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: <20180305200744.afw64js6wnmyfqrb@sasha-lappy>
Date:   Mon, 5 Mar 2018 20:07:46 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Mark Brown <broonie@...nel.org>
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 Mon, Mar 05, 2018 at 10:23:10AM +0000, Mark Brown wrote:
>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 v4.11..v4.14 range got processed, and all those commits are now
being pushed into 4.9 and older.

>> 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...

Why so?

-- 

Thanks,
Sasha