diff options
Diffstat (limited to 'sound/x86/intel_hdmi_audio.c')
| -rw-r--r-- | sound/x86/intel_hdmi_audio.c | 39 |
1 files changed, 25 insertions, 14 deletions
diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c index c0a080e5d1f4..015d57cd9725 100644 --- a/sound/x86/intel_hdmi_audio.c +++ b/sound/x86/intel_hdmi_audio.c @@ -29,6 +29,7 @@ #include <linux/interrupt.h> #include <linux/pm_runtime.h> #include <linux/dma-mapping.h> +#include <linux/delay.h> #include <asm/cacheflush.h> #include <sound/core.h> #include <sound/asoundef.h> @@ -976,8 +977,6 @@ static void had_process_buffer_done(struct snd_intelhad *intelhaddata) had_substream_put(intelhaddata); } -#define MAX_CNT 0xFF - /* * The interrupt status 'sticky' bits might not be cleared by * setting '1' to that bit once... @@ -987,31 +986,37 @@ static void wait_clear_underrun_bit(struct snd_intelhad *intelhaddata) int i; u32 val; - for (i = 0; i < MAX_CNT; i++) { + for (i = 0; i < 100; i++) { /* clear bit30, 31 AUD_HDMI_STATUS */ had_read_register(intelhaddata, AUD_HDMI_STATUS, &val); if (!(val & AUD_HDMI_STATUS_MASK_UNDERRUN)) return; + udelay(100); + cond_resched(); had_write_register(intelhaddata, AUD_HDMI_STATUS, val); } dev_err(intelhaddata->dev, "Unable to clear UNDERRUN bits\n"); } -/* called from irq handler */ -static void had_process_buffer_underrun(struct snd_intelhad *intelhaddata) +/* Perform some reset procedure but only when need_reset is set; + * this is called from prepare or hw_free callbacks once after trigger STOP + * or underrun has been processed in order to settle down the h/w state. + */ +static void had_do_reset(struct snd_intelhad *intelhaddata) { - struct snd_pcm_substream *substream; + if (!intelhaddata->need_reset) + return; - /* Handle Underrun interrupt within Audio Unit */ - had_write_register(intelhaddata, AUD_CONFIG, 0); - intelhaddata->aud_config.regval = 0; /* Reset buffer pointers */ had_reset_audio(intelhaddata); - wait_clear_underrun_bit(intelhaddata); + intelhaddata->need_reset = false; +} - if (!intelhaddata->connected) - return; /* disconnected? - bail out */ +/* called from irq handler */ +static void had_process_buffer_underrun(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; /* Report UNDERRUN error to above layers */ substream = had_substream_get(intelhaddata); @@ -1019,6 +1024,7 @@ static void had_process_buffer_underrun(struct snd_intelhad *intelhaddata) snd_pcm_stop_xrun(substream); had_substream_put(intelhaddata); } + intelhaddata->need_reset = true; } /* @@ -1134,9 +1140,13 @@ static int had_pcm_hw_params(struct snd_pcm_substream *substream, */ static int had_pcm_hw_free(struct snd_pcm_substream *substream) { + struct snd_intelhad *intelhaddata; unsigned long addr; u32 pages; + intelhaddata = snd_pcm_substream_chip(substream); + had_do_reset(intelhaddata); + /* mark back the pages as cached/writeback region before the free */ if (substream->runtime->dma_area != NULL) { addr = (unsigned long) substream->runtime->dma_area; @@ -1188,8 +1198,7 @@ static int had_pcm_trigger(struct snd_pcm_substream *substream, int cmd) spin_unlock(&intelhaddata->had_spinlock); /* Disable Audio */ had_enable_audio(intelhaddata, false); - /* Reset buffer pointers */ - had_reset_audio(intelhaddata); + intelhaddata->need_reset = true; break; default: @@ -1227,6 +1236,8 @@ static int had_pcm_prepare(struct snd_pcm_substream *substream) dev_dbg(intelhaddata->dev, "rate=%d\n", runtime->rate); dev_dbg(intelhaddata->dev, "channels=%d\n", runtime->channels); + had_do_reset(intelhaddata); + /* Get N value in KHz */ disp_samp_freq = intelhaddata->tmds_clock_speed; |