2021-08-21 08:54:34 +00:00
|
|
|
From be6ae78e28ff92b6da6af988f3013420af957481 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 | 10 ++++++++++
|
|
|
|
|
drivers/usb/host/xhci.h | 1 +
|
|
|
|
|
3 files changed, 12 insertions(+)
|
|
|
|
|
|
|
|
|
|
--- a/drivers/usb/host/xhci-pci.c
|
|
|
|
|
+++ b/drivers/usb/host/xhci-pci.c
|
2022-01-05 13:27:56 +00:00
|
|
|
@@ -291,6 +291,7 @@ static void xhci_pci_quirks(struct devic
|
2021-08-21 08:54:34 +00:00
|
|
|
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
|
2021-12-08 11:14:30 +00:00
|
|
|
@@ -666,6 +666,16 @@ void xhci_find_new_dequeue_state(struct
|
2021-08-21 08:54:34 +00:00
|
|
|
|
|
|
|
|
} while (!cycle_found || !td_last_trb_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))
|
|
|
|
|
+ state->new_cycle_state ^= 0x1;
|
|
|
|
|
+ next_trb(xhci, ep_ring, &new_seg, &new_deq);
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
state->new_deq_seg = new_seg;
|
|
|
|
|
state->new_deq_ptr = new_deq;
|
|
|
|
|
|
|
|
|
|
--- a/drivers/usb/host/xhci.h
|
|
|
|
|
+++ b/drivers/usb/host/xhci.h
|
2021-09-12 08:54:32 +00:00
|
|
|
@@ -1885,6 +1885,7 @@ struct xhci_hcd {
|
2021-08-21 08:54:34 +00:00
|
|
|
#define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39)
|
|
|
|
|
#define XHCI_NO_SOFT_RETRY BIT_ULL(40)
|
2021-10-27 10:10:45 +00:00
|
|
|
#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42)
|
|
|
|
|
+#define XHCI_AVOID_DQ_ON_LINK BIT_ULL(43)
|
2021-08-21 08:54:34 +00:00
|
|
|
|
|
|
|
|
unsigned int num_active_eps;
|
|
|
|
|
unsigned int limit_active_eps;
|
