diff --git a/scripts/kernel/build-linux-rpi.sh b/scripts/kernel/build-linux-rpi.sh
index 6acaf39..5bd17e1 100644
--- a/scripts/kernel/build-linux-rpi.sh
+++ b/scripts/kernel/build-linux-rpi.sh
@@ -20,6 +20,11 @@ PKGBUILD_REPO=${LESAVKA_KERNEL_PKG_REPO:-https://github.com/archlinuxarm/PKGBUIL
 BUILD_ROOT=${LESAVKA_KERNEL_BUILD_ROOT:-/var/tmp/lesavka-linux-rpi}
 PKGREL=${LESAVKA_KERNEL_PKGREL:-2}
 JOBS=${LESAVKA_KERNEL_JOBS:-2}
+SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+PATCH_DIR=${LESAVKA_KERNEL_PATCH_DIR:-$SCRIPT_DIR}
+PATCH_DWC2_FIFO=${LESAVKA_KERNEL_PATCH_DWC2_FIFO:-}
+PATCH_UVC_BULK=${LESAVKA_KERNEL_PATCH_UVC_BULK:-}
+PATCH_UVC_DEBUG=${LESAVKA_KERNEL_PATCH_UVC_DEBUG:-}
 
 HEARTBEAT=/etc/lesavka/watchdog.touch
 if [[ -w $HEARTBEAT && -z ${LESAVKA_DISABLE_KEEPALIVE:-} ]]; then
@@ -94,10 +99,69 @@ for line in sums:
 pkgbuild.write_text(text)
 PY
 
+MAKEPKG_EXTRA=""
+KERNEL_SRC="$BUILD_ROOT/linux-rpi/src/linux-$KERNEL_COMMIT"
+PATCHES=()
+if [[ -n $PATCH_DWC2_FIFO ]]; then
+  PATCHES+=("dwc2-fifo.patch")
+fi
+if [[ -n $PATCH_UVC_BULK ]]; then
+  PATCHES+=("uvc-bulk.patch")
+fi
+if [[ -n $PATCH_UVC_DEBUG ]]; then
+  PATCHES+=("uvc-debug.patch")
+fi
+if [[ ${#PATCHES[@]} -gt 0 ]]; then
+  sudo -u "$BUILD_USER" bash -c "
+    set -euo pipefail
+    cd '$BUILD_ROOT/linux-rpi'
+    MAKEFLAGS='-j$JOBS' makepkg -o --noconfirm
+  "
+  sudo -u "$BUILD_USER" bash -c "
+    set -euo pipefail
+    src='$KERNEL_SRC'
+    if [[ ! -d \$src ]]; then
+      echo \"missing kernel source \$src\" >&2
+      exit 1
+    fi
+    cd \"\$src\"
+    for patch in ${PATCHES[*]}; do
+      patch_file='$PATCH_DIR/'\"\$patch\"
+      if [[ ! -f \$patch_file ]]; then
+        echo \"missing patch \$patch_file\" >&2
+        exit 1
+      fi
+      case \"\$patch\" in
+        dwc2-fifo.patch)
+          if grep -q 'dwc2_check_param_fifo_total' \"drivers/usb/dwc2/params.c\"; then
+            echo \"dwc2-fifo patch already applied\"
+            continue
+          fi
+          ;;
+        uvc-bulk.patch)
+          if grep -q 'streaming_bulk' \"drivers/usb/gadget/function/uvc_configfs.c\"; then
+            echo \"uvc-bulk patch already applied\"
+            continue
+          fi
+          ;;
+        uvc-debug.patch)
+          if grep -q 'uvcg_video_enable: missing uvc/func/config' \
+            \"drivers/usb/gadget/function/uvc_video.c\"; then
+            echo \"uvc-debug patch already applied\"
+            continue
+          fi
+          ;;
+      esac
+      patch -p1 < \"\$patch_file\"
+    done
+  "
+  MAKEPKG_EXTRA="-e"
+fi
+
 sudo -u "$BUILD_USER" bash -c "
   set -euo pipefail
   cd '$BUILD_ROOT/linux-rpi'
-  MAKEFLAGS='-j$JOBS' makepkg -s --noconfirm
+  MAKEFLAGS='-j$JOBS' makepkg -s --noconfirm $MAKEPKG_EXTRA
 "
 
 mapfile -t PKGS < <(ls "$BUILD_ROOT/linux-rpi"/*.pkg.tar.* 2>/dev/null)
diff --git a/scripts/kernel/dwc2-fifo.patch b/scripts/kernel/dwc2-fifo.patch
new file mode 100644
index 0000000..051f309
--- /dev/null
+++ b/scripts/kernel/dwc2-fifo.patch
@@ -0,0 +1,68 @@
+diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
+index 0a10aa2f8f5c..d7c5a3d1c4de 100644
+--- a/drivers/usb/dwc2/gadget.c
++++ b/drivers/usb/dwc2/gadget.c
+@@ -226,10 +226,7 @@ int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg)
+ {
+ 	int addr;
+ 	int tx_addr_max;
+-	u32 np_tx_fifo_size;
+-
+-	np_tx_fifo_size = min_t(u32, hsotg->hw_params.dev_nperio_tx_fifo_size,
+-				hsotg->params.g_np_tx_fifo_size);
++	u32 np_tx_fifo_size = hsotg->params.g_np_tx_fifo_size;
+ 
+ 	/* Get Endpoint Info Control block size in DWORDs. */
+ 	tx_addr_max = hsotg->hw_params.total_fifo_size;
+diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
+index 5d29c2157fbe..b25f7399b41c 100644
+--- a/drivers/usb/dwc2/params.c
++++ b/drivers/usb/dwc2/params.c
+@@ -767,6 +767,35 @@ static void dwc2_check_param_tx_fifo_sizes(struct dwc2_hsotg *hsotg)
+ 	}
+ }
+ 
++static void dwc2_check_param_fifo_total(struct dwc2_hsotg *hsotg)
++{
++	struct dwc2_core_params *p = &hsotg->params;
++	u32 total_tx = 0;
++	u32 max_np;
++	int fifo_count;
++	int fifo;
++
++	fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
++	for (fifo = 1; fifo <= fifo_count; fifo++)
++		total_tx += p->g_tx_fifo_size[fifo];
++
++	if (p->g_rx_fifo_size + p->g_np_tx_fifo_size + total_tx <=
++	    hsotg->hw_params.total_fifo_size)
++		return;
++
++	max_np = 16;
++	if (hsotg->hw_params.total_fifo_size > p->g_rx_fifo_size + total_tx)
++		max_np = hsotg->hw_params.total_fifo_size -
++			 p->g_rx_fifo_size - total_tx;
++	if (max_np < 16)
++		max_np = 16;
++
++	dev_warn(hsotg->dev,
++		 "%s: FIFO sizes exceed total, clamping g_np_tx_fifo_size to %u\n",
++		 __func__, max_np);
++	p->g_np_tx_fifo_size = max_np;
++}
++
+ static void dwc2_check_param_eusb2_disc(struct dwc2_hsotg *hsotg)
+ {
+ 	u32 gsnpsid;
+@@ -879,9 +879,10 @@ static void dwc2_check_params(struct dwc2_hsotg *hsotg)
+		CHECK_RANGE(g_rx_fifo_size,
+			    16, hw->rx_fifo_size,
+			    hw->rx_fifo_size);
+		CHECK_RANGE(g_np_tx_fifo_size,
+-			    16, hw->dev_nperio_tx_fifo_size,
++			    16, hw->total_fifo_size,
+			    hw->dev_nperio_tx_fifo_size);
+		dwc2_check_param_tx_fifo_sizes(hsotg);
++		dwc2_check_param_fifo_total(hsotg);
+ 	}
+ }
diff --git a/scripts/kernel/uvc-bulk.patch b/scripts/kernel/uvc-bulk.patch
new file mode 100644
index 0000000..46deb43
--- /dev/null
+++ b/scripts/kernel/uvc-bulk.patch
@@ -0,0 +1,173 @@
+diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
+index aa6ab666741a..7fb30b09e980 100644
+--- a/drivers/usb/gadget/function/f_uvc.c
++++ b/drivers/usb/gadget/function/f_uvc.c
+@@ -652,22 +652,32 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
+ 	unsigned int max_packet_size;
+ 	struct usb_ep *ep;
+ 	struct f_uvc_opts *opts;
++	bool bulk;
+ 	int ret = -EINVAL;
+ 
+ 	uvcg_info(f, "%s()\n", __func__);
+ 
+ 	opts = fi_to_f_uvc_opts(f->fi);
++	bulk = opts->streaming_bulk;
+ 	/* Sanity check the streaming endpoint module parameters. */
+ 	opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
+-	opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
+ 	opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
+ 
+-	/* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
+-	if (opts->streaming_maxburst &&
+-	    (opts->streaming_maxpacket % 1024) != 0) {
+-		opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
+-		uvcg_info(f, "overriding streaming_maxpacket to %d\n",
+-			  opts->streaming_maxpacket);
++	if (bulk) {
++		opts->streaming_maxpacket =
++			clamp(opts->streaming_maxpacket, 1U, 1024U);
++	} else {
++		opts->streaming_maxpacket =
++			clamp(opts->streaming_maxpacket, 1U, 3072U);
++		/* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
++		if (opts->streaming_maxburst &&
++		    (opts->streaming_maxpacket % 1024) != 0) {
++			opts->streaming_maxpacket =
++				roundup(opts->streaming_maxpacket, 1024);
++			uvcg_info(f,
++				  "overriding streaming_maxpacket to %d\n",
++				  opts->streaming_maxpacket);
++		}
+ 	}
+ 
+ 	/*
+@@ -677,37 +687,70 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
+ 	 * NOTE: We assume that the user knows what they are doing and won't
+ 	 * give parameters that their UDC doesn't support.
+ 	 */
+-	if (opts->streaming_maxpacket <= 1024) {
++	if (bulk) {
+ 		max_packet_mult = 1;
+ 		max_packet_size = opts->streaming_maxpacket;
+-	} else if (opts->streaming_maxpacket <= 2048) {
+-		max_packet_mult = 2;
+-		max_packet_size = opts->streaming_maxpacket / 2;
+-	} else {
+-		max_packet_mult = 3;
+-		max_packet_size = opts->streaming_maxpacket / 3;
+-	}
+ 
+-	uvc_fs_streaming_ep.wMaxPacketSize =
+-		cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
+-	uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
++		uvc_fs_streaming_ep.bmAttributes = USB_ENDPOINT_XFER_BULK;
++		uvc_hs_streaming_ep.bmAttributes = USB_ENDPOINT_XFER_BULK;
++		uvc_ss_streaming_ep.bmAttributes = USB_ENDPOINT_XFER_BULK;
+ 
+-	uvc_hs_streaming_ep.wMaxPacketSize =
+-		cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
++		uvc_fs_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(min(opts->streaming_maxpacket, 64U));
++		uvc_fs_streaming_ep.bInterval = 0;
+ 
+-	/* A high-bandwidth endpoint must specify a bInterval value of 1 */
+-	if (max_packet_mult > 1)
+-		uvc_hs_streaming_ep.bInterval = 1;
+-	else
+-		uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
+-
+-	uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
+-	uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
+-	uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
+-	uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
+-	uvc_ss_streaming_comp.wBytesPerInterval =
+-		cpu_to_le16(max_packet_size * max_packet_mult *
+-			    (opts->streaming_maxburst + 1));
++		uvc_hs_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(min(opts->streaming_maxpacket, 512U));
++		uvc_hs_streaming_ep.bInterval = 0;
++
++		uvc_ss_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(min(opts->streaming_maxpacket, 1024U));
++		uvc_ss_streaming_ep.bInterval = 0;
++		uvc_ss_streaming_comp.bmAttributes = 0;
++		uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
++		uvc_ss_streaming_comp.wBytesPerInterval = cpu_to_le16(0);
++	} else {
++		if (opts->streaming_maxpacket <= 1024) {
++			max_packet_mult = 1;
++			max_packet_size = opts->streaming_maxpacket;
++		} else if (opts->streaming_maxpacket <= 2048) {
++			max_packet_mult = 2;
++			max_packet_size = opts->streaming_maxpacket / 2;
++		} else {
++			max_packet_mult = 3;
++			max_packet_size = opts->streaming_maxpacket / 3;
++		}
++
++		uvc_fs_streaming_ep.bmAttributes =
++			USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC;
++		uvc_hs_streaming_ep.bmAttributes =
++			USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC;
++		uvc_ss_streaming_ep.bmAttributes =
++			USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC;
++
++		uvc_fs_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
++		uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
++
++		uvc_hs_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(max_packet_size |
++				    ((max_packet_mult - 1) << 11));
++
++		/* A high-bandwidth endpoint must specify a bInterval value of 1 */
++		if (max_packet_mult > 1)
++			uvc_hs_streaming_ep.bInterval = 1;
++		else
++			uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
++
++		uvc_ss_streaming_ep.wMaxPacketSize =
++			cpu_to_le16(max_packet_size);
++		uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
++		uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
++		uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
++		uvc_ss_streaming_comp.wBytesPerInterval =
++			cpu_to_le16(max_packet_size * max_packet_mult *
++				    (opts->streaming_maxburst + 1));
++	}
+ 
+ 	/* Allocate endpoints. */
+ 	if (opts->enable_interrupt_ep) {
+diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h
+index 3ac392cbb779..b57e2d10ddcd 100644
+--- a/drivers/usb/gadget/function/u_uvc.h
++++ b/drivers/usb/gadget/function/u_uvc.h
+@@ -24,6 +24,7 @@ struct f_uvc_opts {
+ 	unsigned int					streaming_interval;
+ 	unsigned int					streaming_maxpacket;
+ 	unsigned int					streaming_maxburst;
++	unsigned int					streaming_bulk;
+ 
+ 	unsigned int					control_interface;
+ 	unsigned int					streaming_interface;
+diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
+index a4a2d3dcb0d6..80817ff1b6fe 100644
+--- a/drivers/usb/gadget/function/uvc_configfs.c
++++ b/drivers/usb/gadget/function/uvc_configfs.c
+@@ -3751,6 +3751,7 @@ UVC_ATTR(f_uvc_opts_, cname, cname)
+ UVCG_OPTS_ATTR(streaming_interval, streaming_interval, 16);
+ UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 3072);
+ UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);
++UVCG_OPTS_ATTR(streaming_bulk, streaming_bulk, 1);
+ 
+ #undef UVCG_OPTS_ATTR
+ 
+@@ -3800,6 +3801,7 @@ static struct configfs_attribute *uvc_attrs[] = {
+ 	&f_uvc_opts_attr_streaming_interval,
+ 	&f_uvc_opts_attr_streaming_maxpacket,
+ 	&f_uvc_opts_attr_streaming_maxburst,
++	&f_uvc_opts_attr_streaming_bulk,
+ 	&f_uvc_opts_string_attr_function_name,
+ 	NULL,
+ };
diff --git a/scripts/kernel/uvc-debug.patch b/scripts/kernel/uvc-debug.patch
new file mode 100644
index 0000000..4fa6ebe
--- /dev/null
+++ b/scripts/kernel/uvc-debug.patch
@@ -0,0 +1,47 @@
+--- a/drivers/usb/gadget/function/uvc_video.c
++++ b/drivers/usb/gadget/function/uvc_video.c
+@@
+ int uvcg_video_enable(struct uvc_video *video)
+ {
+ 	int ret;
+ 
++	if (!video) {
++		pr_err("uvcg_video_enable: missing video\n");
++		return -EINVAL;
++	}
++
++	if (!video->uvc || !video->uvc->func.config ||
++	    !video->uvc->func.config->cdev) {
++		pr_err("uvcg_video_enable: missing uvc/func/config video=%p uvc=%p\n",
++		       video, video->uvc);
++		return -ENODEV;
++	}
++
+ 	if (video->ep == NULL) {
+ 		uvcg_info(&video->uvc->func,
+ 			  "Video enable failed, device is uninitialized.\n");
+ 		return -ENODEV;
+ 	}
++
++	if (!video->kworker || !video->async_wq) {
++		uvcg_err(&video->uvc->func,
++			 "Video enable failed, missing worker(s) kworker=%p async_wq=%p\n",
++			 video->kworker, video->async_wq);
++		return -EINVAL;
++	}
++
++	if (!video->queue.queue.dev) {
++		uvcg_err(&video->uvc->func,
++			 "Video enable failed, missing queue device\n");
++		return -EINVAL;
++	}
++
++	uvcg_info(&video->uvc->func,
++		  "Video enable start: video=%p ep=%p kworker=%p async_wq=%p req_size=%u max_payload=%u requests=%u reqs_per_frame=%u use_sg=%u flags=0x%x\n",
++		  video, video->ep, video->kworker, video->async_wq,
++		  video->req_size, video->max_payload_size,
++		  video->uvc_num_requests, video->reqs_per_frame,
++		  video->queue.use_sg, video->queue.flags);
+ 
+ 	/*
+ 	 * Safe to access request related fields without req_lock because