From patchwork Wed Apr 14 06:03:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sandeep Maheswaram X-Patchwork-Id: 421483 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C6FBC433B4 for ; Wed, 14 Apr 2021 06:04:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 253F7613BB for ; Wed, 14 Apr 2021 06:04:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349178AbhDNGEg (ORCPT ); Wed, 14 Apr 2021 02:04:36 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:13775 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349122AbhDNGEX (ORCPT ); Wed, 14 Apr 2021 02:04:23 -0400 Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 13 Apr 2021 23:04:02 -0700 X-QCInternal: smtphost Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/AES256-SHA; 13 Apr 2021 23:03:59 -0700 X-QCInternal: smtphost Received: from c-sanm-linux.qualcomm.com ([10.206.25.31]) by ironmsg01-blr.qualcomm.com with ESMTP; 14 Apr 2021 11:33:33 +0530 Received: by c-sanm-linux.qualcomm.com (Postfix, from userid 2343233) id 71C2037A5; Wed, 14 Apr 2021 11:33:32 +0530 (IST) From: Sandeep Maheswaram To: Greg Kroah-Hartman , Felipe Balbi , Stephen Boyd , Doug Anderson , Matthias Kaehlcke Cc: linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Manu Gautam , Sandeep Maheswaram Subject: [PATCH v2] usb: dwc3: core: Add shutdown callback for dwc3 Date: Wed, 14 Apr 2021 11:33:29 +0530 Message-Id: <1618380209-20114-1-git-send-email-sanm@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This patch adds a shutdown callback to USB DWC core driver to ensure that it is properly shutdown in reboot/shutdown path. This is required where SMMU address translation is enabled like on SC7180 SoC and few others. If the hardware is still accessing memory after SMMU translation is disabled as part of SMMU shutdown callback in system reboot or shutdown path, then IOVAs(I/O virtual address) which it was using will go on the bus as the physical addresses which might result in unknown crashes (NoC/interconnect errors). Signed-off-by: Sandeep Maheswaram Acked-by: Felipe Balbi --- Changes in v2: - As per Stephen's comment, calling dwc3_remove in dwc3_shutdown. drivers/usb/dwc3/core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 05e2e54c..2022d90 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1658,6 +1658,11 @@ static int dwc3_remove(struct platform_device *pdev) return 0; } +static void dwc3_shutdown(struct platform_device *pdev) +{ + dwc3_remove(pdev); +} + #ifdef CONFIG_PM static int dwc3_core_init_for_resume(struct dwc3 *dwc) { @@ -1975,6 +1980,7 @@ MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match); static struct platform_driver dwc3_driver = { .probe = dwc3_probe, .remove = dwc3_remove, + .shutdown = dwc3_shutdown, .driver = { .name = "dwc3", .of_match_table = of_match_ptr(of_dwc3_match),