From patchwork Mon Mar 13 07:32:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13171999 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 52D79C6FD19 for ; Mon, 13 Mar 2023 07:36:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Subject:From:CC:To:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=9WgtFxrcG8wPLvGaE6zzNMo71TZDZBfc6TGs1g19bqA=; b=ZAFEpCZm8uEOEV BGRqP89xPcnT98p8q/5DF6OTVBAE+I3N3aY9V7dfl1zDY2cTpbkYqtBc4tpXi1/HqD44nSKph6fLO 3q8bBo1hiiX6e4fG/lWyO0fbzh17NsdJ+fOHPBsH2lq8XCu7hTP0Xca+VmHgJrUBSP/cd5a2FSaGC bvSLkmWHiAVAkDC7D5gsTQwSv7ktOI5gr235WgCeGs6KpXvjqhzZxGOMpUf/RYFcF1v0eSJnSANu2 +MLkblZyYLIJFx4WkDekfGRIQeR4NBlncU9Md5OoVKUSrTmt0JHGBMLjIiFJWZut81WEDTHAB/5O4 iK8E+qJsFc9meqKLiHfA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pbcj6-004bp8-Rf; Mon, 13 Mar 2023 07:36:13 +0000 Received: from mx.sberdevices.ru ([45.89.227.171]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pbcj2-004bmO-CT; Mon, 13 Mar 2023 07:36:11 +0000 Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 2D79C5FD05; Mon, 13 Mar 2023 10:35:54 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1678692954; bh=MjAjGAw6favgxqmSJTuoTBm/E5xM29RbzZXGon97h6w=; h=Message-ID:Date:MIME-Version:To:From:Subject:Content-Type; b=oh9qrTNJ9QMW2wTJ71o5N2i2jED3ZWE+PGaj/AM0A8VuLm7PMBU+uq6iCIF8nmodA kT02E8P3l8jmy4jD7d4N6i2vDwsp7whiWKPG4dvsiAeMRx4jHQJ5R8NdqJWUumeQVY xmFmf8FgZ9Qn1GYB/9eR+LprBeZUXX4guRtgmqFH3IeLXaAXlvhbFlvZMf6n2jpod1 v5Vq7xo5/BCbyRPHhNMg1CnbTL4gETVbQu+/sl8FVIs95N492g8jTv+Sx56/0WP0Fj ytEUaYPy2EHRWvjtVWSq1WCXtajrjP4Q1NU5zSuWtrywkoQfrFCfE2/uYaVk9Alwuu abK+4fczzRR1A== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Mon, 13 Mar 2023 10:35:51 +0300 (MSK) Message-ID: Date: Mon, 13 Mar 2023 10:32:44 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Content-Language: en-US To: Liang Yang , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan CC: , , , , , From: Arseniy Krasnov Subject: [RFC PATCH v1] mtd: rawnand: meson: invalidate cache on polling ECC bit X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH02.sberdevices.ru (172.16.1.5) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/03/13 03:18:00 #20941028 X-KSMG-AntiVirus-Status: Clean, skipped X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230313_003608_926657_6CED3FD1 X-CRM114-Status: GOOD ( 11.79 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org 'info_buf' memory is cached and driver polls ECC bit in it. This bit is set by the NAND controller. If 'usleep_range()' returns before device sets this bit, 'info_buf' will be cached and driver won't see update of this bit and will loop forever. Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller") Signed-off-by: Arseniy Krasnov Reviewed-by: Neil Armstrong --- drivers/mtd/nand/raw/meson_nand.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index 5ee01231ac4c..2c05c08a0eaf 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -176,6 +176,7 @@ struct meson_nfc { dma_addr_t daddr; dma_addr_t iaddr; + u32 info_bytes; unsigned long assigned_cs; }; @@ -503,6 +504,7 @@ static int meson_nfc_dma_buffer_setup(struct nand_chip *nand, void *databuf, nfc->daddr, datalen, dir); return ret; } + nfc->info_bytes = infolen; cmd = GENCMDIADDRL(NFC_CMD_AIL, nfc->iaddr); writel(cmd, nfc->reg_base + NFC_REG_CMD); @@ -520,8 +522,10 @@ static void meson_nfc_dma_buffer_release(struct nand_chip *nand, struct meson_nfc *nfc = nand_get_controller_data(nand); dma_unmap_single(nfc->dev, nfc->daddr, datalen, dir); - if (infolen) + if (infolen) { dma_unmap_single(nfc->dev, nfc->iaddr, infolen, dir); + nfc->info_bytes = 0; + } } static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len) @@ -710,6 +714,8 @@ static void meson_nfc_check_ecc_pages_valid(struct meson_nfc *nfc, usleep_range(10, 15); /* info is updated by nfc dma engine*/ smp_rmb(); + dma_sync_single_for_cpu(nfc->dev, nfc->iaddr, nfc->info_bytes, + DMA_FROM_DEVICE); ret = *info & ECC_COMPLETE; } while (!ret); }