linux-kernel - Re: [PATCH 14/17] spi: dw: Add DMA support to the DW SPI MMIO driver

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Message-ID: <20200508192317.GU185537@smile.fi.intel.com>
Date:   Fri, 8 May 2020 22:23:17 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Georgy Vlasov <Georgy.Vlasov@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        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>,
        Allison Randal <allison@...utok.net>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, John Garry <john.garry@...wei.com>,
        Chuanhong Guo <gch981213@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Tomer Maimon <tmaimon77@...il.com>,
        Masahisa Kojima <masahisa.kojima@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <swboyd@...omium.org>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "wuxu.wu" <wuxu.wu@...wei.com>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/17] spi: dw: Add DMA support to the DW SPI MMIO driver

On Fri, May 08, 2020 at 04:29:39PM +0300, Serge Semin wrote:
> Since the common code in the spi-dw-dma.c driver is ready to be used
> by the MMIO driver, we just need to initialize the DW SPI private data
> fields with Tx/Rx DMA channel handlers and setup the DW SPI DMA
> callbacks. This commit introduces such alterations to the DW SPI
> DMA/MMIO code. A dedicated DW SPI MMIO DMA initializer performs the
> DMA channels request from the parental device (which is supposed to be
> a DW SPI platform device). Then it checks whether the retrieved DW DMA
> channels support LLP. If they don't currently we print a warning, that
> further DMA usage may be finished with DW SPI inbound FIFO overflow
> (nothing else we can do about it at the moment). Finally the DW SPI
> MMIO DMA initializer sets the DMA-inited flag.
> 
> Currently the DMA will be initialized only for a generic DW SPI MMIO
> device declared with "snps,dw-apb-ssi" compatible string if SPI_DW_DMA
> kernel config is enabled.

Already in spi/for-next (see for generic suffix in spi-dw-mid.c).

-- 
With Best Regards,
Andy Shevchenko