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-rw-r--r--include/sound/asound.h3
-rw-r--r--include/sound/pcm.h1
-rw-r--r--sound/core/pcm_lib.c6
-rw-r--r--sound/core/pcm_native.c3
4 files changed, 13 insertions, 0 deletions
diff --git a/include/sound/asound.h b/include/sound/asound.h
index a1803ec..5d6074f 100644
--- a/include/sound/asound.h
+++ b/include/sound/asound.h
@@ -259,6 +259,7 @@ typedef int __bitwise snd_pcm_subformat_t;
#define SNDRV_PCM_INFO_HALF_DUPLEX 0x00100000 /* only half duplex */
#define SNDRV_PCM_INFO_JOINT_DUPLEX 0x00200000 /* playback and capture stream are somewhat correlated */
#define SNDRV_PCM_INFO_SYNC_START 0x00400000 /* pcm support some kind of sync go */
+#define SNDRV_PCM_INFO_NO_PERIOD_WAKEUP 0x00800000 /* period wakeup can be disabled */
#define SNDRV_PCM_INFO_FIFO_IN_FRAMES 0x80000000 /* internal kernel flag - FIFO size is in frames */
typedef int __bitwise snd_pcm_state_t;
@@ -334,6 +335,8 @@ typedef int snd_pcm_hw_param_t;
#define SNDRV_PCM_HW_PARAM_LAST_INTERVAL SNDRV_PCM_HW_PARAM_TICK_TIME
#define SNDRV_PCM_HW_PARAMS_NORESAMPLE (1<<0) /* avoid rate resampling */
+#define SNDRV_PCM_HW_PARAMS_EXPORT_BUFFER (1<<1) /* export buffer */
+#define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2) /* disable period wakeups */
struct snd_interval {
unsigned int min, max;
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index dfd9b76..e731f8d7 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -297,6 +297,7 @@ struct snd_pcm_runtime {
unsigned int info;
unsigned int rate_num;
unsigned int rate_den;
+ unsigned int no_period_wakeup: 1;
/* -- SW params -- */
int tstamp_mode; /* mmap timestamp is updated */
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index b75db8e..bc57501 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -373,6 +373,11 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
(unsigned long)new_hw_ptr,
(unsigned long)runtime->hw_ptr_base);
}
+
+ /* without period interrupts, there are no regular pointer updates */
+ if (runtime->no_period_wakeup)
+ goto no_delta_check;
+
/* something must be really wrong */
if (delta >= runtime->buffer_size + runtime->period_size) {
hw_ptr_error(substream,
@@ -442,6 +447,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
(long)old_hw_ptr);
}
+ no_delta_check:
if (runtime->status->hw_ptr == new_hw_ptr)
return 0;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 8bc7cb3..f91a439 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -423,6 +423,9 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
+ runtime->no_period_wakeup =
+ (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
+ (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
bits = snd_pcm_format_physical_width(runtime->format);
runtime->sample_bits = bits;
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