From patchwork Thu Mar 24 13:27:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 554159 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 CA03FC433F5 for ; Thu, 24 Mar 2022 13:27:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350440AbiCXN30 convert rfc822-to-8bit (ORCPT ); Thu, 24 Mar 2022 09:29:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236979AbiCXN3Z (ORCPT ); Thu, 24 Mar 2022 09:29:25 -0400 Received: from mail3.swissbit.com (mail3.swissbit.com [176.95.1.57]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 122F5A7752; Thu, 24 Mar 2022 06:27:53 -0700 (PDT) Received: from mail3.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id 4D158463187; Thu, 24 Mar 2022 14:27:52 +0100 (CET) Received: from mail3.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id 39E494616CC; Thu, 24 Mar 2022 14:27:52 +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 mail3.swissbit.com (Postfix) with ESMTPS; Thu, 24 Mar 2022 14:27:52 +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; Thu, 24 Mar 2022 14:27:51 +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; Thu, 24 Mar 2022 14:27:51 +0100 From: =?iso-8859-1?q?Christian_L=F6hle?= To: Ulf Hansson , "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , Adrian Hunter CC: "andriy.shevchenko@linux.intel.com" Subject: [PATCHv4] mmc: block: Check for errors after write on SPI Thread-Topic: [PATCHv4] mmc: block: Check for errors after write on SPI Thread-Index: AQHYP4LoJDVQhv4pEEGn8CEDydpuCg== Date: Thu, 24 Mar 2022 13:27:51 +0000 Message-ID: <8052f30adc3747e2beab0e52db26837d@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-5.1-8.6.1018-26790.007 X-TMASE-Result: 10--2.484200-10.000000 X-TMASE-MatchedRID: LVkZzMT5mEprFdvBEmTnvLZ0InVwVLVTn5nfR7I2dFOxPXYIh1l6dlg7 cH4SOkOpdWqA+wY3gFZusJxXwmCOnpDH5Y6LoY7BRZfQN+FVqbA1kR+05VC1hsiCh8yBqE+tbiP oclJOCy0MV38Bdz1rogpwpdIIi4oJCtNdSL7NMxRO5y1KmK5bJRSLgSFq3Tnj31GU/N5W5BDfal dUczBqFzyK8WRp1qJNDyVcDYF9X2gcQvLacRAgcPCW/PNRRp/ZeLLCA0PD7aiOS54Qk4fByRJd3 nIYBNFRvAQxPUzd//aAUraeY8ICeWgwIvLATTKBC24oEZ6SpSkj80Za3RRg8AGbCVwhBdklXd/S v5c5PCnllp9J9eYRW2D45hQmnPpeEze1V/T0TyU= X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 X-TMASE-INERTIA: 0-0;;;; X-TMASE-XGENCLOUD: c9886a10-9435-4c3c-a01a-f170bc255192-0-0-200-0 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 v3: - Move the logic into its own function v4: - Move block layer handling out of the spi-specific function drivers/mmc/core/block.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 4e67c1403cc9..7272db0042fd 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -1880,6 +1880,32 @@ static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq) brq->data.error || brq->cmd.resp[0] & CMD_ERRORS; } +static int mmc_spi_err_check(struct mmc_card *card) +{ + u32 status = 0; + int err; + + /* + * 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. + */ + err = __mmc_send_status(card, &status, 0); + /* All R1 and R2 bits of SPI are errors in our case */ + if (err || status) { + if (err) + return err; + return -EIO; + } + return 0; +} + static int mmc_blk_busy_cb(void *cb_data, bool *busy) { struct mmc_blk_busy_data *data = cb_data; @@ -1903,9 +1929,16 @@ 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; + if (mmc_host_is_spi(card->host)) { + err = mmc_spi_err_check(card); + if (err) + mqrq->brq.data.bytes_xfered = 0; + return err; + } + cb_data.card = card; cb_data.status = 0; err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,