From 58a972efd21bb5adadd97f2546693ec64bfc99b9 Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Mon, 11 Nov 2019 16:33:41 -0600
Subject: [PATCH] ASoC: SOF: PM: add check before setting d0_substate
Git-commit: 58a972efd21bb5adadd97f2546693ec64bfc99b9
Patch-mainline: v5.5-rc1
References: jsc#SLE-16518
Add check before seeting d0_substate and return success if Audio DSP is
already in the target substate.
Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111223343.19986-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
sound/soc/sof/pm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 3204c92f0e7d..b89810bf3230 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -416,6 +416,9 @@ int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
{
int ret;
+ if (sdev->d0_substate == d0_substate)
+ return 0;
+
/* do platform specific set_state */
ret = snd_sof_dsp_set_power_state(sdev, d0_substate);
if (ret < 0)
--
2.16.4