[alsa-devel] [PATCH v3 09/12] ASoC: intel: kbl_rt5663_max98927 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 kbl_rt5663_max98927 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/kbl_rt5663_max98927.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
index d714752..48b9e08 100644
--- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
@@ -31,6 +31,7 @@
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
+#include "hdac_hdmi_common.h"
 
 #define KBL_REALTEK_CODEC_DAI "rt5663-aif"
 #define KBL_MAXIM_CODEC_DAI "max98927-aif1"
@@ -53,6 +54,7 @@ struct kbl_rt5663_private {
 	struct list_head hdmi_pcm_list;
 	struct clk *mclk;
 	struct clk *sclk;
+	struct device_link *link;
 };
 
 enum {
@@ -336,7 +338,8 @@ static int kabylake_hdmi_init(struct snd_soc_pcm_runtime *rtd, int device)
 
 	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 kabylake_hdmi1_init(struct snd_soc_pcm_runtime *rtd)
-- 
2.7.4