linux-kernel - Re: [PATCH] spi: omap2-mcspi: Revert FIFO support without DMA

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Message-ID: <c398a28b-8fca-483c-ae1d-588c2c081190@sirena.org.uk>
Date: Mon, 12 Feb 2024 12:59:27 +0000
From: Mark Brown <broonie@...nel.org>
To: Vaishnav Achath <vaishnav.a@...com>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	vigneshr@...com, u-kumar1@...com
Subject: Re: [PATCH] spi: omap2-mcspi: Revert FIFO support without DMA

On Mon, Feb 12, 2024 at 05:30:49PM +0530, Vaishnav Achath wrote:
> MCSPI controller have few limitations regarding the transaction
> size when the FIFO buffer is enabled and the WCNT feature is used
> to find the end of word, in this case if WCNT is not a multiple of
> the FIFO Almost Empty Level (AEL), then the FIFO empty event is not
> generated correctly. In addition to this limitation, few other unknown
> sequence of events that causes the FIFO empty status to not reflect the
> exact status were found when FIFO is being used without DMA enabled
> during extended testing in AM65x platform. Till the exact root cause
> is found and fixed, revert the FIFO support without DMA.
> 
> See J721E Technical Reference Manual (SPRUI1C), section 12.1.5
> for further details: http://www.ti.com/lit/pdf/spruil1
> 
> This reverts commit 75223bbea840e125359fc63942b5f93462b474c6.

Please include human readable descriptions of things like commits and
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easier for humans to read especially when they have no internet access.
I do frequently catch up on my mail on flights or while otherwise
travelling so this is even more pressing for me than just being about
making things a bit easier to read.

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