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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 375A6C46470 for ; Tue, 7 Aug 2018 17:10:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E549021731 for ; Tue, 7 Aug 2018 17:10:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="E2j2hXEs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E549021731 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390074AbeHGTZl (ORCPT ); Tue, 7 Aug 2018 15:25:41 -0400 Received: from mail-lj1-f193.google.com ([209.85.208.193]:42009 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390037AbeHGTZl (ORCPT ); Tue, 7 Aug 2018 15:25:41 -0400 Received: by mail-lj1-f193.google.com with SMTP id f1-v6so14004052ljc.9; Tue, 07 Aug 2018 10:10:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=TEmzIpIJeMrr/tbenoFGx1EzF3o0ZISrz/y0iiZYYJc=; b=E2j2hXEsNrz7WNhQbvmTnlaID86uTIVE7wC5KjXGn64d/DthsNiXGvoyDuVSTEWY+F BPTxnlhaik2yYSOANh+oNBeh1WXAC3anJ/g0PAvoZzRM3WTGrfFnTTbctPtexddCAFcP nSPfYpuz2FhYHZgDAW6Squ7zpw1q3MaEjIHeSggBZHx+EARbHEg5K2uvK4fUS9ttWTRq c+OHw1ad8sDGSIP3Dq94rRLnftWvZKtNimoCJOscBB7BgXX0e0B3DLs6vJVaQh67zSWh incW7WhrCH7/1cJxgfA4xlgB5XO1Mr4Y2xBJHeb/PO2HE8Gg2mo/aDaBcA/0yhhlYehb SpEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=TEmzIpIJeMrr/tbenoFGx1EzF3o0ZISrz/y0iiZYYJc=; b=crrOxGUkNO1N1cnFNf3QUJEZgrWp4QOXp8DrDAvuhaKYy/gYGBXB7u53qVtWYel6rI 6fm75ZzewqKH2irsswMIw1yDITuheBmd5XcvHXTI9joS1k2cVDb2oHpKAVVHl9Hao+vL 77o9A80+PoOq0SBJf+ohN31dPUpYcTDanK03/b0gQrT4fXDTe4aJLaw7CfjTaphc0jPp b4k2Ud78sSGGU2XAbydlNrCa5/zHv5aQR+txdW50SJRodtzXOJv+xiUgy9pjcDDTcS1p lAFv7cxvJd//sNXKZNkpMuA7dwYI+/BbX/65LI6qr7puluiBACPxQyyqgtq1CFw10Czj TvPQ== X-Gm-Message-State: AOUpUlE6Jj+ppyDiKbNYmvRe35Ur+Cy/1rUdFdM+snKTDfSarXfnhmWM nUxm2Yg7Lf/8zKtnOIeOTSM= X-Google-Smtp-Source: AAOMgpenz6j3OSFJmb831uDvT6MeTmQEzURgrDRCHtzPs0fONdMRNGmviLWlAVjYTvsM4poY7IonrA== X-Received: by 2002:a2e:1301:: with SMTP id 1-v6mr15545786ljt.56.1533661822563; Tue, 07 Aug 2018 10:10:22 -0700 (PDT) Received: from z50.localnet (93-181-165-181.internetia.net.pl. [93.181.165.181]) by smtp.gmail.com with ESMTPSA id f18-v6sm325264lja.85.2018.08.07.10.10.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 07 Aug 2018 10:10:21 -0700 (PDT) From: Janusz Krzysztofik To: Boris Brezillon Cc: Linus Walleij , Jonathan Corbet , Miquel Raynal , Richard Weinberger , David Woodhouse , Brian Norris , Marek Vasut , Tony Lindgren , Aaro Koskinen , linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-mtd@lists.infradead.org, linux-doc@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Janusz Krzysztofik Subject: Re: [RFC PATCH v2 05/12] mtd: rawnand: ams-delta: use GPIO API for data read/write Date: Tue, 07 Aug 2018 19:11:22 +0200 Message-ID: <1593487.Cmi0mten1c@z50> In-Reply-To: <20180807190627.4340aade@bbrezillon> References: <20180718235710.18242-1-jmkrzyszt@gmail.com> <20180806222918.12644-6-jmkrzyszt@gmail.com> <20180807190627.4340aade@bbrezillon> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Boris, On Tuesday, August 7, 2018 7:06:27 PM CEST Boris Brezillon wrote: > On Tue, 7 Aug 2018 00:29:11 +0200 > Janusz Krzysztofik wrote: > > > Don't readw()/writew() data directly from/to GPIO port which is under > > control of gpio-omap driver, use GPIO API instead. > > > > Degrade of performance on Amstrad Delta is completely not acceptable. > > Can we have numbers along with information about where the overhead is > when using gpiod_{get,set}_raw_array_value()? Yes, as soon as I get physical access to the device, probably this or next weekend. Thanks, Janusz