linux-kernel - Re: [PATCH v2 02/19] spi: dw: Add Tx/Rx finish wait methods to the MID DMA

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Message-ID: <20200515123702.GA185537@smile.fi.intel.com>
Date:   Fri, 15 May 2020 15:37:02 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        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,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "wuxu.wu" <wuxu.wu@...wei.com>, Clement Leger <cleger@...ray.eu>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/19] spi: dw: Add Tx/Rx finish wait methods to the
 MID DMA

On Fri, May 15, 2020 at 01:18:15PM +0100, Mark Brown wrote:
> On Fri, May 15, 2020 at 03:01:11PM +0300, Andy Shevchenko wrote:
> 
> > General question, doesn't spi core provides us some helpers like
> > spi_delay_exec()?
> 
> Well, nobody wrote one.

spi_delay_exec() seems quite good to be used here.
Can we use it for delays?

> It's also a bit tricky to handle given that
> often you're checking some controller specific things while a FIFO in
> the IP drains/fills, though nothing insurmountable.

Yes, input can be gathered by reading controller specific data.

-- 
With Best Regards,
Andy Shevchenko