From patchwork Wed Jul 6 23:36:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thinh Nguyen X-Patchwork-Id: 12908849 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78B22CCA480 for ; Wed, 6 Jul 2022 23:36:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233962AbiGFXgN (ORCPT ); Wed, 6 Jul 2022 19:36:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234526AbiGFXgM (ORCPT ); Wed, 6 Jul 2022 19:36:12 -0400 Received: from smtprelay-out1.synopsys.com (smtprelay-out1.synopsys.com [149.117.87.133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3993E2CC96; Wed, 6 Jul 2022 16:36:11 -0700 (PDT) Received: from mailhost.synopsys.com (sv1-mailhost2.synopsys.com [10.205.2.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client CN "mailhost.synopsys.com", Issuer "SNPSica2" (verified OK)) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id DF199C06E7; Wed, 6 Jul 2022 23:36:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1657150571; bh=F3Qoy0QuryBNUqCHx2QWqtDm02xUe/FRghqpjnMdxjw=; h=Date:In-Reply-To:References:From:Subject:To:Cc:From; b=flOP24YJugwaCOZ9Uar56iE4yMYr4U4ZIUtEjdfKmKY+/toHUzXlz3e07fTt5/x2i R9sDfEli8pAfDwUvQwBa5cKx6ww/icqA0TJZ3QoxkNTHlD52M6k+n02gC09myu/TSp t8piO0d5CNMeK5ij78/u9ejxFYgbcQDprvQHJsgpa0pWFmIVkbIq447AaHuy+Ev03F S/bISRQ/5CYbWdG77ipCAFQZSSU67XORYLsB6B3oar3MIC8g8E9wNgVQmoOH86+bpW ggqsOdoCLWoGL8HtZq2x9ghH+M8nsib6HcIvrCy5TlWuyzzhCgHFwGUYe77ujr2cPB 2tEbv5LNDi35A== Received: from te-lab16-v2 (nanobot.internal.synopsys.com [10.204.48.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mailhost.synopsys.com (Postfix) with ESMTPSA id 97F43A006F; Wed, 6 Jul 2022 23:36:09 +0000 (UTC) Received: by te-lab16-v2 (sSMTP sendmail emulation); Wed, 06 Jul 2022 16:36:09 -0700 Date: Wed, 06 Jul 2022 16:36:09 -0700 Message-Id: <333ce15207bc7ef15e3df97280bacc7639937da1.1657149962.git.Thinh.Nguyen@synopsys.com> In-Reply-To: References: X-SNPS-Relay: synopsys.com From: Thinh Nguyen Subject: [PATCH 17/36] usb: gadget: f_tcm: Increase bMaxBurst To: Felipe Balbi , Greg Kroah-Hartman , Thinh Nguyen , linux-usb@vger.kernel.org, Dmitry Bogdanov , Mike Christie , "Martin K. Petersen" , Roman Bolshakov Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Currently the default bMaxBurst is 0. Set default bMaxBurst to 15 (i.e. 16 bursts) to Data IN and OUT endpoints to improve performance. It should be fine for a controller that supports less than 16 bursts. It should be able to negotiate properly with the host at packet level for the end of burst. If the controller can't handle a burst of 16, and high performance isn't important, the user can use BOT protocol from mass_storage gadget driver instead. Signed-off-by: Thinh Nguyen --- drivers/usb/gadget/function/f_tcm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c index 8e17ac831be0..270ec631481d 100644 --- a/drivers/usb/gadget/function/f_tcm.c +++ b/drivers/usb/gadget/function/f_tcm.c @@ -1774,7 +1774,7 @@ static struct usb_endpoint_descriptor uasp_ss_bi_desc = { static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { .bLength = sizeof(uasp_bi_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, - .bMaxBurst = 0, + .bMaxBurst = 15, .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, .wBytesPerInterval = 0, }; @@ -1782,7 +1782,7 @@ static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { .bLength = sizeof(bot_bi_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, - .bMaxBurst = 0, + .bMaxBurst = 15, }; static struct usb_endpoint_descriptor uasp_bo_desc = { @@ -1817,12 +1817,14 @@ static struct usb_endpoint_descriptor uasp_ss_bo_desc = { static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { .bLength = sizeof(uasp_bo_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bMaxBurst = 15, .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, }; static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { .bLength = sizeof(bot_bo_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bMaxBurst = 15, }; static struct usb_endpoint_descriptor uasp_status_desc = {