From patchwork Wed Jul 26 03:08:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hayes Wang X-Patchwork-Id: 707503 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 671D5C001DE for ; Wed, 26 Jul 2023 03:08:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229953AbjGZDIz (ORCPT ); Tue, 25 Jul 2023 23:08:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229487AbjGZDIy (ORCPT ); Tue, 25 Jul 2023 23:08:54 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 14AD92689; Tue, 25 Jul 2023 20:08:50 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 36Q38NE50011093, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36506.realtek.com.tw[172.21.6.27]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 36Q38NE50011093 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Wed, 26 Jul 2023 11:08:23 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36506.realtek.com.tw (172.21.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Wed, 26 Jul 2023 11:08:35 +0800 Received: from fc38.localdomain (172.22.228.98) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Wed, 26 Jul 2023 11:08:34 +0800 From: Hayes Wang To: , CC: , , , , Hayes Wang Subject: [PATCH net-next v2 1/2] r8152: adjust generic_ocp_write function Date: Wed, 26 Jul 2023 11:08:07 +0800 Message-ID: <20230726030808.9093-418-nic_swsd@realtek.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230726030808.9093-417-nic_swsd@realtek.com> References: <20230726030808.9093-417-nic_swsd@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.22.228.98] X-ClientProxiedBy: RTEXH36505.realtek.com.tw (172.21.6.25) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-Antivirus-Interceptor-Info: fallback X-KSE-AntiSpam-Interceptor-Info: fallback Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Reduce the control transfer if all bytes of first or the last DWORD are written. The original method is to split the control transfer into three parts (the first DWORD, middle continuous data, and the last DWORD). However, they could be combined if whole bytes of the first DWORD or last DWORD are written. That is, the first DWORD or the last DWORD could be combined with the middle continuous data, if the byte_en is 0xff. Signed-off-by: Hayes Wang --- drivers/net/usb/r8152.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 0738baa5b82e..f6578a99dbac 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -1314,16 +1314,24 @@ static int generic_ocp_write(struct r8152 *tp, u16 index, u16 byteen, byteen_end = byteen & BYTE_EN_END_MASK; byen = byteen_start | (byteen_start << 4); - ret = set_registers(tp, index, type | byen, 4, data); - if (ret < 0) - goto error1; - index += 4; - data += 4; - size -= 4; + /* Split the first DWORD if the byte_en is not 0xff */ + if (byen != BYTE_EN_DWORD) { + ret = set_registers(tp, index, type | byen, 4, data); + if (ret < 0) + goto error1; - if (size) { + index += 4; + data += 4; size -= 4; + } + + if (size) { + byen = byteen_end | (byteen_end >> 4); + + /* Split the last DWORD if the byte_en is not 0xff */ + if (byen != BYTE_EN_DWORD) + size -= 4; while (size) { if (size > limit) { @@ -1350,10 +1358,9 @@ static int generic_ocp_write(struct r8152 *tp, u16 index, u16 byteen, } } - byen = byteen_end | (byteen_end >> 4); - ret = set_registers(tp, index, type | byen, 4, data); - if (ret < 0) - goto error1; + /* Set the last DWORD */ + if (byen != BYTE_EN_DWORD) + ret = set_registers(tp, index, type | byen, 4, data); } error1: