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ALSA: pcm: Add a standalone version of snd_pcm_limit_hw_rates

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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@sholland.org>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20200305051143.60691-2-samuel@sholland.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Samuel Holland 2020-03-04 23:11:41 -06:00 committed by Mark Brown
parent 6e02feb0d2
commit 4769bfb9da
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GPG Key ID: 24D68B725D5487D0
2 changed files with 17 additions and 10 deletions
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9
include/sound/pcm.h
View File

@ -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,

18
sound/core/pcm_misc.c
View File

@ -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