linux-kernel - Re: [PATCH V3 4/9] ASoC: amd: ps: add SoundWire dma driver dma ops

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Message-ID: <7d4016a7-871e-91d3-8744-7dc10d809d35@amd.com>
Date:   Wed, 7 Jun 2023 12:34:34 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        broonie@...nel.org
Cc:     alsa-devel@...a-project.org, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mastan.Katragadda@....com,
        Arungopal.kondaveeti@....com, mario.limonciello@....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 V3 4/9] ASoC: amd: ps: add SoundWire dma driver dma ops

On 06/06/23 21:08, Pierre-Louis Bossart wrote:
>> +static int acp63_sdw_dma_start(struct snd_pcm_substream *substream, void __iomem *acp_base)
>> +{
>> +	struct acp_sdw_dma_stream *stream;
>> +	u32 stream_id;
>> +	u32 sdw_dma_en_reg;
>> +	u32 sdw_dma_en_stat_reg;
>> +	u32 sdw_dma_stat;
>> +
>> +	stream = substream->runtime->private_data;
>> +	stream_id = stream->stream_id;
>> +	switch (stream->instance) {
>> +	case ACP_SDW0:
>> +		sdw_dma_en_reg = sdw0_dma_enable_reg[stream_id];
>> +		break;
>> +	case ACP_SDW1:
>> +		sdw_dma_en_reg = sdw1_dma_enable_reg[stream_id];
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +	writel(0x01, acp_base + sdw_dma_en_reg);
>> +	sdw_dma_en_stat_reg = sdw_dma_en_reg + 4;
>> +	return readl_poll_timeout(acp_base + sdw_dma_en_stat_reg, sdw_dma_stat,
>> +				  (sdw_dma_stat & BIT(0)), ACP_DELAY_US, ACP_COUNTER);
>> +}
>> +
>> +static int acp63_sdw_dma_stop(struct snd_pcm_substream *substream, void __iomem *acp_base)
>> +{
>> +	struct acp_sdw_dma_stream *stream;
>> +	u32 stream_id;
>> +	u32 sdw_dma_en_reg;
>> +	u32 sdw_dma_en_stat_reg;
>> +	u32 sdw_dma_stat;
>> +
>> +	stream = substream->runtime->private_data;
>> +	stream_id = stream->stream_id;
>> +	switch (stream->instance) {
>> +	case ACP_SDW0:
>> +		sdw_dma_en_reg = sdw0_dma_enable_reg[stream_id];
>> +		break;
>> +	case ACP_SDW1:
>> +		sdw_dma_en_reg = sdw1_dma_enable_reg[stream_id];
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	writel(0, acp_base + sdw_dma_en_reg);
>> +	sdw_dma_en_stat_reg = sdw_dma_en_reg + 4;
>> +	return readl_poll_timeout(acp_base + sdw_dma_en_stat_reg, sdw_dma_stat, !sdw_dma_stat,
>> +				  ACP_DELAY_US, ACP_COUNTER);
>> +}
> these start/stop routines look mostly the same, except for the value to
> be written in the register. Maybe they can be factored with a common
> helper, e.g. acp63_sdw_dma_enable(true/false).
Yes, it can be refactored. Will fix it.
>> +
>> +static int acp63_sdw_dma_trigger(struct snd_soc_component *comp,
>> +				 struct snd_pcm_substream *substream,
>> +				 int cmd)
>> +{
>> +	struct sdw_dma_dev_data *sdw_data;
>> +	int ret;
>> +
>> +	sdw_data = dev_get_drvdata(comp->dev);
>> +	switch (cmd) {
>> +	case SNDRV_PCM_TRIGGER_START:
>> +	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
>> +	case SNDRV_PCM_TRIGGER_RESUME:
>> +		ret = acp63_sdw_dma_start(substream, sdw_data->acp_base);
>> +		break;
>> +	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> +	case SNDRV_PCM_TRIGGER_SUSPEND:
>> +	case SNDRV_PCM_TRIGGER_STOP:
>> +		ret = acp63_sdw_dma_stop(substream, sdw_data->acp_base);
>> +		break;
>> +	default:
>> +		ret = -EINVAL;
>> +	}
>> +	if (ret)
>> +		dev_err(comp->dev, "trigger %d failed: %d", cmd, ret);
>> +	return ret;
>> +}