (dcss_scaler_ch_init_all(scaler, scaler_base)) {
+		int i;
+
+		for (i = 0; i < 3; i++) {
+			if (scaler->ch[i].base_reg)
+				iounmap(scaler->ch[i].base_reg);
+		}
+
+		kfree(scaler);
+
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void dcss_scaler_exit(struct dcss_scaler *scl)
+{
+	int ch_no;
+
+	for (ch_no = 0; ch_no < 3; ch_no++) {
+		struct dcss_scaler_ch *ch = &scl->ch[ch_no];
+
+		dcss_writel(0, ch->base_reg + DCSS_SCALER_CTRL);
+
+		if (ch->base_reg)
+			iounmap(ch->base_reg);
+	}
+
+	kfree(scl);
+}
+
+void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en)
+{
+	struct dcss_scaler_ch *ch = &scl->ch[ch_num];
+	u32 scaler_ctrl;
+
+	scaler_ctrl = en ? SCALER_EN | REPEAT_EN : 0;
+
+	if (en)
+		dcss_scaler_write(ch, ch->sdata_ctrl, DCSS_SCALER_SDATA_CTRL);
+
+	if (ch->scaler_ctrl != scaler_ctrl)
+		ch->scaler_ctrl_chgd = true;
+
+	ch->scaler_ctrl = scaler_ctrl;
+}
+
+static void dcss_scaler_yuv_enable(struct dcss_scaler_ch *ch, bool en)
+{
+	ch->sdata_ctrl &= ~YUV_EN;
+	ch->sdata_ctrl |= en ? YUV_EN : 0;
+}
+
+static void dcss_scaler_rtr_8lines_enable(struct dcss_scaler_ch *ch, bool en)
+{
+	ch->sdata_ctrl &= ~RTRAM_8LINES;
+	ch->sdata_ctrl |= en ? RTRAM_8LINES : 0;
+}
+
+static void dcss_scaler_bit_depth_set(struct dcss_scaler_ch *ch, int depth)
+{
+	u32 val;
+
+	val = depth == 30 ? 2 : 0;
+
+	dcss_scaler_write(ch,
+			  ((val << CHR_BIT_DEPTH_POS) & CHR_BIT_DEPTH_MASK) |
+			  ((val << LUM_BIT_DEPTH_POS) & LUM_BIT_DEPTH_MASK),
+			  DCSS_SCALER_BIT_DEPTH);
+}
+
+enum buffer_format {
+	BUF_FMT_YUV420,
+	BUF_FMT_YUV422,
+	BUF_FMT_ARGB8888_YUV444,
+};
+
+enum chroma_location {
+	PSC_LOC_HORZ_0_VERT_1_OVER_4 = 0,
+	PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4 = 1,
+	PSC_LOC_HORZ_0_VERT_0 = 2,
+	PSC_LOC_HORZ_1_OVER_4_VERT_0 = 3,
+	PSC_LOC_HORZ_0_VERT_1_OVER_2 = 4,
+	PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2 = 5
+};
+
+static void dcss_scaler_format_set(struct dcss_scaler_ch *ch,
+				   enum buffer_format src_fmt,
+				   enum buffer_format dst_fmt)
+{
+	dcss_scaler_write(ch, src_fmt, DCSS_SCALER_SRC_FORMAT);
+	dcss_scaler_write(ch, dst_fmt, DCSS_SCALER_DST_FORMAT);
+}
+
+static void dcss_scaler_res_set(struct dcss_scaler_ch *ch,
+				int src_xres, int src_yres,
+				int dst_xres, int dst_yres,
+				u32 pix_format, enum buffer_format dst_format)
+{
+	u32 lsrc_xres, lsrc_yres, csrc_xres, csrc_yres;
+	u32 ldst_xres, ldst_yres, cdst_xres, cdst_yres;
+	bool src_is_444 = true;
+
+	lsrc_xres = src_xres;
+	csrc_xres = src_xres;
+	lsrc_yres = src_yres;
+	csrc_yres = src_yres;
+	ldst_xres = dst_xres;
+	cdst_xres = dst_xres;
+	ldst_yres = dst_yres;
+	cdst_yres = dst_yres;
+
+	if (pix_format == DRM_FORMAT_UYVY || pix_format == DRM_FORMAT_VYUY ||
+	    pix_format == DRM_FORMAT_YUYV || pix_format == DRM_FORMAT_YVYU) {
+		csrc_xres >>= 1;
+		src_is_444 = false;
+	} else if (pix_format == DRM_FORMAT_NV12 ||
+		   pix_format == DRM_FORMAT_NV21) {
+		csrc_xres >>= 1;
+		csrc_yres >>= 1;
+		src_is_444 = false;
+	}
+
+	if (dst_format == BUF_FMT_YUV422)
+		cdst_xres >>= 1;
+
+	/* for 4:4:4 to 4:2:2 conversion, source height should be 1 less */
+	if (src_is_444 && dst_format == BUF_FMT_YUV422) {
+		lsrc_yres--;
+		csrc_yres--;
+	}
+
+	dcss_scaler_write(ch, (((lsrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+			       (((lsrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+			  DCSS_SCALER_SRC_LUM_RES);
+	dcss_scaler_write(ch, (((csrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+			       (((csrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+			  DCSS_SCALER_SRC_CHR_RES);
+	dcss_scaler_write(ch, (((ldst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+			       (((ldst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+			  DCSS_SCALER_DST_LUM_RES);
+	dcss_scaler_write(ch, (((cdst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+			       (((cdst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+			  DCSS_SCALER_DST_CHR_RES);
+}
+
+#define downscale_fp(factor, fp_pos)		((factor) << (fp_pos))
+#define upscale_fp(factor, fp_pos)		((1 << (fp_pos)) / (factor))
+
+struct dcss_scaler_factors {
+	int downscale;
+	int upscale;
+};
+
+static const struct dcss_scaler_factors dcss_scaler_factors[] = {
+	{3, 8}, {5, 8}, {5, 8},
+};
+
+static void dcss_scaler_fractions_set(struct dcss_scaler_ch *ch,
+				      int src_xres, int src_yres,
+				      int dst_xres, int dst_yres,
+				      u32 src_format, u32 dst_format,
+				      enum chroma_location src_chroma_loc)
+{
+	int src_c_xres, src_c_yres, dst_c_xres, dst_c_yres;
+	u32 l_vinc, l_hinc, c_vinc, c_hinc;
+	u32 c_vstart, c_hstart;
+
+	src_c_xres = src_xres;
+	src_c_yres = src_yres;
+	dst_c_xres = dst_xres;
+	dst_c_yres = dst_yres;
+
+	c_vstart = 0;
+	c_hstart = 0;
+
+	/* adjustments for source chroma location */
+	if (src_format == BUF_FMT_YUV420) {
+		/* vertical input chroma position adjustment */
+		switch (src_chroma_loc) {
+		case PSC_LOC_HORZ_0_VERT_1_OVER_4:
+		case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
+			/*
+			 * move chroma up to first luma line
+			 * (1/4 chroma input line spacing)
+			 */
+			c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
+			break;
+		case PSC_LOC_HORZ_0_VERT_1_OVER_2:
+		case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
+			/*
+			 * move chroma up to first luma line
+			 * (1/2 chroma input line spacing)
+			 */
+			c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 1));
+			break;
+		default:
+			break;
+		}
+		/* horizontal input chroma position adjustment */
+		switch (src_chroma_loc) {
+		case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
+		case PSC_LOC_HORZ_1_OVER_4_VERT_0:
+		case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
+			/* move chroma left 1/4 chroma input sample spacing */
+			c_hstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* adjustments to chroma resolution */
+	if (src_format == BUF_FMT_YUV420) {
+		src_c_xres >>= 1;
+		src_c_yres >>= 1;
+	} else if (src_format == BUF_FMT_YUV422) {
+		src_c_xres >>= 1;
+	}
+
+	if (dst_format == BUF_FMT_YUV422)
+		dst_c_xres >>= 1;
+
+	l_vinc = ((src_yres << 13) + (dst_yres >> 1)) / dst_yres;
+	c_vinc = ((src_c_yres << 13) + (dst_c_yres >> 1)) / dst_c_yres;
+	l_hinc = ((src_xres << 13) + (dst_xres >> 1)) / dst_xres;
+	c_hinc = ((src_c_xres << 13) + (dst_c_xres >> 1)) / dst_c_xres;
+
+	/* save chroma start phase */
+	ch->c_vstart = c_vstart;
+	ch->c_hstart = c_hstart;
+
+	dcss_scaler_write(ch, 0, DCSS_SCALER_V_LUM_START);
+	dcss_scaler_write(ch, l_vinc, DCSS_SCALER_V_LUM_INC);
+
+	dcss_scaler_write(ch, 0, DCSS_SCALER_H_LUM_START);
+	dcss_scaler_write(ch, l_hinc, DCSS_SCALER_H_LUM_INC);
+
+	dcss_scaler_write(ch, c_vstart, DCSS_SCALER_V_CHR_START);
+	dcss_scaler_write(ch, c_vinc, DCSS_SCALER_V_CHR_INC);
+
+	dcss_scaler_write(ch, c_hstart, DCSS_SCALER_H_CHR_START);
+	dcss_scaler_write(ch, c_hinc, DCSS_SCALER_H_CHR_INC);
+}
+
+int dcss_scaler_get_min_max_ratios(struct dcss_scaler *scl, int ch_num,
+				   int *min, int *max)
+{
+	*min = upscale_fp(dcss_scaler_factors[ch_num].upscale, 16);
+	*max = downscale_fp(dcss_scaler_factors[ch_num].downscale, 16);
+
+	return 0;
+}
+
+static void dcss_scaler_program_5_coef_set(struct dcss_scaler_ch *ch,
+					   int base_addr,
+					   int coef[][PSC_NUM_TAPS])
+{
+	int i, phase;
+
+	for (i = 0; i < PSC_STORED_PHASES; i++) {
+		dcss_scaler_write(ch, ((coef[i][1] & 0xfff) << 16 |
+				       (coef[i][2] & 0xfff) << 4  |
+				       (coef[i][3] & 0xf00) >> 8),
+				  base_addr + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[i][3] & 0x0ff) << 20 |
+				       (coef[i][4] & 0xfff) << 8  |
+				       (coef[i][5] & 0xff0) >> 4),
+				  base_addr + 0x40 + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[i][5] & 0x00f) << 24),
+				  base_addr + 0x80 + i * sizeof(u32));
+	}
+
+	/* reverse both phase and tap orderings */
+	for (phase = (PSC_NUM_PHASES >> 1) - 1;
+			i < PSC_NUM_PHASES; i++, phase--) {
+		dcss_scaler_write(ch, ((coef[phase][5] & 0xfff) << 16 |
+				       (coef[phase][4] & 0xfff) << 4  |
+				       (coef[phase][3] & 0xf00) >> 8),
+				  base_addr + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[phase][3] & 0x0ff) << 20 |
+				       (coef[phase][2] & 0xfff) << 8  |
+				       (coef[phase][1] & 0xff0) >> 4),
+				  base_addr + 0x40 + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[phase][1] & 0x00f) << 24),
+				  base_addr + 0x80 + i * sizeof(u32));
+	}
+}
+
+static void dcss_scaler_program_7_coef_set(struct dcss_scaler_ch *ch,
+					   int base_addr,
+					   int coef[][PSC_NUM_TAPS])
+{
+	int i, phase;
+
+	for (i = 0; i < PSC_STORED_PHASES; i++) {
+		dcss_scaler_write(ch, ((coef[i][0] & 0xfff) << 16 |
+				       (coef[i][1] & 0xfff) << 4  |
+				       (coef[i][2] & 0xf00) >> 8),
+				  base_addr + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[i][2] & 0x0ff) << 20 |
+				       (coef[i][3] & 0xfff) << 8  |
+				       (coef[i][4] & 0xff0) >> 4),
+				  base_addr + 0x40 + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[i][4] & 0x00f) << 24 |
+				       (coef[i][5] & 0xfff) << 12 |
+				       (coef[i][6] & 0xfff)),
+				  base_addr + 0x80 + i * sizeof(u32));
+	}
+
+	/* reverse both phase and tap orderings */
+	for (phase = (PSC_NUM_PHASES >> 1) - 1;
+			i < PSC_NUM_PHASES; i++, phase--) {
+		dcss_scaler_write(ch, ((coef[phase][6] & 0xfff) << 16 |
+				       (coef[phase][5] & 0xfff) << 4  |
+				       (coef[phase][4] & 0xf00) >> 8),
+				  base_addr + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[phase][4] & 0x0ff) << 20 |
+				       (coef[phase][3] & 0xfff) << 8  |
+				       (coef[phase][2] & 0xff0) >> 4),
+				  base_addr + 0x40 + i * sizeof(u32));
+		dcss_scaler_write(ch, ((coef[phase][2] & 0x00f) << 24 |
+				       (coef[phase][1] & 0xfff) << 12 |
+				       (coef[phase][0] & 0xfff)),
+				  base_addr + 0x80 + i * sizeof(u32));
+	}
+}
+
+static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch,
+				     enum buffer_format src_format,
+				     enum buffer_format dst_format,
+				     bool use_5_taps,
+				     int src_xres, int src_yres, int dst_xres,
+				     int dst_yres)
+{
+	int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
+	bool program_5_taps = use_5_taps ||
+			      (dst_format == BUF_FMT_YUV422 &&
+			       src_format == BUF_FMT_ARGB8888_YUV444);
+
+	/* horizontal luma */
+	dcss_scaler_filter_design(src_xres, dst_xres, false,
+				  src_xres == dst_xres, coef,
+				  ch->use_nn_interpolation);
+	dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
+
+	/* vertical luma */
+	dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
+				  src_yres == dst_yres, coef,
+				  ch->use_nn_interpolation);
+
+	if (program_5_taps)
+		dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+	else
+		dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+
+	/* adjust chroma resolution */
+	if (src_format != BUF_FMT_ARGB8888_YUV444)
+		src_xres >>= 1;
+	if (src_format == BUF_FMT_YUV420)
+		src_yres >>= 1;
+	if (dst_format != BUF_FMT_ARGB8888_YUV444)
+		dst_xres >>= 1;
+	if (dst_format == BUF_FMT_YUV420) /* should not happen */
+		dst_yres >>= 1;
+
+	/* horizontal chroma */
+	dcss_scaler_filter_design(src_xres, dst_xres, false,
+				  (src_xres == dst_xres) && (ch->c_hstart == 0),
+				  coef, ch->use_nn_interpolation);
+
+	dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HCHR, coef);
+
+	/* vertical chroma */
+	dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
+				  (src_yres == dst_yres) && (ch->c_vstart == 0),
+				  coef, ch->use_nn_interpolation);
+	if (program_5_taps)
+		dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
+	else
+		dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
+}
+
+static void dcss_scaler_rgb_coef_set(struct dcss_scaler_ch *ch,
+				     int src_xres, int src_yres, int dst_xres,
+				     int dst_yres)
+{
+	int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
+
+	/* horizontal RGB */
+	dcss_scaler_filter_design(src_xres, dst_xres, false,
+				  src_xres == dst_xres, coef,
+				  ch->use_nn_interpolation);
+	dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
+
+	/* vertical RGB */
+	dcss_scaler_filter_design(src_yres, dst_yres, false,
+				  src_yres == dst_yres, coef,
+				  ch->use_nn_interpolation);
+	dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+}
+
+static void dcss_scaler_set_rgb10_order(struct dcss_scaler_ch *ch,
+					const struct drm_format_info *format)
+{
+	u32 a2r10g10b10_format;
+
+	if (format->is_yuv)
+		return;
+
+	ch->sdata_ctrl &= ~A2R10G10B10_FORMAT_MASK;
+
+	if (format->depth != 30)
+		return;
+
+	switch (format->format) {
+	case DRM_FORMAT_ARGB2101010:
+	case DRM_FORMAT_XRGB2101010:
+		a2r10g10b10_format = 0;
+		break;
+
+	case DRM_FORMAT_ABGR2101010:
+	case DRM_FORMAT_XBGR2101010:
+		a2r10g10b10_format = 5;
+		break;
+
+	case DRM_FORMAT_RGBA1010102:
+	case DRM_FORMAT_RGBX1010102:
+		a2r10g10b10_format = 6;
+		break;
+
+	case DRM_FORMAT_BGRA1010102:
+	case DRM_FORMAT_BGRX1010102:
+		a2r10g10b10_format = 11;
+		break;
+
+	default:
+		a2r10g10b10_format = 0;
+		break;
+	}
+
+	ch->sdata_ctrl |= a2r10g10b10_format << A2R10G10B10_FORMAT_POS;
+}
+
+void dcss_scaler_set_filter(struct dcss_scaler *scl, int ch_num,
+			    enum drm_scaling_filter scaling_filter)
+{
+	struct dcss_scaler_ch *ch = &scl->ch[ch_num];
+
+	ch->use_nn_interpolation = scaling_filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR;
+}
+
+void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
+		       const struct drm_format_info *format,
+		       int src_xres, int src_yres, int dst_xres, int dst_yres,
+		       u32 vrefresh_hz)
+{
+	struct dcss_scaler_ch *ch = &scl->ch[ch_num];
+	unsigned int pixel_depth = 0;
+	bool rtr_8line_en = false;
+	bool use_5_taps = false;
+	enum buffer_format src_format = BUF_FMT_ARGB8888_YUV444;
+	enum buffer_format dst_format = BUF_FMT_ARGB8888_YUV444;
+	u32 pix_format = format->format;
+
+	if (format->is_yuv) {
+		dcss_scaler_yuv_enable(ch, true);
+
+		if (pix_format == DRM_FORMAT_NV12 ||
+		    pix_format == DRM_FORMAT_NV21) {
+			rtr_8line_en = true;
+			src_format = BUF_FMT_YUV420;
+		} else if (pix_format == DRM_FORMAT_UYVY ||
+			   pix_format == DRM_FORMAT_VYUY ||
+			   pix_format == DRM_FORMAT_YUYV ||
+			   pix_format == DRM_FORMAT_YVYU) {
+			src_format = BUF_FMT_YUV422;
+		}
+
+		use_5_taps = !rtr_8line_en;
+	} else {
+		dcss_scaler_yuv_enable(ch, false);
+
+		pixel_depth = format->depth;
+	}
+
+	dcss_scaler_fractions_set(ch, src_xres, src_yres, dst_xres,
+				  dst_yres, src_format, dst_format,
+				  PSC_LOC_HORZ_0_VERT_1_OVER_4);
+
+	if (format->is_yuv)
+		dcss_scaler_yuv_coef_set(ch, src_format, dst_format,
+					 use_5_taps, src_xres, src_yres,
+					 dst_xres, dst_yres);
+	else
+		dcss_scaler_rgb_coef_set(ch, src_xres, src_yres,
+					 dst_xres, dst_yres);
+
+	dcss_scaler_rtr_8lines_enable(ch, rtr_8line_en);
+	dcss_scaler_bit_depth_set(ch, pixel_depth);
+	dcss_scaler_set_rgb10_order(ch, format);
+	dcss_scaler_format_set(ch, src_format, dst_format);
+	dcss_scaler_res_set(ch, src_xres, src_yres, dst_xres, dst_yres,
+			    pix_format, dst_format);
+}
+
+/* This function will be called from interrupt context. */
+void dcss_scaler_write_sclctrl(struct dcss_scaler *scl)
+{
+	int chnum;
+
+	dcss_ctxld_assert_locked(scl->ctxld);
+
+	for (chnum = 0; chnum < 3; chnum++) {
+		struct dcss_scaler_ch *ch = &scl->ch[chnum];
+
+		if (ch->scaler_ctrl_chgd) {
+			dcss_ctxld_write_irqsafe(scl->ctxld, scl->ctx_id,
+						 ch->scaler_ctrl,
+						 ch->base_ofs +
+						 DCSS_SCALER_CTRL);
+			ch->scaler_ctrl_chgd = false;
+		}
+	}
+}