From a561f35aeaa92b6ecf083453fbf2fb30f58e1520 Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Fri, 7 Apr 2017 17:57:12 +0300 Subject: [PATCH] usb: xhci: bInterval quirk for TI TUSB73x0 commit 69307ccb9ad7ccb653e332de68effdeaaab6907d upstream. As per [1] issue #4, "The periodic EP scheduler always tries to schedule the EPs that have large intervals (interval equal to or greater than 128 microframes) into different microframes. So it maintains an internal counter and increments for each large interval EP added. When the counter is greater than 128, the scheduler rejects the new EP. So when the hub re-enumerated 128 times, it triggers this condition." This results in Bandwidth error when devices with periodic endpoints (ISO/INT) having bInterval > 7 are plugged and unplugged several times on a TUSB73x0 XHCI host. Workaround this issue by limiting the bInterval to 7 (i.e. interval to 6) for High-speed or faster periodic endpoints. [1] - http://www.ti.com/lit/er/sllz076/sllz076.pdf Signed-off-by: Roger Quadros Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mem.c | 11 +++++++++++ drivers/usb/host/xhci-pci.c | 3 +++ drivers/usb/host/xhci.h | 1 + 3 files changed, 15 insertions(+) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 8414ed2a02de98..27830b683f7162 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1493,6 +1493,17 @@ int xhci_endpoint_init(struct xhci_hcd *xhci, */ max_esit_payload = xhci_get_max_esit_payload(udev, ep); interval = xhci_get_endpoint_interval(udev, ep); + + /* Periodic endpoint bInterval limit quirk */ + if (usb_endpoint_xfer_int(&ep->desc) || + usb_endpoint_xfer_isoc(&ep->desc)) { + if ((xhci->quirks & XHCI_LIMIT_ENDPOINT_INTERVAL_7) && + udev->speed >= USB_SPEED_HIGH && + interval >= 7) { + interval = 6; + } + } + mult = xhci_get_endpoint_mult(udev, ep); max_packet = usb_endpoint_maxp(&ep->desc); max_burst = xhci_get_endpoint_max_burst(udev, ep); diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 954abfd5014d28..93f566cb968b17 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -199,6 +199,9 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) pdev->device == 0x1042) xhci->quirks |= XHCI_BROKEN_STREAMS; + if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241) + xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7; + if (xhci->quirks & XHCI_RESET_ON_RESUME) xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "QUIRK: Resetting on resume"); diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index ea18bf49c2eb0d..98eb5d50e03db5 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1652,6 +1652,7 @@ struct xhci_hcd { #define XHCI_MISSING_CAS (1 << 24) /* For controller with a broken Port Disable implementation */ #define XHCI_BROKEN_PORT_PED (1 << 25) +#define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26) unsigned int num_active_eps; unsigned int limit_active_eps;