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, 60 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0600-xhci-quirks-add-link-TRB-quirk-for-VL805.patch b/target/linux/bcm27xx/patches-5.15/950-0600-xhci-quirks-add-link-TRB-quirk-for-VL805.patch
new file mode 100644
index 0000000000..fc30067f1f
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0600-xhci-quirks-add-link-TRB-quirk-for-VL805.patch
@@ -0,0 +1,60 @@
+From 4dccc6e881f1e8d93c895a4b89e266d79e2746df Mon Sep 17 00:00:00 2001
+From: Jonathan Bell <jonathan@raspberrypi.org>
+Date: Mon, 26 Oct 2020 14:03:35 +0000
+Subject: [PATCH] xhci: quirks: add link TRB quirk for VL805
+
+The VL805 controller can't cope with the TR Dequeue Pointer for an endpoint
+being set to a Link TRB. The hardware-maintained endpoint context ends up
+stuck at the address of the Link TRB, leading to erroneous ring expansion
+events whenever the enqueue pointer wraps to the dequeue position.
+
+If the search for the end of the current TD and ring cycle state lands on
+a Link TRB, move to the next segment.
+
+See: https://github.com/raspberrypi/linux/issues/3919
+
+Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
+---
+ drivers/usb/host/xhci-pci.c  | 1 +
+ drivers/usb/host/xhci-ring.c | 9 +++++++++
+ drivers/usb/host/xhci.h      | 1 +
+ 3 files changed, 11 insertions(+)
+
+--- a/drivers/usb/host/xhci-pci.c
++++ b/drivers/usb/host/xhci-pci.c
+@@ -298,6 +298,7 @@ static void xhci_pci_quirks(struct devic
+ 	if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
+ 		xhci->quirks |= XHCI_LPM_SUPPORT;
+ 		xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS;
++		xhci->quirks |= XHCI_AVOID_DQ_ON_LINK;
+ 	}
+ 
+ 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
+--- a/drivers/usb/host/xhci-ring.c
++++ b/drivers/usb/host/xhci-ring.c
+@@ -667,6 +667,15 @@ static int xhci_move_dequeue_past_td(str
+ 	} while (!cycle_found || !td_last_trb_found);
+ 
+ deq_found:
++	/*
++	 * Quirk: the xHC does not correctly parse link TRBs if the HW Dequeue
++	 * pointer is set to one. Advance to the next TRB (and next segment).
++	 */
++	if (xhci->quirks & XHCI_AVOID_DQ_ON_LINK && trb_is_link(new_deq)) {
++		if (link_trb_toggles_cycle(new_deq))
++			new_cycle ^= 0x1;
++		next_trb(xhci, ep_ring, &new_seg, &new_deq);
++	}
+ 
+ 	/* Don't update the ring cycle state for the producer (us). */
+ 	addr = xhci_trb_virt_to_dma(new_seg, new_deq);
+--- a/drivers/usb/host/xhci.h
++++ b/drivers/usb/host/xhci.h
+@@ -1903,6 +1903,7 @@ struct xhci_hcd {
+ #define XHCI_NO_SOFT_RETRY	BIT_ULL(40)
+ #define XHCI_BROKEN_D3COLD	BIT_ULL(41)
+ #define XHCI_EP_CTX_BROKEN_DCS	BIT_ULL(42)
++#define XHCI_AVOID_DQ_ON_LINK	BIT_ULL(43)
+ 
+ 	unsigned int		num_active_eps;
+ 	unsigned int		limit_active_eps;