From patchwork Fri Aug 13 15:07:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 497437 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 B4BBCC19F3B for ; Fri, 13 Aug 2021 15:14:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96A796112E for ; Fri, 13 Aug 2021 15:14:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242700AbhHMPOl (ORCPT ); Fri, 13 Aug 2021 11:14:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:56440 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242014AbhHMPNQ (ORCPT ); Fri, 13 Aug 2021 11:13:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 55D6C610FF; Fri, 13 Aug 2021 15:12:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1628867567; bh=5bM0VwdyJN9ot4hCjJftDeLaiVlC+Sip1objMN7EOk4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N6yBDrTq0l592mjZnyJpJJIE/XIT2DuKeKMDRq6LiOWe7nmSLRUoUAC+WIolz/NUV N79/qQUFTVnocefI+wTedVVo/FIa2Ja/yNBF6K3mlW2TsZkLE7037AF8Es7XwK6DW2 iNh+AKl4rz0YzrhQged7iLvviugDQ1N0b6jjnzJc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Longfang Liu Subject: [PATCH 4.19 08/11] USB:ehci:fix Kunpeng920 ehci hardware problem Date: Fri, 13 Aug 2021 17:07:15 +0200 Message-Id: <20210813150520.340771651@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210813150520.072304554@linuxfoundation.org> References: <20210813150520.072304554@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Longfang Liu commit 26b75952ca0b8b4b3050adb9582c8e2f44d49687 upstream. Kunpeng920's EHCI controller does not have SBRN register. Reading the SBRN register when the controller driver is initialized will get 0. When rebooting the EHCI driver, ehci_shutdown() will be called. if the sbrn flag is 0, ehci_shutdown() will return directly. The sbrn flag being 0 will cause the EHCI interrupt signal to not be turned off after reboot. this interrupt that is not closed will cause an exception to the device sharing the interrupt. Therefore, the EHCI controller of Kunpeng920 needs to skip the read operation of the SBRN register. Acked-by: Alan Stern Signed-off-by: Longfang Liu Link: https://lore.kernel.org/r/1617958081-17999-1-git-send-email-liulongfang@huawei.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-pci.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -298,6 +298,9 @@ static int ehci_pci_setup(struct usb_hcd if (pdev->vendor == PCI_VENDOR_ID_STMICRO && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST) ; /* ConneXT has no sbrn register */ + else if (pdev->vendor == PCI_VENDOR_ID_HUAWEI + && pdev->device == 0xa239) + ; /* HUAWEI Kunpeng920 USB EHCI has no sbrn register */ else pci_read_config_byte(pdev, 0x60, &ehci->sbrn);