linux-kernel - Re: [PATCH v3 3/6] spi: sun6i: restrict transfer length in PIO-mode

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Message-ID: <20180405131735.GB12349@sirena.org.uk>
Date:   Thu, 5 Apr 2018 14:17:35 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sergey Suloev <ssuloev@...altech.com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v3 3/6] spi: sun6i: restrict transfer length in PIO-mode

On Thu, Apr 05, 2018 at 12:59:35PM +0300, Sergey Suloev wrote:
> On 04/05/2018 12:19 PM, Maxime Ripard wrote:

> > The point of that patch was precisely to allow to send more data than
> > the FIFO. You're breaking that behaviour without any justification,
> > and this is not ok.

> I am sorry, but you can't. That's a hardware limitation.

Are you positive about that?  Normally you can add things to hardware
FIFOs while they're being drained so so long as you can keep data
flowing in at least as fast as it's being consumed.

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