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

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Message-ID: <Y76z7uYb2/2BUSfl@sirena.org.uk>
Date:   Wed, 11 Jan 2023 13:04:46 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>
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 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.

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