linux-kernel - Re: [PATCH v4 1/3] ALSA: pcm: Add a standalone version of snd_pcm_limit_hw

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Date:   Thu, 05 Mar 2020 15:53:56 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Jerome Brunet <jbrunet@...libre.com>,
        Ondrej Jirman <megous@...ous.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 1/3] ALSA: pcm: Add a standalone version of snd_pcm_limit_hw_rates

On Thu, 05 Mar 2020 06:11:41 +0100,
Samuel Holland wrote:
> 
> It can be useful to derive min/max rates of a snd_pcm_hardware without
> having a snd_pcm_runtime, such as before constructing an ASoC DAI link.
> 
> Create a new helper that takes a pointer to a snd_pcm_hardware directly,
> and refactor the original function as a wrapper around it, to avoid
> needing to update any call sites.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

The code change looks OK to me.

Reviewed-by: Takashi Iwai <tiwai@...e.de>


thanks,

Takashi


> ---
>  include/sound/pcm.h   |  9 ++++++++-
>  sound/core/pcm_misc.c | 18 +++++++++---------
>  2 files changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/include/sound/pcm.h b/include/sound/pcm.h
> index 2628246b76fa..f7a95b711100 100644
> --- a/include/sound/pcm.h
> +++ b/include/sound/pcm.h
> @@ -1127,7 +1127,14 @@ snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
>  	return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
>  }
>  
> -int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
> +int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
> +
> +static inline int
> +snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
> +{
> +	return snd_pcm_hw_limit_rates(&runtime->hw);
> +}
> +
>  unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
>  unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
>  unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
> diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c
> index a6a541511534..5dd2e5335900 100644
> --- a/sound/core/pcm_misc.c
> +++ b/sound/core/pcm_misc.c
> @@ -474,32 +474,32 @@ int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int
>  EXPORT_SYMBOL(snd_pcm_format_set_silence);
>  
>  /**
> - * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
> - * @runtime: the runtime instance
> + * snd_pcm_hw_limit_rates - determine rate_min/rate_max fields
> + * @hw: the pcm hw instance
>   *
>   * Determines the rate_min and rate_max fields from the rates bits of
> - * the given runtime->hw.
> + * the given hw.
>   *
>   * Return: Zero if successful.
>   */
> -int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
> +int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw)
>  {
>  	int i;
>  	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
> -		if (runtime->hw.rates & (1 << i)) {
> -			runtime->hw.rate_min = snd_pcm_known_rates.list[i];
> +		if (hw->rates & (1 << i)) {
> +			hw->rate_min = snd_pcm_known_rates.list[i];
>  			break;
>  		}
>  	}
>  	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
> -		if (runtime->hw.rates & (1 << i)) {
> -			runtime->hw.rate_max = snd_pcm_known_rates.list[i];
> +		if (hw->rates & (1 << i)) {
> +			hw->rate_max = snd_pcm_known_rates.list[i];
>  			break;
>  		}
>  	}
>  	return 0;
>  }
> -EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
> +EXPORT_SYMBOL(snd_pcm_hw_limit_rates);
>  
>  /**
>   * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
> -- 
> 2.24.1
>