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=-6.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 22580C433DF for ; Tue, 20 Oct 2020 03:52:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C41382244C for ; Tue, 20 Oct 2020 03:52:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391330AbgJTDwt convert rfc822-to-8bit (ORCPT ); Mon, 19 Oct 2020 23:52:49 -0400 Received: from mail-lf1-f68.google.com ([209.85.167.68]:40042 "EHLO mail-lf1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391321AbgJTDwt (ORCPT ); Mon, 19 Oct 2020 23:52:49 -0400 Received: by mail-lf1-f68.google.com with SMTP id a9so321401lfc.7; Mon, 19 Oct 2020 20:52:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=QSKcWCkaOciBpr52CFiHddOWbs/SRgpSc2aqm5gms6Y=; b=poYJzxodG2eX4Awb2Gph+GfF8idgxItMAw8PHRI7jeuUOIj3i+N1vrzTB9mWv4c385 zjfyb3YJUrkadtE2pukTGe/1sHUqqmLYLRF9HVqGSPAnvEQU39d1Hll28Sg5HBwFvVjX 82aSkZXBmykksFyvZOQ5XAqDRG0PfP+6Iy/E1NtlzXmS35FrPPQuZBCHTzGOOTTyH7An rQwq/k+lFqiiNYHwePXQKcTaXcuKxYF0pBpgPmJWSa6impu4bxXjPc1dL4heF8JboXcy 0z4YYYB1CH5Q1wltVSm+hInJsKY9tuHUde3I8EPw8+6ekGvxCJQlKH1P4VsFxJZIBR8F M+Ag== X-Gm-Message-State: AOAM531Ssj5LCNpz8NIMRVuzX/YAMSsqsZh4K0eZ0EDmANsqcb4Ski2z +NGtrJDy69s/xo2Zh0R/p4qBpCkMXOKB7A== X-Google-Smtp-Source: ABdhPJz3Q21Wwn0jy/k4+bMme03BagKlnkEBrWvKmoeDAb30gmiertlJS74UBreq7SbXez2TdmPRSQ== X-Received: by 2002:a19:838e:: with SMTP id f136mr240994lfd.16.1603165966339; Mon, 19 Oct 2020 20:52:46 -0700 (PDT) Received: from mail-lf1-f46.google.com (mail-lf1-f46.google.com. [209.85.167.46]) by smtp.gmail.com with ESMTPSA id r80sm83454lff.284.2020.10.19.20.52.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2020 20:52:46 -0700 (PDT) Received: by mail-lf1-f46.google.com with SMTP id d24so320342lfa.8; Mon, 19 Oct 2020 20:52:45 -0700 (PDT) X-Received: by 2002:a19:c88c:: with SMTP id y134mr230506lff.283.1603165965810; Mon, 19 Oct 2020 20:52:45 -0700 (PDT) MIME-Version: 1.0 References: <20201015154740.20825-1-al.kochet@gmail.com> <20201019082129.myxpxla5xwoqwldo@gilmour.lan> <4EC91DD5-5611-4B48-B6FC-00690B400584@gmail.com> In-Reply-To: <4EC91DD5-5611-4B48-B6FC-00690B400584@gmail.com> From: Chen-Yu Tsai Date: Tue, 20 Oct 2020 11:52:34 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] spi: spi-sun6i: implement DMA-based transfer mode To: Alexander Kochetkov Cc: Maxime Ripard , Mark Brown , linux-spi@vger.kernel.org, linux-arm-kernel , linux-kernel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 20, 2020 at 1:43 AM Alexander Kochetkov wrote: > > > > > 19 окт. 2020 г., в 11:21, Maxime Ripard написал(а): > > > > Hi! > > > > On Thu, Oct 15, 2020 at 06:47:40PM +0300, Alexander Kochetkov wrote: > >> DMA-based transfer will be enabled if data length is larger than FIFO size > >> (64 bytes for A64). This greatly reduce number of interrupts for > >> transferring data. > >> > >> For smaller data size PIO mode will be used. In PIO mode whole buffer will > >> be loaded into FIFO. > >> > >> If driver failed to request DMA channels then it fallback for PIO mode. > >> > >> Tested on SOPINE (https://www.pine64.org/sopine/) > >> > >> Signed-off-by: Alexander Kochetkov > > > > Thanks for working on this, it's been a bit overdue > > Hi, Maxime! > > We did custom A64 based computation module for our product. > Do you mean that A64 is obsolete or EOL product? > If so, can you recommend active replacement for A64 from Allwinner same price? I believe what Maxime meant was that DMA transfer for SPI is a long sought-after feature, but no one had finished it. ChenYu 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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 CCBBAC433E7 for ; Tue, 20 Oct 2020 03:54:31 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 48E7A2244C for ; Tue, 20 Oct 2020 03:54:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="E5kma973" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 48E7A2244C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csie.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ycHsa0zkuFRxMMidcqtMeiZYVPZHPaqoVJbBQMhA3TY=; b=E5kma973XCpN4TcgZK/EL6CxI kCFwn125jbgO42ztVd3DVREgJmWBHO7wPXLAoPgzgxAkGbtkKirIE4YrQfuKZ6olIZhEr3M/5Oihd NWLuydobbpoPS095clNeH2dgJxe+l8CBkwwQ6RcJuC01YL3gaT6IcIq1yNpE2CLFiNM7zU3gKcxHq gpWqFW6TCpQMDziJ7a3fPNXJY9WlMLliXYMx9dAdVWvxTBefdQdTvLJC+NqckEfdqS47QQm2l+riY m7hLhINoT9IvS7nr3+EzRRycK40eOCS7NT7G80oDBnS6ygoC6kUHuz0FyBglLN8LSyMavA8Ke/Fcw 5OLoFyczw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kUihg-00030t-0b; Tue, 20 Oct 2020 03:52:52 +0000 Received: from mail-lf1-f67.google.com ([209.85.167.67]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kUihc-00030U-3R for linux-arm-kernel@lists.infradead.org; Tue, 20 Oct 2020 03:52:49 +0000 Received: by mail-lf1-f67.google.com with SMTP id v6so295363lfa.13 for ; Mon, 19 Oct 2020 20:52:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=QSKcWCkaOciBpr52CFiHddOWbs/SRgpSc2aqm5gms6Y=; b=JO6KoSuzA6+GY9IzmLJUggs4FnJ9u0iU/Pin2RRhirsBzeTBupfHUsfuZRPeb2+Y9F /ieKzIHV4bvWSJyB9Jjbh8ii/Dq6TAaUCwcyB14pdgMKHin8yCM8tjUrTcyCzJXjd17t 4U1P11b+LV1kOF3CanVg+K0j1zo08BzMloAHP8wfIV4CR9mrglUkK2KggJDgrv6TJnIE kRuLFq8hB2PtThlgb5OixV1oVYwSThCINwk8nfn/MzOoVSHhyIhY4TDExsR98ZD4U6bw l5GW3pRN/EceV8X9tumfAHFA394R8xhzGUa60IcM7RIP1tRKeF7BIdncAAoiJYXv+E2v O9Ug== X-Gm-Message-State: AOAM533zn33APbKru4xDpBM/ol7/6bHdRE1dnMlVFRH5DapMjeVGlJob G+KlOXPcJxidqXPRO9BYJDWnSAIYXosrZw== X-Google-Smtp-Source: ABdhPJwWTjNSVBqy9pPTtrvdDpGrypdWyHku//4fxAUo7TH6Pl/jj5ym4hrPY9B8DX0sYrVctebhvQ== X-Received: by 2002:a19:f113:: with SMTP id p19mr239172lfh.137.1603165966458; Mon, 19 Oct 2020 20:52:46 -0700 (PDT) Received: from mail-lf1-f52.google.com (mail-lf1-f52.google.com. [209.85.167.52]) by smtp.gmail.com with ESMTPSA id q16sm135368ljj.32.2020.10.19.20.52.45 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2020 20:52:46 -0700 (PDT) Received: by mail-lf1-f52.google.com with SMTP id z2so347888lfr.1 for ; Mon, 19 Oct 2020 20:52:45 -0700 (PDT) X-Received: by 2002:a19:c88c:: with SMTP id y134mr230506lff.283.1603165965810; Mon, 19 Oct 2020 20:52:45 -0700 (PDT) MIME-Version: 1.0 References: <20201015154740.20825-1-al.kochet@gmail.com> <20201019082129.myxpxla5xwoqwldo@gilmour.lan> <4EC91DD5-5611-4B48-B6FC-00690B400584@gmail.com> In-Reply-To: <4EC91DD5-5611-4B48-B6FC-00690B400584@gmail.com> From: Chen-Yu Tsai Date: Tue, 20 Oct 2020 11:52:34 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] spi: spi-sun6i: implement DMA-based transfer mode To: Alexander Kochetkov X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201019_235248_171249_817536FB X-CRM114-Status: GOOD ( 17.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel , Mark Brown , Maxime Ripard , linux-arm-kernel , linux-spi@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBPY3QgMjAsIDIwMjAgYXQgMTo0MyBBTSBBbGV4YW5kZXIgS29jaGV0a292IDxhbC5r b2NoZXRAZ21haWwuY29tPiB3cm90ZToKPgo+Cj4KPiA+IDE5INC+0LrRgi4gMjAyMCDQsy4sINCy IDExOjIxLCBNYXhpbWUgUmlwYXJkIDxtYXhpbWVAY2Vybm8udGVjaD4g0L3QsNC/0LjRgdCw0Lso 0LApOgo+ID4KPiA+IEhpIQo+ID4KPiA+IE9uIFRodSwgT2N0IDE1LCAyMDIwIGF0IDA2OjQ3OjQw UE0gKzAzMDAsIEFsZXhhbmRlciBLb2NoZXRrb3Ygd3JvdGU6Cj4gPj4gRE1BLWJhc2VkIHRyYW5z ZmVyIHdpbGwgYmUgZW5hYmxlZCBpZiBkYXRhIGxlbmd0aCBpcyBsYXJnZXIgdGhhbiBGSUZPIHNp emUKPiA+PiAoNjQgYnl0ZXMgZm9yIEE2NCkuIFRoaXMgZ3JlYXRseSByZWR1Y2UgbnVtYmVyIG9m IGludGVycnVwdHMgZm9yCj4gPj4gdHJhbnNmZXJyaW5nIGRhdGEuCj4gPj4KPiA+PiBGb3Igc21h bGxlciBkYXRhIHNpemUgUElPIG1vZGUgd2lsbCBiZSB1c2VkLiBJbiBQSU8gbW9kZSB3aG9sZSBi dWZmZXIgd2lsbAo+ID4+IGJlIGxvYWRlZCBpbnRvIEZJRk8uCj4gPj4KPiA+PiBJZiBkcml2ZXIg ZmFpbGVkIHRvIHJlcXVlc3QgRE1BIGNoYW5uZWxzIHRoZW4gaXQgZmFsbGJhY2sgZm9yIFBJTyBt b2RlLgo+ID4+Cj4gPj4gVGVzdGVkIG9uIFNPUElORSAoaHR0cHM6Ly93d3cucGluZTY0Lm9yZy9z b3BpbmUvKQo+ID4+Cj4gPj4gU2lnbmVkLW9mZi1ieTogQWxleGFuZGVyIEtvY2hldGtvdiA8YWwu a29jaGV0QGdtYWlsLmNvbT4KPiA+Cj4gPiBUaGFua3MgZm9yIHdvcmtpbmcgb24gdGhpcywgaXQn cyBiZWVuIGEgYml0IG92ZXJkdWUKPgo+IEhpLCBNYXhpbWUhCj4KPiBXZSBkaWQgY3VzdG9tIEE2 NCBiYXNlZCBjb21wdXRhdGlvbiBtb2R1bGUgZm9yIG91ciBwcm9kdWN0Lgo+IERvIHlvdSBtZWFu IHRoYXQgQTY0IGlzIG9ic29sZXRlIG9yIEVPTCBwcm9kdWN0Pwo+IElmIHNvLCBjYW4geW91IHJl Y29tbWVuZCBhY3RpdmUgcmVwbGFjZW1lbnQgZm9yIEE2NCBmcm9tIEFsbHdpbm5lciBzYW1lIHBy aWNlPwoKSSBiZWxpZXZlIHdoYXQgTWF4aW1lIG1lYW50IHdhcyB0aGF0IERNQSB0cmFuc2ZlciBm b3IgU1BJIGlzIGEgbG9uZwpzb3VnaHQtYWZ0ZXIgZmVhdHVyZSwgYnV0IG5vIG9uZSBoYWQgZmlu aXNoZWQgaXQuCgpDaGVuWXUKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxA bGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK