From patchwork Wed May 8 12:28:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Lin X-Patchwork-Id: 10935597 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5AE27924 for ; Wed, 8 May 2019 12:28:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 43A2D289B0 for ; Wed, 8 May 2019 12:28:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 37BAB289C0; Wed, 8 May 2019 12:28:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A92E9289B0 for ; Wed, 8 May 2019 12:28:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728083AbfEHM25 (ORCPT ); Wed, 8 May 2019 08:28:57 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:19078 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727750AbfEHM25 (ORCPT ); Wed, 8 May 2019 08:28:57 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 08 May 2019 05:28:51 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 08 May 2019 05:28:55 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 08 May 2019 05:28:55 -0700 Received: from HQMAIL108.nvidia.com (172.18.146.13) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 8 May 2019 12:28:54 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 8 May 2019 12:28:54 +0000 Received: from jilin-desktop.nvidia.com (Not Verified[10.19.120.147]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 08 May 2019 05:28:54 -0700 From: Jim Lin To: , , , , , , , , CC: , , Jim Lin Subject: [PATCH v5 1/1] usb: xhci: Add Clear_TT_Buffer Date: Wed, 8 May 2019 20:28:49 +0800 Message-ID: <1557318529-7081-1-git-send-email-jilin@nvidia.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1557318531; bh=cRmvK/tiTBL9p7PfWTIm69LLVYs81XAUbkfC2etvNNA=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type; b=qtuU64U18ALZDb6EPsTx9aVBZte2t1f3xoZFNf1yTtg/oqMzbYf9IdVQyOrV3XSlO 9IrS3MQRiSBAQBLu5S3XbaPgCIZcNq9P3V1hGEWUM5N9gkv9Gc7tufhHfN/+67d/IT w0GCjsAzfMdxgGKVAs+woUMULeZNeDnc3FTHnwzapubmPAcGwlUyhD+Idbz+b/zj3Q Sp2yoi2sq+YfP6AHjjcC1Gl9VYky6l6d5EfT90/iuTwkVCshg1u02vNlV2co4kw0JU 2hvnOqJ4t/tvqmoTXzwDuwIrARqqAgOygfAdDFYd2mJPZgnzjzYsGsp54mvoboshWs 7duCw24Bpgd/g== Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP USB 2.0 specification chapter 11.17.5 says "as part of endpoint halt processing for full-/low-speed endpoints connected via a TT, the host software must use the Clear_TT_Buffer request to the TT to ensure that the buffer is not in the busy state". In our case, a full-speed speaker (ConferenceCam) is behind a high- speed hub (ConferenceCam Connect), sometimes once we get STALL on a request we may continue to get STALL with the folllowing requests, like Set_Interface. Solution is for XHCI driver to invoke usb_hub_clear_tt_buffer() to send Clear_TT_Buffer request to the hub of the device for the following Set_Interface requests to the device to get ACK successfully. The Clear_TT_Buffer request sent to the hub includes the address of the LS/FS child device in wValue field. usb_hub_clear_tt_buffer() uses udev->devnum to set the address wValue. This won't work for devices connected to xHC. For other host controllers udev->devnum is the same as the address of the usb device, chosen and set by usb core. With xHC the controller hardware assigns the address, and won't be the same as devnum. In the fix we get that address from slot context if it's XHC. Signed-off-by: Jim Lin --- v2: xhci_clear_tt_buffer_complete: add static, shorter indentation , remove its claiming in xhci.h v3: Add description for clearing_tt (xhci.h) v4: Remove clearing_tt flag because hub_tt_work has hub->tt.lock to protect for Clear_TT_Buffer to be run serially. Remove xhci_clear_tt_buffer_complete as it's not necessary. Same reason as the above. Extend usb_hub_clear_tt_buffer parameter v5: Not extending usb_hub_clear_tt_buffer parameter Add description. drivers/usb/core/hub.c | 17 ++++++++++++++++- drivers/usb/host/xhci-ring.c | 13 +++++++++++++ 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 15a2934dc29d..00d994908217 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -35,6 +35,7 @@ #include "hub.h" #include "otg_whitelist.h" +#include "../host/xhci.h" #define USB_VENDOR_GENESYS_LOGIC 0x05e3 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 @@ -858,6 +859,10 @@ int usb_hub_clear_tt_buffer(struct urb *urb) struct usb_tt *tt = udev->tt; unsigned long flags; struct usb_tt_clear *clear; + struct xhci_hcd *xhci; + struct xhci_virt_device *dev; + struct xhci_slot_ctx *slot_ctx; + int devnum; /* we've got to cope with an arbitrary number of pending TT clears, * since each TT has "at least two" buffers that can need it (and @@ -873,7 +878,17 @@ int usb_hub_clear_tt_buffer(struct urb *urb) /* info that CLEAR_TT_BUFFER needs */ clear->tt = tt->multi ? udev->ttport : 1; clear->devinfo = usb_pipeendpoint (pipe); - clear->devinfo |= udev->devnum << 4; + /* If slot_id is nonzero, then it's XHCI */ + if (udev->slot_id) { + xhci = hcd_to_xhci(bus_to_hcd(udev->bus)); + dev = xhci->devs[udev->slot_id]; + slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx); + /* Device address is assigned by XHC */ + devnum = (int) le32_to_cpu(slot_ctx->dev_state) & + DEV_ADDR_MASK; + clear->devinfo |= devnum << 4; + } else + clear->devinfo |= udev->devnum << 4; clear->devinfo |= usb_pipecontrol(pipe) ? (USB_ENDPOINT_XFER_CONTROL << 11) : (USB_ENDPOINT_XFER_BULK << 11); diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 9215a28dad40..985f85d23b8d 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1786,6 +1786,18 @@ struct xhci_segment *trb_in_td(struct xhci_hcd *xhci, return NULL; } +static void xhci_clear_hub_tt_buffer(struct xhci_hcd *xhci, + unsigned int slot_id, struct xhci_td *td) +{ + /* + * As part of low/full-speed endpoint-halt processing + * we must clear the TT buffer (USB 2.0 specification 11.17.5). + */ + if (td->urb->dev->tt && !usb_pipeint(td->urb->pipe) && + (td->urb->dev->tt->hub != xhci_to_hcd(xhci)->self.root_hub)) + usb_hub_clear_tt_buffer(td->urb); +} + static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id, struct xhci_td *td, @@ -1804,6 +1816,7 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, if (reset_type == EP_HARD_RESET) { ep->ep_state |= EP_HARD_CLEAR_TOGGLE; xhci_cleanup_stalled_ring(xhci, ep_index, stream_id, td); + xhci_clear_hub_tt_buffer(xhci, slot_id, td); } xhci_ring_cmd_db(xhci); }