From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751411AbdCMILT (ORCPT ); Mon, 13 Mar 2017 04:11:19 -0400 Received: from lelnx194.ext.ti.com ([198.47.27.80]:55672 "EHLO lelnx194.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbdCMILM (ORCPT ); Mon, 13 Mar 2017 04:11:12 -0400 Subject: [PATCH v2] usb: xhci: bInterval quirk for TI TUSB73x0 To: References: <1489049268-30607-1-git-send-email-rogerq@ti.com> <235e20da-ad1c-d417-02e8-962eaf657d1d@cogentembedded.com> <1d4406de-c428-a2b2-55b2-5e68d21aab3a@ti.com> CC: Sergei Shtylyov , , , From: Roger Quadros Message-ID: <9de96f48-1570-974a-2ceb-acf051a80e6b@ti.com> Date: Mon, 13 Mar 2017 10:11:06 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 MIME-Version: 1.0 In-Reply-To: <1d4406de-c428-a2b2-55b2-5e68d21aab3a@ti.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 an 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 --- v2: -fixed typo in commit message 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 ba1853f4..05fb3f6 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1502,6 +1502,17 @@ 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 fc99f51..7b86508 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 da3eb69..2496bd6 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1818,6 +1818,7 @@ 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; -- 2.7.4