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=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 A0489C433E0 for ; Fri, 15 Jan 2021 13:32:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6111C22583 for ; Fri, 15 Jan 2021 13:32:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731418AbhAONcG (ORCPT ); Fri, 15 Jan 2021 08:32:06 -0500 Received: from mga02.intel.com ([134.134.136.20]:4203 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727198AbhAONcF (ORCPT ); Fri, 15 Jan 2021 08:32:05 -0500 IronPort-SDR: O55sX5ETQxJsZPkYlCr7P8nF5NRrMBmJ2vZHSZITNE6gZDdoxx3rY/HAZtDLGtuj9CTgwLgqb2 b/GDwF9ZjzZw== X-IronPort-AV: E=McAfee;i="6000,8403,9864"; a="165632800" X-IronPort-AV: E=Sophos;i="5.79,349,1602572400"; d="scan'208";a="165632800" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jan 2021 05:30:34 -0800 IronPort-SDR: rkuGIN6PyV/OIl9tLX8fMuB71hxEhDyCqOQV8o22rtlXLRozEx++TRMRSr8fDCq7JXduWKXAYK N4h9wUCk8q8g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,349,1602572400"; d="scan'208";a="346200160" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga007.fm.intel.com with ESMTP; 15 Jan 2021 05:30:32 -0800 Subject: Re: [PATCH v2] usb: host: xhci-plat: fix support for XHCI_SKIP_PHY_INIT quirk To: =?UTF-8?Q?Pali_Roh=c3=a1r?= , Peter Chen Cc: Mathias Nyman , Greg Kroah-Hartman , Jun Li , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Yoshihiro Shimoda References: <20201221150903.26630-1-pali@kernel.org> <20201223161847.10811-1-pali@kernel.org> <20201224055836.GB27629@b29397-desktop> <20210113232057.niqamgsqlaw7gojw@pali> From: Mathias Nyman Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210113232057.niqamgsqlaw7gojw@pali> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14.1.2021 1.20, Pali Rohár wrote: > On Thursday 24 December 2020 05:59:05 Peter Chen wrote: >> On 20-12-23 17:18:47, Pali Rohár wrote: >>> Currently init_quirk callbacks for xhci platform drivers are called >>> xhci_plat_setup() function which is called after chip reset completes. >>> It happens in the middle of the usb_add_hcd() function. >>> >>> But XHCI_SKIP_PHY_INIT quirk is checked in the xhci_plat_probe() function >>> prior calling usb_add_hcd() function. Therefore this XHCI_SKIP_PHY_INIT >>> currently does nothing as prior xhci_plat_setup() it is not set. >>> >>> Quirk XHCI_SKIP_PHY_INIT is only setting hcd->skip_phy_initialization value >>> which really needs to be set prior calling usb_add_hcd() as this function >>> at its beginning skips PHY init if this member is set. >>> >>> This patch fixes implementation of the XHCI_SKIP_PHY_INIT quirk by calling >>> init_quirk callbacks (via xhci_priv_init_quirk()) prior checking if >>> XHCI_SKIP_PHY_INIT is set. Also checking if either xhci->quirks or >>> priv->quirks contains this XHCI_SKIP_PHY_INIT quirk. >>> >>> Signed-off-by: Pali Rohár >>> >>> --- >>> Changes in v2: >>> * Check also xhci->quirks as xhci_priv_init_quirk() callbacks are setting xhci->quirks >>> * Tested with "usb: host: xhci: mvebu: make USB 3.0 PHY optional for Armada 3720" patch >>> * Removed Fixes: line >>> --- >>> drivers/usb/host/xhci-plat.c | 16 ++++++++-------- >>> 1 file changed, 8 insertions(+), 8 deletions(-) >>> >>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c >>> index 4d34f6005381..0eab7cb5a767 100644 >>> --- a/drivers/usb/host/xhci-plat.c >>> +++ b/drivers/usb/host/xhci-plat.c >>> @@ -89,13 +89,6 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) >>> /* called during probe() after chip reset completes */ >>> static int xhci_plat_setup(struct usb_hcd *hcd) >>> { >>> - int ret; >>> - >>> - >>> - ret = xhci_priv_init_quirk(hcd); >>> - if (ret) >>> - return ret; >>> - >>> return xhci_gen_setup(hcd, xhci_plat_quirks); >>> } >>> >>> @@ -330,7 +323,14 @@ static int xhci_plat_probe(struct platform_device *pdev) >>> >>> hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node); >>> xhci->shared_hcd->tpl_support = hcd->tpl_support; >>> - if (priv && (priv->quirks & XHCI_SKIP_PHY_INIT)) >>> + >>> + if (priv) { >>> + ret = xhci_priv_init_quirk(hcd); >>> + if (ret) >>> + goto disable_usb_phy; >>> + } >>> + >>> + if ((xhci->quirks & XHCI_SKIP_PHY_INIT) || (priv && (priv->quirks & XHCI_SKIP_PHY_INIT))) >>> hcd->skip_phy_initialization = 1; >> >> I am not sure if others agree with you move the position of >> xhci_priv_init_quirk, Let's see Mathias opinion. > > Hello! Do you have an opinion how to handle this issue? As currently it > is needed for another patch which is fixing issue/regression in xhci-mvebu: > https://lore.kernel.org/linux-usb/20201223162403.10897-1-pali@kernel.org/ > I can see the benefit in this. In the xhci-plat case usb_create_hcd and usb_add_hcd are separate steps, and we could both copy the xhci_plat_priv .quirks and run the .init_qurks before adding the hcd. I guess the current way is inherited from pci case where the earliest place to do this after hcd is created is the hcd->driver->reset callback (which is set to xhci_pci_setup() or xhci_plat_setup()). xhci-rcar.c is using the .init_quirk to load firmware, we need to check with them if this change is ok. (added Yoshihiro Shimoda to cc) Their firmware would be loaded before phy parts are initialized, usb bus registered, or roothub device allocated. Thanks -Mathias