[alsa-devel] [PATCH 08/12] ASoC: intel: kbl_rt5660: 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_rt5660 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_rt5660.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/sound/soc/intel/boards/kbl_rt5660.c b/sound/soc/intel/boards/kbl_rt5660.c
index 3255e00..3150aa9 100644
--- a/sound/soc/intel/boards/kbl_rt5660.c
+++ b/sound/soc/intel/boards/kbl_rt5660.c
@@ -23,6 +23,7 @@
 
 #include "../../codecs/hdac_hdmi.h"
 #include "../../codecs/rt5660.h"
+#include "hdac_hdmi_common.h"
 
 #define KBL_RT5660_CODEC_DAI "rt5660-aif1"
 #define DUAL_CHANNEL 2
@@ -41,6 +42,7 @@ struct kbl_hdmi_pcm {
 struct kbl_codec_private {
 	struct gpio_desc *gpio_lo_mute;
 	struct list_head hdmi_pcm_list;
+	struct device_link *link;
 };
 
 enum {
@@ -222,7 +224,8 @@ 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)
@@ -525,8 +528,17 @@ static const struct platform_device_id kbl_board_ids[] = {
 	{ }
 };
 
+static int kabylake_audio_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+	struct kbl_codec_private *ctx = snd_soc_card_get_drvdata(card);
+
+	return hdac_hdmi_del_device_link(&ctx->link);
+}
+
 static struct platform_driver kabylake_audio = {
 	.probe = kabylake_audio_probe,
+	.remove = kabylake_audio_remove,
 	.driver = {
 		.name = "kbl_rt5660",
 		.pm = &snd_soc_pm_ops,
-- 
2.7.4