From patchwork Mon Aug 26 05:42:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 11113943 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 19F2816B1 for ; Mon, 26 Aug 2019 05:42:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00D232173E for ; Mon, 26 Aug 2019 05:42:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729241AbfHZFmc (ORCPT ); Mon, 26 Aug 2019 01:42:32 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:48159 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725806AbfHZFmc (ORCPT ); Mon, 26 Aug 2019 01:42:32 -0400 Received: from 61-220-137-37.hinet-ip.hinet.net ([61.220.137.37] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1i27lu-0004UN-0A; Mon, 26 Aug 2019 05:42:30 +0000 From: Kai-Heng Feng To: stern@rowland.harvard.edu Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org, Kai-Heng Feng Subject: [PATCH v2 2/2] USB: storage: ums-realtek: Make auto-delink support optionally Date: Mon, 26 Aug 2019 13:42:16 +0800 Message-Id: <20190826054216.31468-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190826054216.31468-1-kai.heng.feng@canonical.com> References: <20190826054216.31468-1-kai.heng.feng@canonical.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Auto-delink requires writing special registers to ums-realtek device. Unconditionally enable auto-delink may break newer devices. So only enable auto-delink by default for the original three IDs, 0x0138, 0x0158 and 0x0159. Realtek is working on a patch to properly support auto-delink for other IDs. BugLink: https://bugs.launchpad.net/bugs/1838886 Signed-off-by: Kai-Heng Feng --- v2: - Use auto_delink_support instead of auto_delink_enable. drivers/usb/storage/realtek_cr.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c index beaffac805af..b304cca7c4fa 100644 --- a/drivers/usb/storage/realtek_cr.c +++ b/drivers/usb/storage/realtek_cr.c @@ -40,6 +40,10 @@ static int auto_delink_en = 1; module_param(auto_delink_en, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(auto_delink_en, "auto delink mode (0=firmware, 1=software [default])"); +static int auto_delink_support = -1; +module_param(auto_delink_support, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(auto_delink_support, "enable auto delink (-1=auto [default], 0=disable, 1=enable)"); + #ifdef CONFIG_REALTEK_AUTOPM static int ss_en = 1; module_param(ss_en, int, S_IRUGO | S_IWUSR); @@ -996,12 +1000,22 @@ static int init_realtek_cr(struct us_data *us) goto INIT_FAIL; } - if (CHECK_FW_VER(chip, 0x5888) || CHECK_FW_VER(chip, 0x5889) || - CHECK_FW_VER(chip, 0x5901)) - SET_AUTO_DELINK(chip); - if (STATUS_LEN(chip) == 16) { - if (SUPPORT_AUTO_DELINK(chip)) + if (auto_delink_support == -1) { + if (CHECK_PID(chip, 0x0138) || CHECK_PID(chip, 0x0158) || + CHECK_PID(chip, 0x0159)) + auto_delink_support = 1; + else + auto_delink_support = 0; + } + + if (auto_delink_support) { + if (CHECK_FW_VER(chip, 0x5888) || CHECK_FW_VER(chip, 0x5889) || + CHECK_FW_VER(chip, 0x5901)) SET_AUTO_DELINK(chip); + if (STATUS_LEN(chip) == 16) { + if (SUPPORT_AUTO_DELINK(chip)) + SET_AUTO_DELINK(chip); + } } #ifdef CONFIG_REALTEK_AUTOPM if (ss_en)