linux-kernel - [PATCH] ASoC: max98373: Mark cache dirty before entering sleep

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Date:   Fri, 24 Sep 2021 15:13:05 -0700
From:   Ryan Lee <ryans.lee@...imintegrated.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, yung-chuan.liao@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com,
        guennadi.liakhovetski@...ux.intel.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     sathya.prakash.m.r@...el.com, ryan.lee.maxim@...il.com,
        Ryan Lee <ryans.lee@...imintegrated.com>
Subject: [PATCH] ASoC: max98373: Mark cache dirty before entering sleep

Amp lose its register values in case amp power loss or
'ForceReset' over Soundwire SCP_ctrl register(0x0044) or
HW_RESET pin control during the audio suspend and resume.
Mark cache dirty before audio suspension to restore
existing values when audio resume.

Signed-off-by: Ryan Lee <ryans.lee@...imintegrated.com>
---
 sound/soc/codecs/max98373-sdw.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/max98373-sdw.c b/sound/soc/codecs/max98373-sdw.c
index dc520effc61c..a7e4a6e880b0 100644
--- a/sound/soc/codecs/max98373-sdw.c
+++ b/sound/soc/codecs/max98373-sdw.c
@@ -259,6 +259,7 @@ static __maybe_unused int max98373_suspend(struct device *dev)
 		regmap_read(max98373->regmap, max98373->cache[i].reg, &max98373->cache[i].val);
 
 	regcache_cache_only(max98373->regmap, true);
+	regcache_mark_dirty(max98373->regmap);
 
 	return 0;
 }
-- 
2.17.1