linux-kernel - Re: [PATCH 2/6] spi: sun4i: restrict transfer length in PIO-mode

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Message-ID: <20180403081041.3ully6bcyfwx2cx6@flea>
Date:   Tue, 3 Apr 2018 10:10:41 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Sergey Suloev <ssuloev@...altech.com>
Cc:     Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] spi: sun4i: restrict transfer length in PIO-mode

On Thu, Mar 29, 2018 at 09:59:03PM +0300, Sergey Suloev wrote:
> There is no need to handle 3/4 empty/full interrupts as the maximum
> supported transfer length in PIO mode is 64 bytes for sun4i-family
> SoCs.

That assumes that you'll be able to treat the FIFO full interrupt and
drain the FIFO before we have the next byte coming in. This would
require a real time system, and we're not in one of them.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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