alsa-lib: fix hw_ptr exceed the boundary

For long time test case, the hw_ptr will exceed the boundary, then cause
the avail size wrong.

(From OE-Core rev: b8d472cb96cf4f6c3077bdb8acf1026d37dac438)

Signed-off-by: Wang Zidan <b50113@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/alsa/alsa-lib/0001-pcm-rate-fix-hw_ptr-exceed-the-boundary.patch b/meta/recipes-multimedia/alsa/alsa-lib/0001-pcm-rate-fix-hw_ptr-exceed-the-boundary.patch
new file mode 100755
index 0000000000..8be3d757a1
--- /dev/null
+++ b/meta/recipes-multimedia/alsa/alsa-lib/0001-pcm-rate-fix-hw_ptr-exceed-the-boundary.patch
@@ -0,0 +1,34 @@
+From 035f196bcdc1e9903ed52ad1859dc23d3aa74e72 Mon Sep 17 00:00:00 2001
+From: Shengjiu Wang <shengjiu.wang@freescale.com>
+Date: Mon, 14 Jul 2014 16:55:48 +0800
+Subject: [PATCH] pcm: rate: fix hw_ptr exceed the boundary
+
+For long time test case, the hw_ptr will exceed the boundary, then cause
+the avail size wrong.
+
+Commit is 035f196bcdc1e9903ed52ad1859dc23d3aa74e72 in master branch
+
+Upstream Status: Backported
+
+Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
+Signed-off-by: Takashi Iwai <tiwai@suse.de>
+---
+ src/pcm/pcm_rate.c |    2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
+index 7f667d4..2563d82 100644
+--- a/src/pcm/pcm_rate.c
++++ b/src/pcm/pcm_rate.c
+@@ -574,6 +574,8 @@ static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
+        rate->hw_ptr =
+                (slave_hw_ptr / rate->gen.slave->period_size) * pcm->period_size +
+                rate->ops.input_frames(rate->obj, slave_hw_ptr % rate->gen.slave->period_size);
++
++       rate->hw_ptr %= pcm->boundary;
+ }
+ 
+ static int snd_pcm_rate_hwsync(snd_pcm_t *pcm)
+-- 
+1.7.9.5
+