linux-kernel - Re: [PATCH v1 1/1] ASoC: rsnd: ssi: Fix issue in dma data address assignment

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Date:   Fri, 22 Dec 2017 00:43:48 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] ASoC: rsnd: ssi: Fix issue in dma data address assignment

Hi Jiada

Thank you for your feedback
I understand your situation

> We have enabled TDM Split and Ex-Split mode in our kernel,
> and SSI(U)'s dma address diffs based on the BUSIF it is using,
> so have a single dma data struct per rsnd_ssi will cause issue when
> SSI isn't working with BUSIF0.

First of all, "TDM (Ex) Split mode" is not yet supported.
And unfortunately, your patch is not enough for it.
I guess you enabled it with many local patches,
and posted one of them ?

It is very advanced feature, we need to consider about
channel/sampling rate/data width/settings/address etc etc etc...
Lots of things we need to solve/care !
DMA pointer is one of them.

If we focus only to DMA, your patch is still wrong I think.
"Playback/Capture direction" is not related to this topic.
1 DMA on 1 DAI is enough ?
And we need to update rsnd_gen2_dma_addr() too for DMA address.

> Do you have any suggestion to address this issue?

I have no idea at this point.
Missing part for TDM (Ex) Split mode is not only DMA pointer.

Why do you want to use it ?
If you want to do is only "use 2 DAIs for playback",
how about to use MIXer ? It is already supported on upstream.

Best regards
---
Kuninori Morimoto