linux-kernel - Re: [PATCH AUTOSEL for 4.9 002/219] spi/bcm63xx: make spi subsystem aware of message size limits

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Message-ID: <20180305102310.GC8588@sirena.org.uk>
Date:   Mon, 5 Mar 2018 10:23:10 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jonas Gorski <jonas.gorski@...il.com>
Subject: Re: [PATCH AUTOSEL for 4.9 002/219] spi/bcm63xx: make spi subsystem
 aware of message size limits

On Sat, Mar 03, 2018 at 10:27:56PM +0000, Sasha Levin wrote:
> From: Jonas Gorski <jonas.gorski@...il.com>
> 
> [ Upstream commit 0135c03df914f0481c61f097c78d37cece84f330 ]

Why are there so many more patches for v4.9 than for more recent
kernels?

> The bcm63xx SPI controller does not allow manual control of the CS
> lines and will toggle it automatically before and after sending data,
> so we are limited to messages that fit in the FIFO buffer. Since the CS
> lines aren't available as GPIOs either, we will need to make slave
> drivers aware of this limitation so they can handle them accordingly.

This seems really aggressive for stable...

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