From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZpfj2R9NBrBRAPrdeiFgo6MifcGT28Q2HBOUPWKNqwq+mkxBAgzro4nfRxBaqr3brO1zRrP ARC-Seal: i=1; a=rsa-sha256; t=1526281164; cv=none; d=google.com; s=arc-20160816; b=mj4Wgo02tioJUmo2UgZi+b9uMbodw8tIU8aQncG5d0S3dDkIufmHbt/HYyqzSmmn7k UF9QPQso1EiQbb5qTcQ/N0zfM031mPaLhC42oSXKaqXJZglMxFwr7Zqq3Z7ukM+zDe6z hX4f5NjYqhtEwvXPtV3ZMYvx/2JyDVeHBI33GRCVJ4dWYyrzlAzlTBYbV5P6tydqu+Tn enRr/ek9DARCcogXFOZTCWeyGbvQfK1JhFbeyYuGGRLT9urVlFRcsjceDiUCKpIFihgo zsLyOOAcoPH25t75bospeeHO388DJ2t8Abksz61UgekO1+xJ6ABYULur4J/qBs8L9Dz9 2acA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=LR/Y05Ur6lG4rVd3g8YiojBiPiFENRFPTe7bwPx10oo=; b=iwCG8VQf6rN0BH8dZ+2ouQoKiYWhUvS1tcbZWg1gCjmT3Qe/H+7hZchNBIEQme/g2S FXTF2DWtOLvZ1lq49Eq1viIG77ch3zfFskZeUuLA1yNtFdZeYKWYXl64yRWz4BuivC2W aArgvBySCiclrnrz12xtnxUeG4wUU4BAPpaGc2OroZtGqOh2QpfDfj7DSpl/5pHr24o1 UOp2/nA2aujBQsXGqVcQQhbueyh+ybz3Jni1ILSkNMXzGuGJxmpMmGEqZAZvAKlAR6tB 9tlzU0GCF9TgPtjIn28W2acgssk6oGjQJCY6XLuIZCpVbGX+4vGWOyKFC3bOCnGSpY/M vCIg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oPWEeukP; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oPWEeukP; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Boris Brezillon , Miquel Raynal Subject: [PATCH 4.16 41/72] mtd: rawnand: Make sure we wait tWB before polling the STATUS reg Date: Mon, 14 May 2018 08:48:58 +0200 Message-Id: <20180514064824.942453369@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180514064823.033169170@linuxfoundation.org> References: <20180514064823.033169170@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1600421798169787074?= X-GMAIL-MSGID: =?utf-8?q?1600421798169787074?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Boris Brezillon commit 3057fcef385348fe85173f1b0c824d89f1176f72 upstream. NAND chips require a bit of time to take the NAND operation into account and set the BUSY bit in the STATUS reg. Make sure we don't poll the STATUS reg too early in nand_soft_waitrdy(). Fixes: 8878b126df76 ("mtd: nand: add ->exec_op() implementation") Cc: Signed-off-by: Boris Brezillon Acked-by: Miquel Raynal Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/nand_base.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -707,12 +707,17 @@ static void nand_wait_status_ready(struc */ int nand_soft_waitrdy(struct nand_chip *chip, unsigned long timeout_ms) { + const struct nand_sdr_timings *timings; u8 status = 0; int ret; if (!chip->exec_op) return -ENOTSUPP; + /* Wait tWB before polling the STATUS reg. */ + timings = nand_get_sdr_timings(&chip->data_interface); + ndelay(PSEC_TO_NSEC(timings->tWB_max)); + ret = nand_status_op(chip, NULL); if (ret) return ret;