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=-16.7 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,URIBL_BLOCKED, USER_AGENT_SANE_1 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 66E1DC432BE for ; Fri, 20 Aug 2021 11:03:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5241060FE8 for ; Fri, 20 Aug 2021 11:03:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239298AbhHTLEV (ORCPT ); Fri, 20 Aug 2021 07:04:21 -0400 Received: from mga09.intel.com ([134.134.136.24]:45636 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239799AbhHTLES (ORCPT ); Fri, 20 Aug 2021 07:04:18 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10081"; a="216753593" X-IronPort-AV: E=Sophos;i="5.84,337,1620716400"; d="scan'208";a="216753593" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2021 04:03:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,337,1620716400"; d="scan'208";a="680059878" Received: from ahunter-desktop.fi.intel.com (HELO [10.237.72.174]) ([10.237.72.174]) by fmsmga006.fm.intel.com with ESMTP; 20 Aug 2021 04:03:38 -0700 Subject: Re: [PATCH] mmc: sdhci: correct the tuning command handle for PIO mode To: haibo.chen@nxp.com, ulf.hansson@linaro.org, linux-mmc@vger.kernel.org Cc: linux-imx@nxp.com References: <1628858041-1911-1-git-send-email-haibo.chen@nxp.com> From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Message-ID: <76af88e2-d068-dafc-9b17-cd590b3f8953@intel.com> Date: Fri, 20 Aug 2021 14:04:13 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <1628858041-1911-1-git-send-email-haibo.chen@nxp.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org On 13/08/21 3:34 pm, haibo.chen@nxp.com wrote: > From: Haibo Chen > > If sdhci use PIO mode, and use mmc_send_tuning() to send the > tuning command, system will stuck because of the storm irq > of sdhci. For PIO mode, use mmc_send_tuning(), it will trigger > buffer_read_ready interrupt and data transfer complete interrupt. > In current code logic, it will directly return in sdhci_data_irq, > can not call the sdhci_transfer_pio(). So the buffer_read_ready > interrupt storm happen. So for standard tuning method, need to > excluse this case. > > Signed-off-by: Haibo Chen Acked-by: Adrian Hunter > --- > drivers/mmc/host/sdhci.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index aba6e10b8605..acee54b368b0 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -3278,8 +3278,14 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) > { > u32 command; > > - /* CMD19 generates _only_ Buffer Read Ready interrupt */ > - if (intmask & SDHCI_INT_DATA_AVAIL) { > + /* > + * CMD19 generates _only_ Buffer Read Ready interrupt if > + * use sdhci_send_tuning. > + * Need to exclude this case: PIO mode and use mmc_send_tuning, > + * If not, sdhci_transfer_pio will never be called, make the > + * SDHCI_INT_DATA_AVAIL always there, stuck in irq storm. > + */ > + if ((intmask & SDHCI_INT_DATA_AVAIL) && (!host->data)) { > command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)); > if (command == MMC_SEND_TUNING_BLOCK || > command == MMC_SEND_TUNING_BLOCK_HS200) { >