linux-kernel - Re: [PATCH 08/19] ASoC: amd: ps: add soundwire dma driver dma ops

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Date:   Wed, 11 Jan 2023 19:38:58 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     vkoul@...nel.org, alsa-devel@...a-project.org,
        Basavaraj.Hiregoudar@....com, Sunil-kumar.Dommati@....com,
        Mario.Limonciello@....com, Mastan.Katragadda@....com,
        arungopal.kondaveeti@....com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/19] ASoC: amd: ps: add soundwire dma driver dma ops

On 11/01/23 18:34, Mark Brown wrote:
> On Wed, Jan 11, 2023 at 02:32:11PM +0530, Vijendar Mukunda wrote:
>
>> +static int acp63_sdw_dma_start(struct snd_pcm_substream *stream)
>> +{
>> +	struct sdw_stream_instance *sdw_ins;
>> +	struct snd_soc_pcm_runtime *prtd;
>> +	u32 stream_id;
>> +	u32 sdw_dma_reg;
>> +	u32 sdw_dma_en_stat_reg;
>> +	u32 sdw_dma_stat;
>> +	u32 val;
>> +	int timeout = 0;
>> +
>> +	sdw_ins = stream->runtime->private_data;
>> +	prtd = stream->private_data;
>> +	stream_id = sdw_ins->stream_id;
>> +	switch (stream_id) {
>> +	case ACP_SDW_AUDIO_TX:
>> +		sdw_dma_reg = ACP_SW_AUDIO_TX_EN;
>> +		sdw_dma_en_stat_reg = ACP_SW_AUDIO_TX_EN_STATUS;
>> +		break;
> Not super urgent but if you're respinning then it looks like the
> register selection here is the same in _dma_stop() so they could be
> shared.  Indeed it generally feels like it might be nicer to have a
> table of structs listing the registers needed per stream so all these
> switch statements can be more like
>
> 	sdw_dma_reg = stream_registers[sdw_ins->stream_id];
>
> That'd make each function smaller and I'd expect it'd be a bit easier to
> add new streams for new hardware that way.
will fix it in next version.