From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=5EYj=43=vger.kernel.org=linux-block-owner@kernel.org>
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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,
	SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 F107CC18E5B
	for <linux-block@archiver.kernel.org>; Tue, 10 Mar 2020 17:25:16 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
	by mail.kernel.org (Postfix) with ESMTP id C8B7E21927
	for <linux-block@archiver.kernel.org>; Tue, 10 Mar 2020 17:25:16 +0000 (UTC)
Authentication-Results: mail.kernel.org;
	dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="WuyfZGd6"
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1726295AbgCJRZQ (ORCPT <rfc822;linux-block@archiver.kernel.org>);
        Tue, 10 Mar 2020 13:25:16 -0400
Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:14586 "EHLO
        hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1726271AbgCJRZQ (ORCPT
        <rfc822;linux-block@vger.kernel.org>);
        Tue, 10 Mar 2020 13:25:16 -0400
Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA)
        id <B5e67cd200000>; Tue, 10 Mar 2020 10:23:44 -0700
Received: from hqmail.nvidia.com ([172.20.161.6])
  by hqpgpgate101.nvidia.com (PGP Universal service);
  Tue, 10 Mar 2020 10:25:14 -0700
X-PGP-Universal: processed;
        by hqpgpgate101.nvidia.com on Tue, 10 Mar 2020 10:25:14 -0700
Received: from [10.2.175.232] (10.124.1.5) by HQMAIL107.nvidia.com
 (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 10 Mar
 2020 17:25:13 +0000
Subject: Re: LKFT: arm x15: mmc1: cache flush error -110
To:     Ulf Hansson <ulf.hansson@linaro.org>
CC:     Jon Hunter <jonathanh@nvidia.com>,
        Bitan Biswas <bbiswas@nvidia.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        Jens Axboe <axboe@kernel.dk>,
        Alexei Starovoitov <ast@kernel.org>,
        linux-block <linux-block@vger.kernel.org>,
        <lkft-triage@lists.linaro.org>,
        open list <linux-kernel@vger.kernel.org>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        John Stultz <john.stultz@linaro.org>,
        Faiz Abbas <faiz_abbas@ti.com>,
        Thierry Reding <treding@nvidia.com>,
        Anders Roxell <anders.roxell@linaro.org>,
        Kishon <kishon@ti.com>
References: <CA+G9fYuqAQfhzF2BzHr7vMHx68bo8-jT+ob_F3eHQ3=oFjgYdg@mail.gmail.com>
 <CAPDyKFrrO4noYqdxWL9Y8Nx75LopbDudKGMotkGbGcAF1oq==w@mail.gmail.com>
 <5e9b5646-bd48-e55b-54ee-1c2c41fc9218@nvidia.com>
 <CAPDyKFqpNo_4OePBR1KnJNO=kR8XEqbcsEd=icSceSdDH+Rk1Q@mail.gmail.com>
 <757853cf-987e-f6b6-9259-b4560a031692@nvidia.com>
 <d12fe142-7e72-ab58-33ab-17817e35096f@nvidia.com>
 <c216f131-6f83-c9c9-9d17-8d44ec06972d@nvidia.com>
 <87ad7586-9569-4276-044a-adb64e84ca15@nvidia.com>
 <a0962e0b-0f1d-9f32-f6e9-92f69f93167f@nvidia.com>
 <57ddddc2-3ee8-d867-bba0-0dd9929ba37d@nvidia.com>
 <CAPDyKFqZSd9E3+16yFsmpee2JsbRJ-DGThxx7NJHu6UE00Xi1Q@mail.gmail.com>
 <26ee7225-9483-4664-c2d7-b5cefeadcd4b@nvidia.com>
 <CAPDyKFqwVQDEnPNi33mc9ycTxpaT1cRLejbR3Ja4c8dha4gFRw@mail.gmail.com>
 <0301bbd5-8d4d-4a77-42c7-8a1391c2d60a@nvidia.com>
 <CAPDyKFp93H0=ttazofW9NMBtL5VnjB4PdkwN0FDCtWR0pMHrPA@mail.gmail.com>
 <f01b5533-124a-d978-a90a-9c9c6235fb65@nvidia.com>
 <CAPDyKFqJjsuHect-azQKO8cCoq5JJQrZ=eShsdLHq97NXgXnuQ@mail.gmail.com>
From:   Sowjanya Komatineni <skomatineni@nvidia.com>
Message-ID: <227d9f08-582e-fd79-e1dc-7695bddd162d@nvidia.com>
Date:   Tue, 10 Mar 2020 10:27:46 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.9.0
MIME-Version: 1.0
In-Reply-To: <CAPDyKFqJjsuHect-azQKO8cCoq5JJQrZ=eShsdLHq97NXgXnuQ@mail.gmail.com>
X-Originating-IP: [10.124.1.5]
X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To
 HQMAIL107.nvidia.com (172.20.187.13)
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Transfer-Encoding: 7bit
Content-Language: en-US
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1;
        t=1583861024; bh=u81zjZkUGBM+2adtEa1nBZaymHCbzrmBFSnlbj7WlR4=;
        h=X-PGP-Universal:Subject:To:CC:References:From:Message-ID:Date:
         User-Agent:MIME-Version:In-Reply-To:X-Originating-IP:
         X-ClientProxiedBy:Content-Type:Content-Transfer-Encoding:
         Content-Language;
        b=WuyfZGd69+yiiObkV6kiAq5Y13ZBDkr6Fd/CfP0IOyohs7XadcGaMpSEPK9+OcFdd
         mbM40Sh4IfKYvbfDayRdQwHe20MEzCZMwzE1dL3ZOB6oIYQKW7bz/Px1SCqmRuZZ04
         3fu5dRy4Ict2DrxUvis8S4i+e8TV8iXCjShSXxNkW/z4BHgsCUKSeRXTSkw8PnMBg0
         qm9/IKMnT8+SVcQerASRUpuRlEPfPYXkO3zdYGjVKlKDo0lfvvEJky5zwwUdUyN5P0
         xK1drhaFbDKXn9wA7vdrBQNqllcFeQS2ndch5TtxQhONrl0xvixgOHtM+eS5pTNuzw
         D+stW+XqcH3ig==
Sender: linux-block-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-block.vger.kernel.org>
X-Mailing-List: linux-block@vger.kernel.org


On 3/10/20 10:09 AM, Ulf Hansson wrote:
> External email: Use caution opening links or attachments
>
>
> [...]
>
>>>>> I would like to get the regression fixed asap, but I also would like
>>>>> to avoid reverting patches, unless really necessary. May I propose the
>>>>> following two options.
>>>>>
>>>>> 1. Find out why polling with ->card_busy() or CMD13, for a CMD6 with
>>>>> an R1 response doesn't work - and then fix that behaviour.
>>>>>
>>>>> 2. Set the mmc->max_busy_timeout to zero for sdhci-tegra, which makes
>>>>> the core to always use R1B for CMD6 (and erase). This also means that
>>>>> when the cmd->busy_timeout becomes longer than 11s, sdhci-tegra must
>>>>> disable the HW busy timeout and just wait "forever".
>>>>>
>>>>> If you decide for 2, you can add the software timeout support on top,
>>>>> but make that can be considered as a next step of an improvement,
>>>>> rather than needed as fix. Note that, I believe there are some support
>>>>> for software timeout already in the sdhci core, maybe you need to
>>>>> tweak it a bit for your case, I don't know.
>>>>>
>>>>> Kind regards
>>>>> Uffe
>>>> Hi Uffe
>>>>
>>>> Will go with 2nd option and will send patches out when ready.
>>> Okay, good.
>>>
>>>> BTW, Tegra host also supports SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK for
>>>> data timeout based on host clock when using finite mode (HW busy
>>>> detection based on DATA TIMEOUT count value when cmd operation timeout
>>>> is < 11s for tegra host).
>>>>
>>>> So, looks like we cant set host max_busy_timeout to 0 for Tegra host to
>>>> force R1B during SWITCH and SLEEP_AWAKE.
>>>>
>>>> So, was thinking to introduce host capability MMC_CAP2_LONG_WAIT_HW_BUSY
>>>> which can be used for hosts supporting long or infinite HW busy wait
>>>> detection and will update mmc and mmc_ops drivers to not allow convert
>>>> R1B to R1B for hosts with this capability during SLEEP_AWAKE and SWITCH.
>>> That seems reasonable, it becomes probably both easier and clearer by
>>> adding a new host cap.
>>>
>>> In any case, let me help out and cook a patch for this for the core
>>> part (I leave the sdhci change to you). It may be a bit tricky,
>>> especially since I have currently queued a bunch of new changes for
>>> v5.7, that enables more users of mmc_poll_for_busy() in the core.
>>> Maybe I need to temporarily drop them, so we can fix these problems
>>> first. I will check.
>>>
>>> Probably, I would also name the cap MMC_CAP_HW_NEED_RSP_BUSY, as that
>>> seems to be describing the common problem we have for sdhci
>>> omap/tegra.
>>>
>>> Finally, it seems like MMC_CAP_WAIT_WHILE_BUSY should be set for
>>> sdhci- tegra, so while at it, perhaps you can cook a patch for that as
>>> well.
>>>
>>> Kind regards
>>> Uffe
>> OK, I sent v1 yesterday. Please ignore them then.
> Oh, I haven't seen them. In any case, I am ignoring them.
>
>> Will send out patches only for HW busy wait modes program based on cmd
>> timeout and WAIT_WHILE_BUSY enabled.
> Great, thanks!
>
> Please help test the series I just posted as well, if you have the
> time ofcourse.
>
> Kind regards
> Uffe

Sure,

Thanks

Sowjanya