From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 168EFC43219 for ; Sat, 27 Apr 2019 19:02:21 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id CB4E32087E for ; Sat, 27 Apr 2019 19:02:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="X4InS3lI"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=cogentembedded-com.20150623.gappssmtp.com header.i=@cogentembedded-com.20150623.gappssmtp.com header.b="WIyeq621" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CB4E32087E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=cogentembedded.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=sufGnl22uMCQuiNhoM7jKvZUJGjiwSoxOvP1RbNJeB8=; b=X4InS3lIHJ/fAX V4B2TX3AyDSDGjuMKjk9N8RvJYlriBmRAgB7HWs+pqSQ7EG62eDCOs7hea80Fi3y8eBMgDsmZEHMX GnXsGHOzDo0+NyB46m4SE9xgMN+xqxkQjDYEYEWvSbSz+9vMZzKA26JCOPDAIYYNcmoGJNdkFuq/E JmzWOgbdtCjljPiSWmPEC4sV2N9QSlEQpWjiPNCHRowiJrMIsEmbVW9M9TRDLSayyCt3imo8Bd26I UdLxZfMaWwLuphTdH75TG3DMjuOdmJkRVd9QUeEJm9P4LRsYR23w2O5SajWcE8+9Cn/jllU8JWocv XGd46W42AWIMGrbNjTzg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKSaT-0003yV-U4; Sat, 27 Apr 2019 19:02:13 +0000 Received: from mail-lf1-x142.google.com ([2a00:1450:4864:20::142]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKSaQ-0003xK-0I for linux-arm-kernel@lists.infradead.org; Sat, 27 Apr 2019 19:02:11 +0000 Received: by mail-lf1-x142.google.com with SMTP id j11so4956396lfm.0 for ; Sat, 27 Apr 2019 12:02:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cogentembedded-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:organization:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=AZgxJWhbIDvKlGzRsWxiCN2W+xAkX6lkUd7t0yIDidU=; b=WIyeq621iyHX/Df/naNbN++OglZ6+VJNZpSAlZCMMzGDen3MlM7ODEgIJQ1XQ2Tsqe KoJUHEW44tSNFSyj1vxGoq7osfTu8C31TTPKvFDACvT5BT8pCNdNSulm6+SNzryjG0jJ ZHJEhTrup0ZDDiurfGdqH+hNSl0x8iXtHBqp64Hxkwc2ccRvHB3cPcalLC9kC/ghLcRc 35M5jbvnwnt3gTxeBiJwRtl/Nz9DCtpkHDDFc5i3HECb/37NvQFDD1RM9HKuhymhT1Lg 2P3C0WmTAv6VIGddHgt9HGv2f178ruKcl3BbINX6FItiTouYD86sr7pKClUmtBG6Mg8y GyVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=AZgxJWhbIDvKlGzRsWxiCN2W+xAkX6lkUd7t0yIDidU=; b=nxa6we+m7qv5VuDHMt0PPhHTFZEBztREKeMkDNv8MDJqdqdJFkGFqLOf/3ra+c7zv8 yI75GQUClYGvMXT3QTXSL+dT18jl3OwrGnRf/WbfX+ztS/62N7xBsCfO58jal2u1fimQ 9uiqBmNOY7XJWpQL0euBnb2IVJ4MgONDEK2N6TtsHWotm5iRpT6a8HB3tdxzHKqPQ5KD NFTu3PukA4NXnYhqNW6VmQQ61psq/gi5+Fj0W5ZSVFYBRc5Hj9lrSoF4ZhI6aqIGua8X aV7QNWU0YHnRQlcH0/pgFp+BLu1f26c+AHwiCGRjH66sAa9rG+EUOSpVnQET4nkvZYe2 C+pw== X-Gm-Message-State: APjAAAWNFTr2b8zwHbEz0RBArUAE930vF8q4O6qv3Y0qCsZ5c1EitS7i pae6IKvdcST9tvkKGTnW9XC8zA== X-Google-Smtp-Source: APXvYqzzsRMRu10ni8xp9BNlmHXddNxg6m8pR41FcPmRC7oDP+jBy5UZJMOqZ/1dKJN8fNr7zihdcA== X-Received: by 2002:a19:428c:: with SMTP id p134mr29296072lfa.108.1556391727674; Sat, 27 Apr 2019 12:02:07 -0700 (PDT) Received: from wasted.cogentembedded.com ([31.173.81.185]) by smtp.gmail.com with ESMTPSA id x2sm1199162ljx.13.2019.04.27.12.02.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 27 Apr 2019 12:02:07 -0700 (PDT) Subject: Re: [PATCH v4 1/5] mtd: cfi_cmdset_0002: Add support for polling status register To: Vignesh Raghavendra , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Rob Herring References: <20190423104814.5762-1-vigneshr@ti.com> <20190423104814.5762-2-vigneshr@ti.com> From: Sergei Shtylyov Organization: Cogent Embedded Message-ID: <093ef590-ae3d-2db2-09af-573a138a9416@cogentembedded.com> Date: Sat, 27 Apr 2019 22:02:05 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20190423104814.5762-2-vigneshr@ti.com> Content-Language: en-MW X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190427_120210_173625_101E10FF X-CRM114-Status: GOOD ( 24.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Tudor Ambarus , nsekhar@ti.com, linux-kernel@vger.kernel.org, Joakim Tjernlund , linux-mtd@lists.infradead.org, Miquel Raynal , Mason Yang , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello! On 04/23/2019 01:48 PM, Vignesh Raghavendra wrote: > HyperFlash devices are compliant with CFI AMD/Fujitsu Extended Command > Set(0x0002) for flash operations, therefore drivers/mtd/chips/cfi_cmdset_0002.c > can be used as is. But these devices do not support DQ polling method of > determining chip ready/good status. These flashes provide Status > Register whose bits can be polled to know status of flash operation. > > Cypress HyperFlash datasheet here[1], talks about CFI Amd/Fujitsu > Extended Query version 1.5. Bit 0 of "Software Features supported" field > of CFI Primary Vendor-Specific Extended Query table indicates > presence/absence of status register and Bit 1 indicates whether or not > DQ polling is supported. Using these bits, its possible to determine > whether flash supports DQ polling or need to use Status Register. > > Add support for polling Status Register to know device ready/status of > erase/write operations when DQ polling is not supported. > Print error messages on erase/program failure by looking at related > Status Register bits. > > [1] https://www.cypress.com/file/213346/download > > Signed-off-by: Vignesh Raghavendra Sorry, only superficial review, I'm not an MTD expert. :-) > --- > drivers/mtd/chips/cfi_cmdset_0002.c | 90 +++++++++++++++++++++++++++++ > include/linux/mtd/cfi.h | 5 ++ > 2 files changed, 95 insertions(+) > > diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c > index 7b7286b4d81e..55c4d81098d5 100644 > --- a/drivers/mtd/chips/cfi_cmdset_0002.c > +++ b/drivers/mtd/chips/cfi_cmdset_0002.c > @@ -49,6 +49,16 @@ > #define SST49LF008A 0x005a > #define AT49BV6416 0x00d6 > > +/* > + * Status Register bit description. Used by flash devices that don't > + * support DQ polling (Eg.: HyperFlash) It's "e.g. " :-) [...] > @@ -97,6 +107,48 @@ static struct mtd_chip_driver cfi_amdstd_chipdrv = { > .module = THIS_MODULE > }; > > +/* > + * Use status register to poll for Erase/write completion when DQ is not > + * supported. This is indicated by Bit[1:0] of SoftwareFeatures field in > + * CFI Primary Vendor-Specific Extended Query table 1.5 > + */ > +static int cfi_use_status_reg(struct cfi_private *cfi) > +{ > + struct cfi_pri_amdstd *extp = cfi->cmdset_priv; > + > + return (extp->MinorVersion >= '5') && Parens not needed here, especially as the next operator isn't enclosed. > + (extp->SoftwareFeatures & 0x3) == 0x1; > +} [...] MBR, Sergei _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel