linux-kernel - Re: [PATCH AUTOSEL 5.5 01/41] spi: spi-omap2-mcspi: Handle DMA size restriction on AM65x

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Message-ID: <20200322193739.GO4189@sasha-vm>
Date:   Sun, 22 Mar 2020 15:37:39 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.5 01/41] spi: spi-omap2-mcspi: Handle DMA size
 restriction on AM65x

On Mon, Mar 16, 2020 at 11:50:57AM +0000, Mark Brown wrote:
>On Sun, Mar 15, 2020 at 10:32:39PM -0400, Sasha Levin wrote:
>> From: Vignesh Raghavendra <vigneshr@...com>
>>
>> [ Upstream commit e4e8276a4f652be2c7bb783a0155d4adb85f5d7d ]
>>
>> On AM654, McSPI can only support 4K - 1 bytes per transfer when DMA is
>> enabled. Therefore populate master->max_transfer_size callback to
>> inform client drivers of this restriction when DMA channels are
>> available.
>
>As ever this only provides information to other drivers which may be
>buggy.

I'll drop it, thanks!

-- 
Thanks,
Sasha