From patchwork Wed Mar 23 14:12:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 554163 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02606C433F5 for ; Wed, 23 Mar 2022 14:12:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236994AbiCWOOS convert rfc822-to-8bit (ORCPT ); Wed, 23 Mar 2022 10:14:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240717AbiCWOOP (ORCPT ); Wed, 23 Mar 2022 10:14:15 -0400 Received: from mail4.swissbit.com (mail4.swissbit.com [176.95.1.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F8163DA66; Wed, 23 Mar 2022 07:12:46 -0700 (PDT) Received: from mail4.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id D6223122FBB; Wed, 23 Mar 2022 15:12:43 +0100 (CET) Received: from mail4.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id C4784122DBF; Wed, 23 Mar 2022 15:12:43 +0100 (CET) X-TM-AS-ERS: 10.149.2.84-127.5.254.253 X-TM-AS-SMTP: 1.0 ZXguc3dpc3NiaXQuY29t Y2xvZWhsZUBoeXBlcnN0b25lLmNvbQ== X-DDEI-TLS-USAGE: Used Received: from ex.swissbit.com (SBDEEX02.sbitdom.lan [10.149.2.84]) by mail4.swissbit.com (Postfix) with ESMTPS; Wed, 23 Mar 2022 15:12:43 +0100 (CET) Received: from sbdeex02.sbitdom.lan (10.149.2.84) by sbdeex02.sbitdom.lan (10.149.2.84) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 23 Mar 2022 15:12:43 +0100 Received: from sbdeex02.sbitdom.lan ([fe80::e0eb:ade8:2d90:1f74]) by sbdeex02.sbitdom.lan ([fe80::e0eb:ade8:2d90:1f74%8]) with mapi id 15.02.0986.022; Wed, 23 Mar 2022 15:12:43 +0100 From: =?iso-8859-1?q?Christian_L=F6hle?= To: "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , Ulf Hansson , Adrian Hunter , "andriy.shevchenko@linux.intel.com" , "cloehle@posteo.de" CC: Avri Altman , "david-b@pacbell.net" Subject: [PATCHv2] mmc: block: Check for errors after write on SPI Thread-Topic: [PATCHv2] mmc: block: Check for errors after write on SPI Thread-Index: AQHYPsAQB7Ge7QSFOEmDJ2kn629cyA== Date: Wed, 23 Mar 2022 14:12:43 +0000 Message-ID: References: <9d1ea819e4bb4222a227a02d5f6ad97c@hyperstone.com> In-Reply-To: <9d1ea819e4bb4222a227a02d5f6ad97c@hyperstone.com> Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.154.1.4] MIME-Version: 1.0 X-TMASE-Version: DDEI-5.1-8.6.1018-26790.000 X-TMASE-Result: 10--2.793200-10.000000 X-TMASE-MatchedRID: 0aps3uOmWi5rFdvBEmTnvLZ0InVwVLVTn5nfR7I2dFOxPXYIh1l6dlg7 cH4SOkOpdWqA+wY3gFZusJxXwmCOnpDH5Y6LoY7BRZfQN+FVqbA1kR+05VC1hsiCh8yBqE+tbiP oclJOCy0MV38Bdz1roh5HSIAURpXTL/tBTZzO5Q0D2WXLXdz+Afb991FvFjWAd3XtjqAaoMLBTP qP0WxWQAGRC3bBIF8o0+pR+Ea5cIJI5l15C51feb+viKbH3Jj7+VJ6lZyB0s/3K1BQq7xa/qPFj JEFr+olIoOsWgr8s12OhzOa6g8KrfVs4fo5Jz/CFFjqD8M1Htc+HGIjyd7T85t1B6KjWowdgKQB rzCcMVk= X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 X-TMASE-INERTIA: 0-0;;;; X-TMASE-XGENCLOUD: c45e74ff-0bbe-40a2-b079-69b958a98b15-0-0-200-0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Introduce a SEND_STATUS check for writes through SPI to not mark an unsuccessful write as successful. Since SPI SD/MMC does not have states, after a write, the card will just hold the line LOW until it is ready again. The driver marks the write therefore as completed as soon as it reads something other than all zeroes. The driver does not distinguish from a card no longer signalling busy and it being disconnected (and the line being pulled-up by the host). This lead to writes being marked as successful when disconnecting a busy card. Now the card is ensured to be still connected by an additional CMD13, just like non-SPI is ensured to go back to TRAN state. While at it and since we already poll for the post-write status anyway, we might as well check for SPIs error bits (any of them). The disconnecting card problem is reproducable for me after continuous write activity and randomly disconnecting, around every 20-50 tries on SPI DS for some card. Fixes: 7213d175e3b6f ("MMC/SD card driver learns SPI") Cc: stable@vger.kernel.org Signed-off-by: Christian Loehle --- v2: - Reorder err and status check for err to take precedence and look cleaner drivers/mmc/core/block.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 4e67c1403cc9..54c2009f398f 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -1903,9 +1903,34 @@ static int mmc_blk_card_busy(struct mmc_card *card, struct request *req) struct mmc_blk_busy_data cb_data; int err; - if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ) + if (rq_data_dir(req) == READ) return 0; + /* + * SPI does not have a TRAN state we have to wait on, instead the + * card is ready again when it no longer holds the line LOW. + * We still have to ensure two things here before we know the write + * was successful: + * 1. The card has not disconnected during busy and we actually read our + * own pull-up, thinking it was still connected, so ensure it + * still responds. + * 2. Check for any error bits, in particular R1_SPI_IDLE to catch a + * just reconnected card after being disconnected during busy. + */ + if (mmc_host_is_spi(card->host)) { + u32 status = 0; + + err = __mmc_send_status(card, &status, 0); + /* All R1 and R2 bits of SPI are errors in our case */ + if (err || status) { + mqrq->brq.data.bytes_xfered = 0; + if (err) + return err; + return -EIO; + } + return 0; + } + cb_data.card = card; cb_data.status = 0; err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,