openwrt/target/linux/layerscape/patches-5.4/801-audio-0039-MLK-16224-6-ASoC-fsl_sai-fix-DSD-suspend-resume.patch

From a115bf34468398647e7a8f380058bd597e44e1b3 Mon Sep 17 00:00:00 2001
From: Viorel Suman <viorel.suman@nxp.com>
Date: Mon, 29 Jan 2018 16:04:44 +0200
Subject: [PATCH] MLK-16224-6: ASoC: fsl_sai: fix DSD suspend/resume

With the existing implementation the SAI pinctrl state is restored to
default after resume - this breaks DSD playback after resume.
Restore DSD pinctrl state in snd_soc_dai_driver resume callback.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_sai.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -893,6 +893,23 @@ static int fsl_sai_dai_probe(struct snd_
 	return 0;
 }
 
+static int fsl_sai_dai_resume(struct snd_soc_dai *cpu_dai)
+{
+	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
+	int ret;
+
+	if (sai->is_dsd && !IS_ERR_OR_NULL(sai->pins_dsd)) {
+		ret = pinctrl_select_state(sai->pinctrl, sai->pins_dsd);
+		if (ret) {
+			dev_err(cpu_dai->dev,
+				"failed to set proper pins state: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static struct snd_soc_dai_driver fsl_sai_dai_template = {
 	.probe = fsl_sai_dai_probe,
 	.playback = {
@@ -913,6 +930,7 @@ static struct snd_soc_dai_driver fsl_sai
 		.rates = SNDRV_PCM_RATE_KNOT,
 		.formats = FSL_SAI_FORMATS,
 	},
+	.resume  = fsl_sai_dai_resume,
 	.ops = &fsl_sai_pcm_dai_ops,
 };