linux-kernel - Re: [PATCH linux-next v2 8/9] ASoC: rsnd: ssi: Request dedicated dma channels for busif0 to 7

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Date:   Thu, 4 Oct 2018 12:00:29 +0900
From:   Jiada Wang <jiada_wang@...tor.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.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 linux-next v2 8/9] ASoC: rsnd: ssi: Request dedicated dma
 channels for busif0 to 7

Hi Morimoto-san


On 2018/10/04 10:12, Kuninori Morimoto wrote:
> Hi Jiada
>
> Thank you for your patch
>
>> Currently ssi driver only request dma channel for SSI_0,
>> which is used to transfer data to/from busif0.
>>
>> But in GEN3 busif1 to busif7 also maybe used, dedicated dma channels
>> are requested for data transfer through these busif.
>>
>> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
>> ---
> (snip)
>> +	if (rsnd_ssi_use_busif(io)) {
>> +		if (is_play)
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "rxu");
>> +		else
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "txu");
>> +
>> +		if (rsnd_is_gen3(priv)) {
>> +			/*
>> +			 * Gen3 supports to use all available BUSIF
>> +			 */
>> +			int busif = rsnd_ssi_get_busif(io);
>> +
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "%s%d", name, busif);
>> +		}
> I think unspecified GenX is better idea.
> For example, we might want to have same setting on Gen2 in the future.
> (and this is not Gen3 HW specific feature
>   But yes, we have SW side reason)
>
> How about like this ?
> We can keep compatibility, and both Gen2/Gen3 can use it.
>
> 	if (rsnd_ssi_use_busif(io)) {
> 		/*
> 		 * 1) try to find txu%d/rxu%d first
> 		 * 2) If can't find it, try to find old txu/rxu
> 		 */
> 	}
I think this is a good idea, by doing so,
in case GEN2 DT also starts to support different BUSIF,
then no driver side change is required.

I will update accordingly in next version

Thanks,
Jiada