linux-kernel - Re: [PATCH v2 1/5] ALSA: soc-compress: add support to snd_compr_set_runtime

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Message-ID: <20181005003112.GG2372@vkoul-mobl>
Date:   Fri, 5 Oct 2018 06:01:12 +0530
From:   Vinod <vkoul@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     broonie@...nel.org, alsa-devel@...a-project.org,
        robh+dt@...nel.org, linux-kernel@...r.kernel.org,
        bgoswami@...eaurora.org, rohitkr@...eaurora.org,
        lgirdwood@...il.com, tiwai@...e.com, devicetree@...r.kernel.org,
        mark.rutland@....com
Subject: Re: [PATCH v2 1/5] ALSA: soc-compress: add support to
 snd_compr_set_runtime_buffer()

On 26-09-18, 11:23, Srinivas Kandagatla wrote:
> This patch adds support to set runtime dma buffer on compressed stream.

The change is fine as is, but I feel we need to document the motivation
in the changelog. The core changes need a bit more explanation on why we
should add this..

> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  include/sound/compress_driver.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
> index ea8c93bbb0e0..0cdc3999ecfa 100644
> --- a/include/sound/compress_driver.h
> +++ b/include/sound/compress_driver.h
> @@ -23,6 +23,7 @@ struct snd_compr_ops;
>   * struct snd_compr_runtime: runtime stream description
>   * @state: stream state
>   * @ops: pointer to DSP callbacks
> + * @dma_buffer_p: runtime dma buffer pointer
>   * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
>   *	DSP doesn't implement copy
>   * @buffer_size: size of the above buffer
> @@ -37,6 +38,7 @@ struct snd_compr_ops;
>  struct snd_compr_runtime {
>  	snd_pcm_state_t state;
>  	struct snd_compr_ops *ops;
> +	struct snd_dma_buffer *dma_buffer_p;
>  	void *buffer;
>  	u64 buffer_size;
>  	u32 fragment_size;
> @@ -175,6 +177,23 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
>  	wake_up(&stream->runtime->sleep);
>  }
>  
> +/**
> + * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
> + * @substream: compress substream to set
> + * @bufp: the buffer information, NULL to clear
> + *
> + * Copy the buffer information to runtime buffer when @bufp is non-NULL.
> + * Otherwise it clears the current buffer information.
> + */
> +static inline void snd_compr_set_runtime_buffer(
> +					struct snd_compr_stream *substream,
> +					struct snd_dma_buffer *bufp)
> +{
> +	struct snd_compr_runtime *runtime = substream->runtime;
> +
> +	runtime->dma_buffer_p = bufp;
> +}
> +
>  int snd_compr_stop_error(struct snd_compr_stream *stream,
>  			 snd_pcm_state_t state);
>  
> -- 
> 2.19.0

-- 
~Vinod