>From 1558c960aa92d107a0fdb1db8d825be7fdccad79 Mon Sep 17 00:00:00 2001
From: Feng Tang <feng.t...@intel.com>
Date: Fri, 29 Jul 2011 15:01:47 +0800
Subject: [PATCH 2/2] sst: add support for disabling periodic HW irq
Disabling period audio IRQ will greatly reduce the wakeup from Audio
subsystem. And also it will help to solve the playback/capture
latency issue for instant IM APPs like skype.
Signed-off-by: Feng Tang <feng.t...@intel.com>
---
drivers/staging/intel_sst/intel_sst_ioctl.h | 1 +
drivers/staging/intel_sst/intelmid.c | 3 ++-
drivers/staging/intel_sst/intelmid_pvt.c | 24 ++++++++++++++----------
3 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/intel_sst/intel_sst_ioctl.h
b/drivers/staging/intel_sst/intel_sst_ioctl.h
index dec99df..e22175f 100644
--- a/drivers/staging/intel_sst/intel_sst_ioctl.h
+++ b/drivers/staging/intel_sst/intel_sst_ioctl.h
@@ -123,6 +123,7 @@ struct snd_pcm_params {
__u32 ring_buffer_size;
__u32 period_count; /* period elapsed in samples*/
__u32 ring_buffer_addr;
+ __u32 no_irq;
};
/* MP3 Music Parameters Message */
diff --git a/drivers/staging/intel_sst/intelmid.c
b/drivers/staging/intel_sst/intelmid.c
index 9088256..ee9fdb3 100644
--- a/drivers/staging/intel_sst/intelmid.c
+++ b/drivers/staging/intel_sst/intelmid.c
@@ -79,7 +79,8 @@ static struct snd_pcm_hardware snd_intelmad_stream = {
SNDRV_PCM_INFO_MMAP|
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
- SNDRV_PCM_INFO_SYNC_START),
+ SNDRV_PCM_INFO_SYNC_START |
+ SNDRV_PCM_INFO_NO_PERIOD_WAKEUP),
.formats = (SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_U16 |
SNDRV_PCM_FMTBIT_S24 | SNDRV_PCM_FMTBIT_U24 |
SNDRV_PCM_FMTBIT_S32 | SNDRV_PCM_FMTBIT_U32),
diff --git a/drivers/staging/intel_sst/intelmid_pvt.c
b/drivers/staging/intel_sst/intelmid_pvt.c
index 387eeb8..d93a879 100644
--- a/drivers/staging/intel_sst/intelmid_pvt.c
+++ b/drivers/staging/intel_sst/intelmid_pvt.c
@@ -58,26 +58,30 @@ void period_elapsed(void *mad_substream)
int snd_intelmad_alloc_stream(struct snd_pcm_substream *substream)
{
struct snd_intelmad *intelmaddata = snd_pcm_substream_chip(substream);
- struct mad_stream_pvt *stream = substream->runtime->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct mad_stream_pvt *stream = runtime->private_data;
struct snd_sst_stream_params param = {{{0,},},};
struct snd_sst_params str_params = {0};
int ret_val;
/* set codec params and inform SST driver the same */
-
param.uc.pcm_params.codec = SST_CODEC_TYPE_PCM;
- param.uc.pcm_params.num_chan = (u8) substream->runtime->channels;
- param.uc.pcm_params.pcm_wd_sz = substream->runtime->sample_bits;
+ param.uc.pcm_params.num_chan = (u8) runtime->channels;
+ param.uc.pcm_params.pcm_wd_sz = runtime->sample_bits;
param.uc.pcm_params.reserved = 0;
- param.uc.pcm_params.sfreq = substream->runtime->rate;
+ param.uc.pcm_params.sfreq = runtime->rate;
param.uc.pcm_params.ring_buffer_size =
snd_pcm_lib_buffer_bytes(substream);
- param.uc.pcm_params.period_count = substream->runtime->period_size;
+ param.uc.pcm_params.period_count = runtime->period_size;
param.uc.pcm_params.ring_buffer_addr =
- virt_to_phys(substream->runtime->dma_area);
- pr_debug("sst: period_cnt = %d\n", param.uc.pcm_params.period_count);
- pr_debug("sst: sfreq= %d, wd_sz = %d\n",
- param.uc.pcm_params.sfreq, param.uc.pcm_params.pcm_wd_sz);
+ virt_to_phys(runtime->dma_area);
+ param.uc.pcm_params.no_irq = runtime->no_period_wakeup;
+ pr_debug("sst: hw_param: period_cnt=%d sfreq=%d wd_sz=%d chan=%d
no_irq=%d\n",
+ param.uc.pcm_params.period_count,
+ param.uc.pcm_params.sfreq,
+ param.uc.pcm_params.pcm_wd_sz,
+ param.uc.pcm_params.num_chan,
+ param.uc.pcm_params.no_irq);
str_params.sparams = param;
str_params.codec = SST_CODEC_TYPE_PCM;
--
1.7.1
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