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, 615 insertions, 0 deletions

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
new file mode 100644
index 000000000..4b79d4475
--- /dev/null
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -0,0 +1,615 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Red Hat
+ *
+ * based in parts on udlfb.c:
+ * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
+ * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
+ * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
+ */
+
+#include <linux/bitfield.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "udl_drv.h"
+#include "udl_proto.h"
+
+/*
+ * All DisplayLink bulk operations start with 0xaf (UDL_MSG_BULK), followed by
+ * a specific command code. All operations are written to a command buffer, which
+ * the driver sends to the device.
+ */
+static char *udl_set_register(char *buf, u8 reg, u8 val)
+{
+	*buf++ = UDL_MSG_BULK;
+	*buf++ = UDL_CMD_WRITEREG;
+	*buf++ = reg;
+	*buf++ = val;
+
+	return buf;
+}
+
+static char *udl_vidreg_lock(char *buf)
+{
+	return udl_set_register(buf, UDL_REG_VIDREG, UDL_VIDREG_LOCK);
+}
+
+static char *udl_vidreg_unlock(char *buf)
+{
+	return udl_set_register(buf, UDL_REG_VIDREG, UDL_VIDREG_UNLOCK);
+}
+
+static char *udl_set_blank_mode(char *buf, u8 mode)
+{
+	return udl_set_register(buf, UDL_REG_BLANKMODE, mode);
+}
+
+static char *udl_set_color_depth(char *buf, u8 selection)
+{
+	return udl_set_register(buf, UDL_REG_COLORDEPTH, selection);
+}
+
+static char *udl_set_base16bpp(char *buf, u32 base)
+{
+	/* the base pointer is 24 bits wide, 0x20 is hi byte. */
+	u8 reg20 = FIELD_GET(UDL_BASE_ADDR2_MASK, base);
+	u8 reg21 = FIELD_GET(UDL_BASE_ADDR1_MASK, base);
+	u8 reg22 = FIELD_GET(UDL_BASE_ADDR0_MASK, base);
+
+	buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR2, reg20);
+	buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR1, reg21);
+	buf = udl_set_register(buf, UDL_REG_BASE16BPP_ADDR0, reg22);
+
+	return buf;
+}
+
+/*
+ * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
+ * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
+ */
+static char *udl_set_base8bpp(char *buf, u32 base)
+{
+	/* the base pointer is 24 bits wide, 0x26 is hi byte. */
+	u8 reg26 = FIELD_GET(UDL_BASE_ADDR2_MASK, base);
+	u8 reg27 = FIELD_GET(UDL_BASE_ADDR1_MASK, base);
+	u8 reg28 = FIELD_GET(UDL_BASE_ADDR0_MASK, base);
+
+	buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR2, reg26);
+	buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR1, reg27);
+	buf = udl_set_register(buf, UDL_REG_BASE8BPP_ADDR0, reg28);
+
+	return buf;
+}
+
+static char *udl_set_register_16(char *wrptr, u8 reg, u16 value)
+{
+	wrptr = udl_set_register(wrptr, reg, value >> 8);
+	return udl_set_register(wrptr, reg+1, value);
+}
+
+/*
+ * This is kind of weird because the controller takes some
+ * register values in a different byte order than other registers.
+ */
+static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value)
+{
+	wrptr = udl_set_register(wrptr, reg, value);
+	return udl_set_register(wrptr, reg+1, value >> 8);
+}
+
+/*
+ * LFSR is linear feedback shift register. The reason we have this is
+ * because the display controller needs to minimize the clock depth of
+ * various counters used in the display path. So this code reverses the
+ * provided value into the lfsr16 value by counting backwards to get
+ * the value that needs to be set in the hardware comparator to get the
+ * same actual count. This makes sense once you read above a couple of
+ * times and think about it from a hardware perspective.
+ */
+static u16 udl_lfsr16(u16 actual_count)
+{
+	u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
+
+	while (actual_count--) {
+		lv =	 ((lv << 1) |
+			(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
+			& 0xFFFF;
+	}
+
+	return (u16) lv;
+}
+
+/*
+ * This does LFSR conversion on the value that is to be written.
+ * See LFSR explanation above for more detail.
+ */
+static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
+{
+	return udl_set_register_16(wrptr, reg, udl_lfsr16(value));
+}
+
+/*
+ * Takes a DRM display mode and converts it into the DisplayLink
+ * equivalent register commands.
+ */
+static char *udl_set_display_mode(char *buf, struct drm_display_mode *mode)
+{
+	u16 reg01 = mode->crtc_htotal - mode->crtc_hsync_start;
+	u16 reg03 = reg01 + mode->crtc_hdisplay;
+	u16 reg05 = mode->crtc_vtotal - mode->crtc_vsync_start;
+	u16 reg07 = reg05 + mode->crtc_vdisplay;
+	u16 reg09 = mode->crtc_htotal - 1;
+	u16 reg0b = 1; /* libdlo hardcodes hsync start to 1 */
+	u16 reg0d = mode->crtc_hsync_end - mode->crtc_hsync_start + 1;
+	u16 reg0f = mode->hdisplay;
+	u16 reg11 = mode->crtc_vtotal;
+	u16 reg13 = 0; /* libdlo hardcodes vsync start to 0 */
+	u16 reg15 = mode->crtc_vsync_end - mode->crtc_vsync_start;
+	u16 reg17 = mode->crtc_vdisplay;
+	u16 reg1b = mode->clock / 5;
+
+	buf = udl_set_register_lfsr16(buf, UDL_REG_XDISPLAYSTART, reg01);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_XDISPLAYEND, reg03);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_YDISPLAYSTART, reg05);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_YDISPLAYEND, reg07);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_XENDCOUNT, reg09);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_HSYNCSTART, reg0b);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_HSYNCEND, reg0d);
+	buf = udl_set_register_16(buf, UDL_REG_HPIXELS, reg0f);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_YENDCOUNT, reg11);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_VSYNCSTART, reg13);
+	buf = udl_set_register_lfsr16(buf, UDL_REG_VSYNCEND, reg15);
+	buf = udl_set_register_16(buf, UDL_REG_VPIXELS, reg17);
+	buf = udl_set_register_16be(buf, UDL_REG_PIXELCLOCK5KHZ, reg1b);
+
+	return buf;
+}
+
+static char *udl_dummy_render(char *wrptr)
+{
+	*wrptr++ = UDL_MSG_BULK;
+	*wrptr++ = UDL_CMD_WRITECOPY16;
+	*wrptr++ = 0x00; /* from addr */
+	*wrptr++ = 0x00;
+	*wrptr++ = 0x00;
+	*wrptr++ = 0x01; /* one pixel */
+	*wrptr++ = 0x00; /* to address */
+	*wrptr++ = 0x00;
+	*wrptr++ = 0x00;
+	return wrptr;
+}
+
+static long udl_log_cpp(unsigned int cpp)
+{
+	if (WARN_ON(!is_power_of_2(cpp)))
+		return -EINVAL;
+	return __ffs(cpp);
+}
+
+static int udl_handle_damage(struct drm_framebuffer *fb,
+			     const struct iosys_map *map,
+			     const struct drm_rect *clip)
+{
+	struct drm_device *dev = fb->dev;
+	void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
+	int i, ret;
+	char *cmd;
+	struct urb *urb;
+	int log_bpp;
+
+	ret = udl_log_cpp(fb->format->cpp[0]);
+	if (ret < 0)
+		return ret;
+	log_bpp = ret;
+
+	urb = udl_get_urb(dev);
+	if (!urb)
+		return -ENOMEM;
+	cmd = urb->transfer_buffer;
+
+	for (i = clip->y1; i < clip->y2; i++) {
+		const int line_offset = fb->pitches[0] * i;
+		const int byte_offset = line_offset + (clip->x1 << log_bpp);
+		const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp;
+		const int byte_width = drm_rect_width(clip) << log_bpp;
+		ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
+				       &cmd, byte_offset, dev_byte_offset,
+				       byte_width);
+		if (ret)
+			return ret;
+	}
+
+	if (cmd > (char *)urb->transfer_buffer) {
+		/* Send partial buffer remaining before exiting */
+		int len;
+		if (cmd < (char *)urb->transfer_buffer + urb->transfer_buffer_length)
+			*cmd++ = UDL_MSG_BULK;
+		len = cmd - (char *)urb->transfer_buffer;
+		ret = udl_submit_urb(dev, urb, len);
+	} else {
+		udl_urb_completion(urb);
+	}
+
+	return 0;
+}
+
+/*
+ * Primary plane
+ */
+
+static const uint32_t udl_primary_plane_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+};
+
+static const uint64_t udl_primary_plane_fmtmods[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane,
+						   struct drm_atomic_state *state)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+	int ret, idx;
+
+	if (!fb)
+		return; /* no framebuffer; plane is disabled */
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret)
+		return;
+
+	if (!drm_dev_enter(dev, &idx))
+		goto out_drm_gem_fb_end_cpu_access;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		udl_handle_damage(fb, &shadow_plane_state->data[0], &damage);
+	}
+
+	drm_dev_exit(idx);
+
+out_drm_gem_fb_end_cpu_access:
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+}
+
+static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = drm_plane_helper_atomic_check,
+	.atomic_update = udl_primary_plane_helper_atomic_update,
+};
+
+static const struct drm_plane_funcs udl_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS,
+};
+
+/*
+ * CRTC
+ */
+
+static int udl_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+
+	if (!new_crtc_state->enable)
+		return 0;
+
+	return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
+}
+
+static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	struct drm_display_mode *mode = &crtc_state->mode;
+	struct urb *urb;
+	char *buf;
+	int idx;
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	urb = udl_get_urb(dev);
+	if (!urb)
+		goto out;
+
+	buf = (char *)urb->transfer_buffer;
+	buf = udl_vidreg_lock(buf);
+	buf = udl_set_color_depth(buf, UDL_COLORDEPTH_16BPP);
+	/* set base for 16bpp segment to 0 */
+	buf = udl_set_base16bpp(buf, 0);
+	/* set base for 8bpp segment to end of fb */
+	buf = udl_set_base8bpp(buf, 2 * mode->vdisplay * mode->hdisplay);
+	buf = udl_set_display_mode(buf, mode);
+	buf = udl_set_blank_mode(buf, UDL_BLANKMODE_ON);
+	buf = udl_vidreg_unlock(buf);
+	buf = udl_dummy_render(buf);
+
+	udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
+
+out:
+	drm_dev_exit(idx);
+}
+
+static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+	struct drm_device *dev = crtc->dev;
+	struct urb *urb;
+	char *buf;
+	int idx;
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	urb = udl_get_urb(dev);
+	if (!urb)
+		goto out;
+
+	buf = (char *)urb->transfer_buffer;
+	buf = udl_vidreg_lock(buf);
+	buf = udl_set_blank_mode(buf, UDL_BLANKMODE_POWERDOWN);
+	buf = udl_vidreg_unlock(buf);
+	buf = udl_dummy_render(buf);
+
+	udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
+
+out:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs udl_crtc_helper_funcs = {
+	.atomic_check = udl_crtc_helper_atomic_check,
+	.atomic_enable = udl_crtc_helper_atomic_enable,
+	.atomic_disable = udl_crtc_helper_atomic_disable,
+};
+
+static const struct drm_crtc_funcs udl_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+/*
+ * Encoder
+ */
+
+static const struct drm_encoder_funcs udl_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+/*
+ * Connector
+ */
+
+static int udl_connector_helper_get_modes(struct drm_connector *connector)
+{
+	struct udl_connector *udl_connector = to_udl_connector(connector);
+
+	drm_connector_update_edid_property(connector, udl_connector->edid);
+	if (udl_connector->edid)
+		return drm_add_edid_modes(connector, udl_connector->edid);
+
+	return 0;
+}
+
+static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
+	.get_modes = udl_connector_helper_get_modes,
+};
+
+static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+	struct udl_device *udl = data;
+	struct drm_device *dev = &udl->drm;
+	struct usb_device *udev = udl_to_usb_device(udl);
+	u8 *read_buff;
+	int ret;
+	size_t i;
+
+	read_buff = kmalloc(2, GFP_KERNEL);
+	if (!read_buff)
+		return -ENOMEM;
+
+	for (i = 0; i < len; i++) {
+		int bval = (i + block * EDID_LENGTH) << 8;
+
+		ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+				      0x02, (0x80 | (0x02 << 5)), bval,
+				      0xA1, read_buff, 2, USB_CTRL_GET_TIMEOUT);
+		if (ret < 0) {
+			drm_err(dev, "Read EDID byte %zu failed err %x\n", i, ret);
+			goto err_kfree;
+		} else if (ret < 1) {
+			ret = -EIO;
+			drm_err(dev, "Read EDID byte %zu failed\n", i);
+			goto err_kfree;
+		}
+
+		buf[i] = read_buff[1];
+	}
+
+	kfree(read_buff);
+
+	return 0;
+
+err_kfree:
+	kfree(read_buff);
+	return ret;
+}
+
+static enum drm_connector_status udl_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct drm_device *dev = connector->dev;
+	struct udl_device *udl = to_udl(dev);
+	struct udl_connector *udl_connector = to_udl_connector(connector);
+	enum drm_connector_status status = connector_status_disconnected;
+	int idx;
+
+	/* cleanup previous EDID */
+	kfree(udl_connector->edid);
+	udl_connector->edid = NULL;
+
+	if (!drm_dev_enter(dev, &idx))
+		return connector_status_disconnected;
+
+	udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
+	if (udl_connector->edid)
+		status = connector_status_connected;
+
+	drm_dev_exit(idx);
+
+	return status;
+}
+
+static void udl_connector_destroy(struct drm_connector *connector)
+{
+	struct udl_connector *udl_connector = to_udl_connector(connector);
+
+	drm_connector_cleanup(connector);
+	kfree(udl_connector->edid);
+	kfree(udl_connector);
+}
+
+static const struct drm_connector_funcs udl_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.detect = udl_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = udl_connector_destroy,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *udl_connector_init(struct drm_device *dev)
+{
+	struct udl_connector *udl_connector;
+	struct drm_connector *connector;
+	int ret;
+
+	udl_connector = kzalloc(sizeof(*udl_connector), GFP_KERNEL);
+	if (!udl_connector)
+		return ERR_PTR(-ENOMEM);
+
+	connector = &udl_connector->connector;
+	ret = drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_VGA);
+	if (ret)
+		goto err_kfree;
+
+	drm_connector_helper_add(connector, &udl_connector_helper_funcs);
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD |
+			    DRM_CONNECTOR_POLL_CONNECT |
+			    DRM_CONNECTOR_POLL_DISCONNECT;
+
+	return connector;
+
+err_kfree:
+	kfree(udl_connector);
+	return ERR_PTR(ret);
+}
+
+/*
+ * Modesetting
+ */
+
+static enum drm_mode_status udl_mode_config_mode_valid(struct drm_device *dev,
+						       const struct drm_display_mode *mode)
+{
+	struct udl_device *udl = to_udl(dev);
+
+	if (udl->sku_pixel_limit) {
+		if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
+			return MODE_MEM;
+	}
+
+	return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs udl_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.mode_valid = udl_mode_config_mode_valid,
+	.atomic_check  = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+int udl_modeset_init(struct drm_device *dev)
+{
+	struct udl_device *udl = to_udl(dev);
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret;
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	dev->mode_config.min_width = 640;
+	dev->mode_config.min_height = 480;
+	dev->mode_config.max_width = 2048;
+	dev->mode_config.max_height = 2048;
+	dev->mode_config.preferred_depth = 16;
+	dev->mode_config.funcs = &udl_mode_config_funcs;
+
+	primary_plane = &udl->primary_plane;
+	ret = drm_universal_plane_init(dev, primary_plane, 0,
+				       &udl_primary_plane_funcs,
+				       udl_primary_plane_formats,
+				       ARRAY_SIZE(udl_primary_plane_formats),
+				       udl_primary_plane_fmtmods,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(primary_plane, &udl_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &udl->crtc;
+	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+					&udl_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &udl_crtc_helper_funcs);
+
+	encoder = &udl->encoder;
+	ret = drm_encoder_init(dev, encoder, &udl_encoder_funcs, DRM_MODE_ENCODER_DAC, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = udl_connector_init(dev);
+	if (IS_ERR(connector))
+		return PTR_ERR(connector);
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(dev);
+
+	return 0;
+}