linux-kernel - Re: [PATCH linux-next 01/10] ASoC: rsnd: ssi: Request dedicated dma channels for busif1 to 7

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Date:   Tue, 2 Oct 2018 16:52:24 +0900
From:   Jiada Wang <jiada_wang@...tor.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
CC:     Mark Brown <broonie@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        <dragos_tarcatu@...tor.com>, <twischer@...adit-jv.com>,
        <tiwai@...e.com>, <perex@...ex.cz>
Subject: Re: [PATCH linux-next 01/10] ASoC: rsnd: ssi: Request dedicated dma
 channels for busif1 to 7

Hi Morimoto-san


On 2018/09/28 9:08, Kuninori Morimoto wrote:
> Hi Jiada
> Cc: linux-renesas-soc ML
>
> Thank you for your patch
>
>> From: Jiada Wang <jiada_wang@...tor.com>
>>
>> Currently ssi driver only request dma channel for SSI_0,
>> which is used to transfer data to/from busif0.
>>
>> But since busif1 to busif7 also maybe used, dedicated dma channels
>> are request for data transfer between these busif.
>>
>> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
>> ---
> (snip)
>> @@ -938,12 +940,20 @@ static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
>>   {
>>   	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
>>   	int is_play = rsnd_io_is_play(io);
>> -	char *name;
>> +	int busif = rsnd_ssi_get_busif(io);
>> +	char name[SSI_DMA_NAME_SIZE];
>>   
>> -	if (rsnd_ssi_use_busif(io))
>> -		name = is_play ? "rxu" : "txu";
>> -	else
>> -		name = is_play ? "rx" : "tx";
>> +	if (rsnd_ssi_use_busif(io)) {
>> +		if (is_play)
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "rxu%d", busif);
>> +		else
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "txu%d", busif);
>> +	} else {
>> +		if (is_play)
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "rx");
>> +		else
>> +			snprintf(name, SSI_DMA_NAME_SIZE, "tx");
>> +	}
> Unfortunately, this patch breaks "git bisect", and Gen2 platforms.
> We need to keep existing "rxu/txu" more. Please consider compatibility.
> # we can remove it 2 or 3 version later ?
>
> If the commit which has this patch, but doesn't have [02/xx] or later,
> it can't use BUSIF.
>
> And your patch doesn't care Gen2 series.
> DT compatibility is very sensitive...
Thanks for your review comments, I will send out v2 patch set to take 
care of GEN2 series,
and move this patch after other DT related patches

Thanks,
Jiada