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ASoC: ti: davinci-mcasp: Set min period size using FIFO config

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The minimum period size was enforced to 64 as older devices integrating
McASP with EDMA used an internal FIFO of 64 samples.

With UDMA based platforms this internal McASP FIFO is optional, as the
DMA engine internally does some buffering which is already accounted for
when registering the platform. So we should read the actual FIFO
configuration (txnumevt/rxnumevt) instead of hardcoding frames.min to
64.

Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20240611-asoc_next-v3-2-fcfd84b12164@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jai Luthra 2024-06-11 18:02:56 +05:30 committed by Mark Brown
parent e8343410dd
commit c5dcf8ab10
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GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 2 deletions
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9
sound/soc/ti/davinci-mcasp.c
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@ -1472,10 +1472,11 @@ static int davinci_mcasp_hw_rule_min_periodsize(
{
struct snd_interval *period_size = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
u8 numevt = *((u8 *)rule->private);
struct snd_interval frames;
snd_interval_any(&frames);
frames.min = 64;
frames.min = numevt;
frames.integer = 1;
return snd_interval_refine(period_size, &frames);
@ -1490,6 +1491,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
u32 max_channels = 0;
int i, dir, ret;
int tdm_slots = mcasp->tdm_slots;
u8 *numevt;
/* Do not allow more then one stream per direction */
if (mcasp->substreams[substream->stream])
@ -1589,9 +1591,12 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
return ret;
}
numevt = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
&mcasp->txnumevt :
&mcasp->rxnumevt;
snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
davinci_mcasp_hw_rule_min_periodsize, NULL,
davinci_mcasp_hw_rule_min_periodsize, numevt,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
return 0;