From ea157c2ba821dab789a544cd9fbe44dc07036ff8 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Tue, 16 Nov 2021 11:46:21 +0000
Subject: [PATCH] ASoC: codecs: wcd938x: fix volatile register range
Git-commit: ea157c2ba821dab789a544cd9fbe44dc07036ff8
Patch-mainline: v5.16-rc3
References: git-fixes

Interrupt Clear registers WCD938X_INTR_CLEAR_0 -  WCD938X_INTR_CLEAR_2
are not marked as volatile. This has resulted in a missing interrupt bug
while performing runtime pm. regcache_sync() during runtime pm resume path
will write to Interrupt clear registers with previous values which basically
clears the pending interrupt and actual interrupt handler never sees this
interrupt.

This issue is more visible with headset plug-in plug-out case compared to
headset button.

Fix this by adding the Interrupt clear registers to volatile range

Fixes: 8d78602aa87a ("ASoC: codecs: wcd938x: add basic driver")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211116114623.11891-2-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/wcd938x.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/wcd938x.c b/sound/soc/codecs/wcd938x.c
index 52de7d14b139..67151c7770c6 100644
--- a/sound/soc/codecs/wcd938x.c
+++ b/sound/soc/codecs/wcd938x.c
@@ -1174,6 +1174,9 @@ static bool wcd938x_readonly_register(struct device *dev, unsigned int reg)
 	case WCD938X_DIGITAL_INTR_STATUS_0:
 	case WCD938X_DIGITAL_INTR_STATUS_1:
 	case WCD938X_DIGITAL_INTR_STATUS_2:
+	case WCD938X_DIGITAL_INTR_CLEAR_0:
+	case WCD938X_DIGITAL_INTR_CLEAR_1:
+	case WCD938X_DIGITAL_INTR_CLEAR_2:
 	case WCD938X_DIGITAL_SWR_HM_TEST_0:
 	case WCD938X_DIGITAL_SWR_HM_TEST_1:
 	case WCD938X_DIGITAL_EFUSE_T_DATA_0:
-- 
2.26.2