linux-kernel - Re: [PATCH linux-next 1/1] ASoC: rsnd: ssiu: reset SSI

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Date:   Mon, 30 Oct 2017 17:08:32 +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>, <gustavo@...eddedor.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH linux-next 1/1] ASoC: rsnd: ssiu: reset SSI_MODE register

Hello Morimoto-san


On 10/30/2017 08:38 AM, Kuninori Morimoto wrote:
>
> Hi Jiada
>
>> register SSI_MODE is set when SSI works in TDM Extended or
>> TDM (Ex-)Split mode, but it isn't reset after SSI stops.
>> this will cause issue, if SSI starts to work in other modes
>> which requie SSI_MODE to have different value.
>>
>> This patch resets SSI_MODE register in .stop callback,
>> when last stream calls .stop.
>>
>> Fixes: 186fadc132f0 ("ASoC: rsnd: add TDM Extend Mode support")
>> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
>> ---
>>  sound/soc/sh/rcar/ssiu.c |    2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/sound/soc/sh/rcar/ssiu.c b/sound/soc/sh/rcar/ssiu.c
>> index 4d94875..eff9f3b 100644
>> --- a/sound/soc/sh/rcar/ssiu.c
>> +++ b/sound/soc/sh/rcar/ssiu.c
>> @@ -217,6 +217,8 @@ static int rsnd_ssiu_stop_gen2(struct rsnd_mod *mod,
>>  	if (rsnd_ssi_multi_slaves_runtime(io))
>>  		rsnd_mod_write(mod, SSI_CONTROL, 0);
>>
>> +	rsnd_mod_write(mod, SSI_MODE, 0);
>> +
>>  	return 0;
>>  }
>
> Thank you for your patch.
> But, I don't want to reset register when stop, because
> it might be point-less if SoC has power domain.
> How about this or similar (not tested) ?
>
> ------------------
> diff --git a/sound/soc/sh/rcar/ssiu.c b/sound/soc/sh/rcar/ssiu.c
> index 4d94875..8dc2e92 100644
> --- a/sound/soc/sh/rcar/ssiu.c
> +++ b/sound/soc/sh/rcar/ssiu.c
> @@ -130,14 +130,13 @@ static int rsnd_ssiu_init_gen2(struct rsnd_mod *mod,
>  	if (ret < 0)
>  		return ret;
>
> -	if (rsnd_runtime_is_ssi_tdm(io)) {
> -		/*
> -		 * TDM Extend Mode
> -		 * see
> -		 *	rsnd_ssi_config_init()
> -		 */
> -		rsnd_mod_write(mod, SSI_MODE, 0x1);
> -	}
> +	/*
> +	 * TDM Extend Mode
> +	 * see
> +	 *	rsnd_ssi_config_init()
> +	 */
> +	rsnd_mod_write(mod, SSI_MODE,
> +		       rsnd_runtime_is_ssi_tdm(io) ? 0x1 : 0x0);

Thanks for your suggestion,
I will do some test for this change,
if it works fine, I will submit ver2 with it

Thanks,
Jiada
>
>  	if (rsnd_ssi_use_busif(io)) {
>  		rsnd_mod_write(mod, SSI_BUSIF_ADINR,
>
>
> Best regards
> ---
> Kuninori Morimoto
>