linux-kernel - Re: [PATCH v3 04/11] ASoC: jz4740-i2s: Handle independent FIFO flush bits

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Date:   Fri, 08 Jul 2022 16:30:55 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     paul@...pouillou.net, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, linux-mips@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/11] ASoC: jz4740-i2s: Handle independent FIFO
 flush bits


Mark Brown <broonie@...nel.org> writes:

> On Fri, Jul 08, 2022 at 11:42:57AM +0100, Aidan MacDonald wrote:
>> On the JZ4740, there is a single bit that flushes (empties) both
>> the transmit and receive FIFO. Later SoCs have independent flush
>> bits for each FIFO, which allows us to flush the right FIFO when
>> starting up a stream.
>> 
>> This also fixes a bug: since we were only setting the JZ4740's
>> flush bit, which corresponds to the TX FIFO flush bit on other
>> SoCs, other SoCs were not having their RX FIFO flushed at all.
>> 
>> Fixes: 967beb2e8777 ("ASoC: jz4740: Add jz4780 support")
>
> Fixes should generally be at the start of a patch series so they don't
> end up depending on other patches needlessly.

Okay then, I'll refactor it to allow for easier backporting.