From patchwork Wed Nov 14 09:17:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felipe Balbi X-Patchwork-Id: 10682249 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 100B31747 for ; Wed, 14 Nov 2018 09:17:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 049002AF77 for ; Wed, 14 Nov 2018 09:17:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ED5CA2AF78; Wed, 14 Nov 2018 09:17:24 +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=-7.9 required=2.0 tests=BAYES_00,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 7670F2AF6F for ; Wed, 14 Nov 2018 09:17:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732234AbeKNTTr (ORCPT ); Wed, 14 Nov 2018 14:19:47 -0500 Received: from mga04.intel.com ([192.55.52.120]:42688 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727154AbeKNTTq (ORCPT ); Wed, 14 Nov 2018 14:19:46 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Nov 2018 01:17:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,231,1539673200"; d="scan'208";a="280965540" Received: from pipin.fi.intel.com (HELO localhost) ([10.237.72.97]) by fmsmga006.fm.intel.com with ESMTP; 14 Nov 2018 01:17:24 -0800 From: Felipe Balbi To: Linux USB Cc: Felipe Balbi Subject: [PATCH v2 4/4] usb: dwc3: gadget: check if dep->frame_number is still valid Date: Wed, 14 Nov 2018 11:17:13 +0200 Message-Id: <20181114091713.15486-4-felipe.balbi@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181114091713.15486-1-felipe.balbi@linux.intel.com> References: <20181114091713.15486-1-felipe.balbi@linux.intel.com> MIME-Version: 1.0 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 Gadget driver may take an unbounded amount of time to queue requests after XferNotReady. This is important for isochronous endpoints which need to be started for a specific (micro-)frame. If we fail to start a transfer for isochronous endpoint, let's try queueing to a future interval and see if that helps. We will stop trying if we fail a start transfer for 5 intervals in the future. Signed-off-by: Felipe Balbi --- changes since v1: - switch to a retry approach instead of capturing timestamps drivers/usb/dwc3/core.h | 1 + drivers/usb/dwc3/gadget.c | 17 ++++++++++++++--- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index ea59f9b4908a..85599ad6648f 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -38,6 +38,7 @@ #define DWC3_EP0_SETUP_SIZE 512 #define DWC3_ENDPOINTS_NUM 32 #define DWC3_XHCI_RESOURCES_NUM 2 +#define DWC3_ISOC_MAX_RETRIES 5 #define DWC3_SCRATCHBUF_SIZE 4096 /* each buffer is assumed to be 4KiB */ #define DWC3_EVENT_BUFFERS_SIZE 4096 diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index d8c7ad0c22e8..1590516735cb 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -27,7 +27,7 @@ #include "gadget.h" #include "io.h" -#define DWC3_ALIGN_FRAME(d) (((d)->frame_number + (d)->interval) \ +#define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \ & ~((d)->interval - 1)) /** @@ -1268,13 +1268,24 @@ static int __dwc3_gadget_get_frame(struct dwc3 *dwc) static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep) { + int retries; + int ret; + int i; + if (list_empty(&dep->pending_list)) { dep->flags |= DWC3_EP_PENDING_REQUEST; return -EAGAIN; } - dep->frame_number = DWC3_ALIGN_FRAME(dep); - return __dwc3_gadget_kick_transfer(dep); + for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) { + dep->frame_number = DWC3_ALIGN_FRAME(dep, i); + + ret = __dwc3_gadget_kick_transfer(dep); + if (ret != -EAGAIN) + break; + } + + return ret; } static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)