From patchwork Sun Nov 11 20:23:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 10677833 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0286F14BD for ; Sun, 11 Nov 2018 20:24:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E47102969C for ; Sun, 11 Nov 2018 20:24:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D635D296F9; Sun, 11 Nov 2018 20:24:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5DBF72969C for ; Sun, 11 Nov 2018 20:24:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731121AbeKLGOY (ORCPT ); Mon, 12 Nov 2018 01:14:24 -0500 Received: from mout.kundenserver.de ([212.227.126.130]:55747 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727302AbeKLGOY (ORCPT ); Mon, 12 Nov 2018 01:14:24 -0500 Received: from localhost.localdomain ([37.4.249.153]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1M2gt5-1gLeEL3aRD-004Dmn; Sun, 11 Nov 2018 21:24:31 +0100 From: Stefan Wahren To: Eric Anholt , Florian Fainelli , Ulf Hansson Cc: Phil Elwell , Michal Suchanek , linux-rpi-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH V2 2/7] mmc: bcm2835: Recover from MMC_SEND_EXT_CSD Date: Sun, 11 Nov 2018 21:23:54 +0100 Message-Id: <1541967839-2847-3-git-send-email-stefan.wahren@i2se.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1541967839-2847-1-git-send-email-stefan.wahren@i2se.com> References: <1541967839-2847-1-git-send-email-stefan.wahren@i2se.com> X-Provags-ID: V03:K1:qkVHDztQK9oM/OWH+6qWZI9LSuHRY1RpFpl+s2YKMs4d8oxk94x z+bRLCDAMoMZlHXwKf/J7SHvzs/39FUPM0YUYIjAKbX9PfQbvXfwMp8yk0aismQiLmHxBXt mCu+tsWxl2jhHzQcGszhLTMptHvXpxSgC2G4nTLQmAtw/n7EMkS8s0AovGX1VGAmokDvta5 ovG571r+AYzu/g2G3Z34g== X-UI-Out-Filterresults: notjunk:1;V01:K0:73XHbTz9krI=:EXicgjbIHFPLXK4C+Cbh1d ZEoUX1EO1rCXZ/WTWgFBtQn1XwLqTiTUC6LguT1TUI2grd5SIHYGOUlwn9/rofPw1gEB2NEV0 ckDVYe4cJvlfnqKVFZHd+hYO0KNYncxOfbOFSPaoknKGPK6zNWUx2yUPhZTe/UPeJEoxU+N+F ZZNalwF4gDtM0MfwgZWYJc/MQMTIZv2gtzvqakrYM/cBQpb00CLQmylHr7dDqX3oVRInx6Lcn Yq9wUxCFDzm1sX8ZCE41Rn1qiPiQKtfAaTG2APO0RDfsK46wg3M6FFltLjZdwNzDRYNHVnKea CEykG/WREPiwixVfxDike9pQtCELHAEBhnV+L/CpIBmWUb1rlBF/Yu6lRihSNd7DWzxQNmtTP 1edVD2GS6mieVL/SZDKReHD1gQwvI4Thyhm4//s8jQbuSb1VrXOAiafV4ZvSGGaCDP8Yr3yKd kB1/ED8SVgDxIpfOBN4hQ4GSsSk+FFXqJ5K4Cwa1GkJIPfw07eZ0Cy4EKuGeioSnswAyhFCFW h5jdWHo82dpilIkpAyyZbh/Z1yof6vBpgmffGY6UD0ueCujx4c7JuG3FWyB00p8n12cActtTC 8GVg58UnJ/BhkKTtAWvIBejfozCFYy+ICLziZvO3DiNBKfhfHZFWAgFnL+/ww2ZHRbAojHjuc 9QiDYkajywZfkj+njhOzlycNozd2b6C2lZIQerfkIqgoeSOiHhl6he/xXj1dEI8hYDhs83FYc tj5KY/AqfZLbGc2QYjrgwekBAm2fUaAndsrbiDy/ZIe+Uc/YThxgEaMwKq0sLRIj3/5DQ1gUt /KtLRv8M26NI5lRUzOa1BQV/QXYmw== Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Phil Elwell If the user issues an "mmc extcsd read", the SD controller receives what it thinks is a SEND_IF_COND command with an unexpected data block. The resulting operations leave the FSM stuck in READWAIT, a state which persists until the MMC framework resets the controller, by which point the root filesystem is likely to have been unmounted. A less heavyweight solution is to detect the condition and nudge the FSM by asserting the (self-clearing) FORCE_DATA_MODE bit. Link: https://github.com/raspberrypi/linux/issues/2728 Signed-off-by: Phil Elwell Signed-off-by: Stefan Wahren --- drivers/mmc/host/bcm2835.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index f1712df..a251be2 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -773,6 +773,8 @@ static void bcm2835_finish_command(struct bcm2835_host *host) if (!(sdhsts & SDHSTS_CRC7_ERROR) || (host->cmd->opcode != MMC_SEND_OP_COND)) { + u32 edm, fsm; + if (sdhsts & SDHSTS_CMD_TIME_OUT) { host->cmd->error = -ETIMEDOUT; } else { @@ -781,6 +783,13 @@ static void bcm2835_finish_command(struct bcm2835_host *host) bcm2835_dumpregs(host); host->cmd->error = -EILSEQ; } + edm = readl(host->ioaddr + SDEDM); + fsm = edm & SDEDM_FSM_MASK; + if (fsm == SDEDM_FSM_READWAIT || + fsm == SDEDM_FSM_WRITESTART1) + /* Kick the FSM out of its wait */ + writel(edm | SDEDM_FORCE_DATA_MODE, + host->ioaddr + SDEDM); bcm2835_finish_request(host); return; }