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Message-ID: <c24b2f1c-3b08-492f-954c-c4f10ae5ad81@sirena.org.uk>
Date: Wed, 24 May 2023 10:48:40 +0100
From: Mark Brown <broonie@...nel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: perex@...ex.cz, tiwai@...e.com, lgirdwood@...il.com,
ckeepax@...nsource.cirrus.com, kuninori.morimoto.gx@...esas.com,
linux-kernel@...r.kernel.org, pierre-louis.bossart@...ux.intel.com,
alsa-devel@...a-project.org
Subject: Re: [PATCH 1/2] ASoC: codecs: wsa883x: do not set can_multi_write
flag
On Wed, May 24, 2023 at 10:42:21AM +0100, Srinivas Kandagatla wrote:
> On 24/05/2023 09:57, Mark Brown wrote:
> > I'm unclear, is this a limitation of the hardware or of the current
> > Soundwire code?
> Its both.
> Codec itself does not have any private write callback to support this and
> AFAIU Qualcomm Soundwire controller does not have any such hw facility to
> program multi-registers for device at one shot.
How about the *CODEC* hardware?
> Is write callback used for both Bulk writes and multi-writes?
Only multi-write at this point but we probably should consider redoing
bulk writes to use it as well.
> Is multi-write feature of regmap bus or device?
Well, I don't think any buses that understand registers have implemented
it yet but there's nothing fundamental that means that a bus couldn't
usefully do something with multi-write. The current users all use raw
buses that don't know anything about registers or values.
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