4 files changed, 13 insertions, 0 deletions

diff --git a/include/sound/asound.h b/include/sound/asound.h
index a1803ecea34d..5d6074faa279 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 dfd9b76b1853..e731f8d71934 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 b75db8e9cc0f..bc57501c584a 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 8bc7cb3db330..f91a439f675c 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;