linux-kernel - Re: [PATCH 04/11] ASoC: amd: removed separate byte count variables for playback and capture

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Date:   Sun, 29 Apr 2018 21:41:33 +0000
From:   Daniel Kurtz <djkurtz@...omium.org>
To:     Vijendar.Mukunda@....com
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, perex@...ex.cz,
        tiwai@...e.com, alexander.deucher@....com, jclinton@...omium.org,
        Akshu Agrawal <akshu.agrawal@....com>,
        Guenter Roeck <linux@...ck-us.net>, pombredanne@...b.com,
        kstewart@...uxfoundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] ASoC: amd: removed separate byte count variables
 for playback and capture

Hi Vijendar,

On Thu, Apr 26, 2018 at 5:15 AM Vijendar Mukunda <Vijendar.Mukunda@....com>
wrote:

> Removed separate byte count variables for playback and capture.

> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>

Reviewed-by: Daniel Kurtz <djkurtz@...omium.org>

> ---
>   sound/soc/amd/acp-pcm-dma.c | 19 +++++--------------
>   sound/soc/amd/acp.h         |  3 +--
>   2 files changed, 6 insertions(+), 16 deletions(-)

> diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
> index 019f696..5f34be1 100644
> --- a/sound/soc/amd/acp-pcm-dma.c
> +++ b/sound/soc/amd/acp-pcm-dma.c
> @@ -866,13 +866,8 @@ static snd_pcm_uframes_t acp_dma_pointer(struct
snd_pcm_substream *substream)
>          buffersize = frames_to_bytes(runtime, runtime->buffer_size);
>          bytescount = acp_get_byte_count(rtd);

> -       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> -               if (bytescount > rtd->i2ssp_renderbytescount)
> -                       bytescount = bytescount -
rtd->i2ssp_renderbytescount;
> -       } else {
> -               if (bytescount > rtd->i2ssp_capturebytescount)
> -                       bytescount = bytescount -
rtd->i2ssp_capturebytescount;
> -       }
> +       if (bytescount > rtd->bytescount)
> +               bytescount = bytescount - rtd->bytescount;

nit, this could be:
bytescount -= rtd->bytescount;

>          pos = do_div(bytescount, buffersize);
>          return bytes_to_frames(runtime, pos);
>   }
> @@ -921,9 +916,9 @@ static int acp_dma_trigger(struct snd_pcm_substream
*substream, int cmd)
>          case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
>          case SNDRV_PCM_TRIGGER_RESUME:
>                  bytescount = acp_get_byte_count(rtd);
> +               if (rtd->bytescount == 0)
> +                       rtd->bytescount = bytescount;
>                  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> -                       if (rtd->i2ssp_renderbytescount == 0)
> -                               rtd->i2ssp_renderbytescount = bytescount;
>                          acp_dma_start(rtd->acp_mmio, rtd->ch1, false);
>                          while (acp_reg_read(rtd->acp_mmio,
mmACP_DMA_CH_STS) &
>                                  BIT(rtd->ch1)) {
> @@ -934,9 +929,6 @@ static int acp_dma_trigger(struct snd_pcm_substream
*substream, int cmd)
>                                  }
>                                  cpu_relax();
>                          }
> -               } else {
> -                       if (rtd->i2ssp_capturebytescount == 0)
> -                               rtd->i2ssp_capturebytescount = bytescount;
>                  }
>                  acp_dma_start(rtd->acp_mmio, rtd->ch2, true);
>                  ret = 0;
> @@ -947,12 +939,11 @@ static int acp_dma_trigger(struct snd_pcm_substream
*substream, int cmd)
>                  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
>                          acp_dma_stop(rtd->acp_mmio, rtd->ch1);
>                          ret =  acp_dma_stop(rtd->acp_mmio, rtd->ch2);
> -                       rtd->i2ssp_renderbytescount = 0;
>                  } else {
>                          acp_dma_stop(rtd->acp_mmio, rtd->ch2);
>                          ret = acp_dma_stop(rtd->acp_mmio, rtd->ch1);
> -                       rtd->i2ssp_capturebytescount = 0;
>                  }
> +               rtd->bytescount = 0;
>                  break;
>          default:
>                  ret = -EINVAL;
> diff --git a/sound/soc/amd/acp.h b/sound/soc/amd/acp.h
> index 3b076c6..82470bc 100644
> --- a/sound/soc/amd/acp.h
> +++ b/sound/soc/amd/acp.h
> @@ -93,8 +93,7 @@ struct audio_substream_data {
>          u32 byte_cnt_high_reg_offset;
>          u32 byte_cnt_low_reg_offset;
>          uint64_t size;
> -       u64 i2ssp_renderbytescount;
> -       u64 i2ssp_capturebytescount;
> +       u64 bytescount;
>          void __iomem *acp_mmio;
>   };

> --
> 2.7.4