From: Troy Kisky <troy.kisky@boundarydevices.com>
Date: Thu, 6 Aug 2009 23:55:32 +0000 (-0700)
Subject: ASoC: DaVinci: pcm, constrain buffer size to multiple of period
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6a90d536feeccb2c84a2831252b1ed4642684da3;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

ASoC: DaVinci: pcm, constrain buffer size to multiple of period

The dma setup code assumes that the buffer size is a multiple
of the period size.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
index 8fd0c3cdc71..ab43a539c11 100644
--- a/sound/soc/davinci/davinci-pcm.c
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -244,6 +244,11 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
 	int ret = 0;
 
 	snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
+	/* ensure that buffer size is a multiple of period size */
+	ret = snd_pcm_hw_constraint_integer(runtime,
+						SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
 
 	prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 	if (prtd == NULL)