diff options
| -rw-r--r-- | sound/soc/imx/imx-pcm-fiq.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/sound/soc/imx/imx-pcm-fiq.c b/sound/soc/imx/imx-pcm-fiq.c index a1c4ce6..d9cb984 100644 --- a/sound/soc/imx/imx-pcm-fiq.c +++ b/sound/soc/imx/imx-pcm-fiq.c @@ -36,17 +36,24 @@ struct imx_pcm_runtime_data { int period; int periods; unsigned long offset; + unsigned long last_offset; unsigned long size; struct timer_list timer; - int period_time; + int poll_time; }; +static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd) +{ + iprtd->timer.expires = jiffies + iprtd->poll_time; +} + static void imx_ssi_timer_callback(unsigned long data) { struct snd_pcm_substream *substream = (void *)data; struct snd_pcm_runtime *runtime = substream->runtime; struct imx_pcm_runtime_data *iprtd = runtime->private_data; struct pt_regs regs; + unsigned long delta; get_fiq_regs(®s); @@ -55,9 +62,25 @@ static void imx_ssi_timer_callback(unsigned long data) else iprtd->offset = regs.ARM_r9 & 0xffff; - iprtd->timer.expires = jiffies + iprtd->period_time; + /* How much data have we transferred since the last period report? */ + if (iprtd->offset >= iprtd->last_offset) + delta = iprtd->offset - iprtd->last_offset; + else + delta = runtime->buffer_size + iprtd->offset + - iprtd->last_offset; + + /* If we've transferred at least a period then report it and + * reset our poll time */ + if (delta >= runtime->period_size) { + snd_pcm_period_elapsed(substream); + iprtd->last_offset = iprtd->offset; + + imx_ssi_set_next_poll(iprtd); + } + + /* Restart the timer; if we didn't report we'll run on the next tick */ add_timer(&iprtd->timer); - snd_pcm_period_elapsed(substream); + } static struct fiq_handler fh = { @@ -72,9 +95,10 @@ static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, iprtd->size = params_buffer_bytes(params); iprtd->periods = params_periods(params); - iprtd->period = params_period_bytes(params); + iprtd->period = params_period_bytes(params) ; iprtd->offset = 0; - iprtd->period_time = HZ / (params_rate(params) / params_period_size(params)); + iprtd->last_offset = 0; + iprtd->poll_time = HZ / (params_rate(params) / params_period_size(params)); snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); @@ -110,7 +134,7 @@ static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - iprtd->timer.expires = jiffies + iprtd->period_time; + imx_ssi_set_next_poll(iprtd); add_timer(&iprtd->timer); if (++fiq_enable == 1) enable_fiq(imx_pcm_fiq); |