[alsa-devel] [PATCH 6/6] ALSA: x86: Allow no-period-wakeup setup

[Takashi Iwai]

In the current implementation, the driver may update the BDs even at
PCM pointer callback.  This allows us to skip the period interrupt
effectively.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/x86/intel_hdmi_audio.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index 979b396272ae..9dacac2b833c 100644
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -133,7 +133,8 @@ static const struct channel_map_table map_tables[] = {
 static const struct snd_pcm_hardware had_pcm_hardware = {
 	.info =	(SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_MMAP |
-		SNDRV_PCM_INFO_MMAP_VALID),
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP),
 	.formats = (SNDRV_PCM_FMTBIT_S16_LE |
 		    SNDRV_PCM_FMTBIT_S24_LE |
 		    SNDRV_PCM_FMTBIT_S32_LE),
@@ -864,7 +865,9 @@ static void had_prog_bd(struct snd_pcm_substream *substream,
 	int ofs = intelhaddata->pcmbuf_filled * intelhaddata->period_bytes;
 	u32 addr = substream->runtime->dma_addr + ofs;
 
-	addr |= AUD_BUF_VALID | AUD_BUF_INTR_EN;
+	addr |= AUD_BUF_VALID;
+	if (!substream->runtime->no_period_wakeup)
+		addr |= AUD_BUF_INTR_EN;
 	had_write_register(intelhaddata, AUD_BUF_ADDR(idx), addr);
 	had_write_register(intelhaddata, AUD_BUF_LEN(idx),
 			   intelhaddata->period_bytes);
-- 
2.11.0