linux-kernel - Re: [PATCH v2 4/6] dmaengine: dw: Print warning if multi-block is unsupported

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Message-ID: <20200511174800.GM8216@sirena.org.uk>
Date:   Mon, 11 May 2020 18:48:00 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vinod Koul <vkoul@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        dmaengine <dmaengine@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/6] dmaengine: dw: Print warning if multi-block is
 unsupported

On Mon, May 11, 2020 at 04:58:53PM +0300, Andy Shevchenko wrote:
> On Mon, May 11, 2020 at 4:48 PM Serge Semin

> > So the question is of how to export the multi-block LLP flag from DW DMAc
> > driver. Andy?

> I'm not sure I understand why do you need this being exported. Just
> always supply SG list out of single entry and define the length
> according to the maximum segment size (it's done IIRC in SPI core).

If there's a limit from the dmaengine it'd be a bit cleaner to export
the limit from the DMA engine (and it'd help with code reuse for clients
that might work with other DMA controllers without needing to add custom
compatibles for those instantiations).

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