[alsa-devel] [PATCH v3 04/12] ASoC: intel: bxt_rt298: add device_link to HDMI audio

[libin.yang at intel.com]

From: Libin Yang <libin.yang at intel.com>

In resume from S3, HDAC HDMI codec driver dapm event callback may be
operated before HDMI codec driver turns on the display audio power
domain because of the contest between display driver and hdmi codec driver.

This patch adds the device_link between bxt_rt298 machine device
(consumer) and hdmi codec device (supplier) to make sure the sequence is
always correct.

Signed-off-by: Libin Yang <libin.yang at intel.com>
---
 sound/soc/intel/boards/bxt_rt298.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/intel/boards/bxt_rt298.c b/sound/soc/intel/boards/bxt_rt298.c
index e91057f..67794c0 100644
--- a/sound/soc/intel/boards/bxt_rt298.c
+++ b/sound/soc/intel/boards/bxt_rt298.c
@@ -26,6 +26,7 @@
 #include <sound/pcm_params.h>
 #include "../../codecs/hdac_hdmi.h"
 #include "../../codecs/rt298.h"
+#include "hdac_hdmi_common.h"
 
 /* Headset jack detection DAPM pins */
 static struct snd_soc_jack broxton_headset;
@@ -39,6 +40,7 @@ struct bxt_hdmi_pcm {
 
 struct bxt_rt286_private {
 	struct list_head hdmi_pcm_list;
+	struct device_link *link;
 };
 
 enum {
@@ -204,7 +206,8 @@ static int broxton_hdmi_init(struct snd_soc_pcm_runtime *rtd)
 
 	list_add_tail(&pcm->head, &ctx->hdmi_pcm_list);
 
-	return 0;
+	/* Setup a device_link between machine device and HDMI codec device. */
+	return hdac_hdmi_add_device_link(rtd->card->dev, dai->dev, &ctx->link);
 }
 
 static int broxton_ssp5_fixup(struct snd_soc_pcm_runtime *rtd,
-- 
2.7.4