Unverified Commit 5e7820e3 authored by Brent Lu's avatar Brent Lu Committed by Mark Brown
Browse files

ASoC: intel: atom: Add period size constraint 



Use constraint to make sure the period size could always be multiple
of 1ms to align with the fundamental design/limitation of firmware.

Signed-off-by: default avatarBrent Lu <brent.lu@intel.com>
Link: https://lore.kernel.org/r/1596198365-10105-2-git-send-email-brent.lu@intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 5610921a

sound/soc/intel/atom/sst-mfld-platform-pcm.c

+11 −0
Original line number Diff line number Diff line
@@ -333,6 +333,17 @@ static int sst_media_open(struct snd_pcm_substream *substream, 
	if (ret_val < 0)

		goto out_power_up;



	/*

	 * Make sure the period to be multiple of 1ms to align the

	 * design of firmware. Apply same rule to buffer size to make

	 * sure alsa could always find a value for period size

	 * regardless the buffer size given by user space.

	 */

	snd_pcm_hw_constraint_step(substream->runtime, 0,

			   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 48);

	snd_pcm_hw_constraint_step(substream->runtime, 0,

			   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 48);



	/* Make sure, that the period size is always even */

	snd_pcm_hw_constraint_step(substream->runtime, 0,

			   SNDRV_PCM_HW_PARAM_PERIODS, 2);