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Commit 2aaad70d authored by Helen Zeng's avatar Helen Zeng
Browse files

usb: gadget: Set software parameters for playback 



Add software parameters setting in playback path to
avoid xrun.

Change-Id: I7727c5f85c26feb3a987866582616524b6d4b885
Signed-off-by: default avatarHelen Zeng <xiaoyunz@codeaurora.org>
parent 5518d1be

drivers/usb/gadget/u_uac1.c

+28 −0
Original line number Diff line number Diff line
@@ -144,6 +144,9 @@ static int playback_prepare_params(struct gaudio_snd_dev *snd) 
{

	struct snd_pcm_substream *substream = snd->substream;

	struct snd_pcm_hw_params *params;

	struct snd_pcm_sw_params *swparams;

	unsigned long period_size;

	unsigned long buffer_size;

	snd_pcm_sframes_t result;



       /*
@@ -194,6 +197,31 @@ static int playback_prepare_params(struct gaudio_snd_dev *snd) 
	snd->channels = params_channels(params);

	snd->rate = params_rate(params);



	/* Set SW params */

	swparams = kzalloc(sizeof(*swparams), GFP_KERNEL);

	if (!swparams) {

		pr_err("Failed to allocate sw params");

		return -ENOMEM;

	}



	buffer_size = pcm_buffer_size(params);

	period_size = pcm_period_size(params);

	swparams->avail_min = period_size/2;

	swparams->xfer_align = period_size/2;



	swparams->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;

	swparams->period_step = 1;

	swparams->start_threshold = 1;

	swparams->stop_threshold = INT_MAX;

	swparams->silence_size = 0;

	swparams->silence_threshold = 0;



	result = snd_pcm_kernel_ioctl(substream,

				      SNDRV_PCM_IOCTL_SW_PARAMS, swparams);

	if (result < 0)

		pr_err("SNDRV_PCM_IOCTL_SW_PARAMS failed: %d\n", (int)result);

	kfree(swparams);



	kfree(params);



	pr_debug("playback params: access %x, format %x, channels %d, rate %d\n",