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: <20200316115057.GB5010@sirena.org.uk>
Date:   Mon, 16 Mar 2020 11:50:57 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Sasha Levin <sashal@...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 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.

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