bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0717-usb-xhci-add-a-quirk-for-Superspeed-bulk-OUT-transfe.patch b/target/linux/bcm27xx/patches-5.15/950-0717-usb-xhci-add-a-quirk-for-Superspeed-bulk-OUT-transfe.patch
new file mode 100644
index 0000000000..b3bfaef7fb
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0717-usb-xhci-add-a-quirk-for-Superspeed-bulk-OUT-transfe.patch
@@ -0,0 +1,96 @@
+From 12d1b2ed20e6e431ed22b359bc6e13f51f45c2f3 Mon Sep 17 00:00:00 2001
+From: Jonathan Bell <jonathan@raspberrypi.com>
+Date: Wed, 16 Feb 2022 14:31:02 +0000
+Subject: [PATCH] usb: xhci: add a quirk for Superspeed bulk OUT
+ transfers on VL805
+
+The VL805 has a bug in its internal FIFO space accounting that results
+in bulk OUT babble if a TRB in a large multi-element TD has a data
+buffer size that is larger than and not a multiple of wMaxPacketSize for
+the endpoint. If the downstream USB3.0 link is congested, or latency is
+increased through an intermediate hub, then the VL805 enters a suspected
+FIFO overflow condition and transmits repeated, garbled data to the
+endpoint.
+
+TDs with TRBs of exact multiples of wMaxPacketSize and smaller than
+wMaxPacketSize appear to be handled correctly, so split buffers at a
+1024-byte length boundary and put the remainder in a separate smaller
+TRB.
+
+Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
+---
+ drivers/usb/host/xhci-pci.c  |  1 +
+ drivers/usb/host/xhci-ring.c | 21 +++++++++++++++++++--
+ drivers/usb/host/xhci.h      |  1 +
+ 3 files changed, 21 insertions(+), 2 deletions(-)
+
+--- a/drivers/usb/host/xhci-pci.c
++++ b/drivers/usb/host/xhci-pci.c
+@@ -300,6 +300,7 @@ static void xhci_pci_quirks(struct devic
+ 		xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS;
+ 		xhci->quirks |= XHCI_AVOID_DQ_ON_LINK;
+ 		xhci->quirks |= XHCI_VLI_TRB_CACHE_BUG;
++		xhci->quirks |= XHCI_VLI_SS_BULK_OUT_BUG;
+ 	}
+ 
+ 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
+--- a/drivers/usb/host/xhci-ring.c
++++ b/drivers/usb/host/xhci-ring.c
+@@ -3608,14 +3608,15 @@ int xhci_queue_bulk_tx(struct xhci_hcd *
+ 	unsigned int num_trbs;
+ 	unsigned int start_cycle, num_sgs = 0;
+ 	unsigned int enqd_len, block_len, trb_buff_len, full_len;
+-	int sent_len, ret;
+-	u32 field, length_field, remainder;
++	int sent_len, ret, vli_quirk = 0;
++	u32 field, length_field, remainder, maxpacket;
+ 	u64 addr, send_addr;
+ 
+ 	ring = xhci_urb_to_transfer_ring(xhci, urb);
+ 	if (!ring)
+ 		return -EINVAL;
+ 
++	maxpacket = usb_endpoint_maxp(&urb->ep->desc);
+ 	full_len = urb->transfer_buffer_length;
+ 	/* If we have scatter/gather list, we use it. */
+ 	if (urb->num_sgs && !(urb->transfer_flags & URB_DMA_MAP_SINGLE)) {
+@@ -3652,6 +3653,17 @@ int xhci_queue_bulk_tx(struct xhci_hcd *
+ 	start_cycle = ring->cycle_state;
+ 	send_addr = addr;
+ 
++	if (xhci->quirks & XHCI_VLI_SS_BULK_OUT_BUG &&
++	    !usb_urb_dir_in(urb) && urb->dev->speed >= USB_SPEED_SUPER) {
++		/*
++		 * VL805 - superspeed bulk OUT traffic can cause
++		 * an internal fifo overflow if the TRB buffer is larger
++		 * than wMaxPacket and the length is not an integer
++		 * multiple of wMaxPacket.
++		 */
++		vli_quirk = 1;
++	}
++
+ 	/* Queue the TRBs, even if they are zero-length */
+ 	for (enqd_len = 0; first_trb || enqd_len < full_len;
+ 			enqd_len += trb_buff_len) {
+@@ -3664,6 +3676,11 @@ int xhci_queue_bulk_tx(struct xhci_hcd *
+ 		if (enqd_len + trb_buff_len > full_len)
+ 			trb_buff_len = full_len - enqd_len;
+ 
++		if (vli_quirk && trb_buff_len > maxpacket) {
++			/* SS bulk wMaxPacket is 1024B */
++			remainder = trb_buff_len & (maxpacket - 1);
++			trb_buff_len -= remainder;
++		}
+ 		/* Don't change the cycle bit of the first TRB until later */
+ 		if (first_trb) {
+ 			first_trb = false;
+--- a/drivers/usb/host/xhci.h
++++ b/drivers/usb/host/xhci.h
+@@ -1906,6 +1906,7 @@ struct xhci_hcd {
+ #define XHCI_EP_CTX_BROKEN_DCS	BIT_ULL(42)
+ #define XHCI_AVOID_DQ_ON_LINK	BIT_ULL(43)
+ #define XHCI_VLI_TRB_CACHE_BUG	BIT_ULL(44)
++#define XHCI_VLI_SS_BULK_OUT_BUG	BIT_ULL(45)
+ 
+ 	unsigned int		num_active_eps;
+ 	unsigned int		limit_active_eps;