From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,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 1AA8EC2BCA1 for ; Fri, 7 Jun 2019 15:56:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7E362133D for ; Fri, 7 Jun 2019 15:56:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559922961; bh=obaZKxvXgYEdqf/Y6HZ6mDMmMasYi5YEMaOeTMivmS8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ivKGeNi3zouT6AI0IWoGVYWzLQQQEEOHl/UcMESaI0XtH65zr3oNbbHUZ5f/4/qr2 WIJr2WO1JWc3aVnZVp+dHapW08kQa0o7civTYkZT5l7Tj/+rGgWK5wBt6ZGgY0E0Rw m2youSAp1h3R0hldsieUSxaSC+kzZeXCJ0D0s020= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731989AbfFGP4A (ORCPT ); Fri, 7 Jun 2019 11:56:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:56616 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730474AbfFGPo7 (ORCPT ); Fri, 7 Jun 2019 11:44:59 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 403B521479; Fri, 7 Jun 2019 15:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559922298; bh=obaZKxvXgYEdqf/Y6HZ6mDMmMasYi5YEMaOeTMivmS8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ik2scNxWMnKgOxiF2FHLj5wkgud410er3s7vDyJmGjgz8RqD7wPnb3gsFyo5x/eYc Ox3qfFJNT6I7UQYOmMzXLQ1NG/nqvXhJc3tuVBLBVOzmgO3FZS4RTORKPUTDeJp5u3 bktYYWb+GjkiUEYZscnaFSlbDA83RpUMorV+PYWQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrey Smirnov , Raul E Rangel , Mathias Nyman Subject: [PATCH 4.19 05/73] xhci: Convert xhci_handshake() to use readl_poll_timeout_atomic() Date: Fri, 7 Jun 2019 17:38:52 +0200 Message-Id: <20190607153849.325088948@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190607153848.669070800@linuxfoundation.org> References: <20190607153848.669070800@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrey Smirnov commit f7fac17ca925faa03fc5eb854c081a24075f8bad upstream. Xhci_handshake() implements the algorithm already captured by readl_poll_timeout_atomic(). Convert the former to use the latter to avoid repetition. Turned out this patch also fixes a bug on the AMD Stoneyridge platform where usleep(1) sometimes takes over 10ms. This means a 5 second timeout can easily take over 15 seconds which will trigger the watchdog and reboot the system. [Add info about patch fixing a bug to commit message -Mathias] Signed-off-by: Andrey Smirnov Tested-by: Raul E Rangel Reviewed-by: Raul E Rangel Cc: Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -52,7 +53,6 @@ static bool td_on_ring(struct xhci_td *t return false; } -/* TODO: copied from ehci-hcd.c - can this be refactored? */ /* * xhci_handshake - spin reading hc until handshake completes or fails * @ptr: address of hc register to be read @@ -69,18 +69,16 @@ static bool td_on_ring(struct xhci_td *t int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec) { u32 result; + int ret; - do { - result = readl(ptr); - if (result == ~(u32)0) /* card removed */ - return -ENODEV; - result &= mask; - if (result == done) - return 0; - udelay(1); - usec--; - } while (usec > 0); - return -ETIMEDOUT; + ret = readl_poll_timeout_atomic(ptr, result, + (result & mask) == done || + result == U32_MAX, + 1, usec); + if (result == U32_MAX) /* card removed */ + return -ENODEV; + + return ret; } /*