linux-kernel - [PATCH v3 8/8] ASoC: cs42l42: Wait for debounce interval after resume

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Date:   Fri, 27 Jan 2023 16:51:11 +0000
From:   Stefan Binding <sbinding@...nsource.cirrus.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v3 8/8] ASoC: cs42l42: Wait for debounce interval after resume

Since clock stop causes bus reset on Intel controllers, we need
to wait for the debounce interval on resume, to ensure all the
interrupt status registers are set correctly.

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
---
 sound/soc/codecs/cs42l42-sdw.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs42l42-sdw.c b/sound/soc/codecs/cs42l42-sdw.c
index 0de370b40eaf0..79023268d4c1b 100644
--- a/sound/soc/codecs/cs42l42-sdw.c
+++ b/sound/soc/codecs/cs42l42-sdw.c
@@ -447,7 +447,9 @@ static int __maybe_unused cs42l42_sdw_handle_unattach(struct cs42l42_private *cs
 
 static int __maybe_unused cs42l42_sdw_runtime_resume(struct device *dev)
 {
+	static const unsigned int ts_dbnce_ms[] = { 0, 125, 250, 500, 750, 1000, 1250, 1500};
 	struct cs42l42_private *cs42l42 = dev_get_drvdata(dev);
+	unsigned int dbnce;
 	int ret;
 
 	dev_dbg(dev, "Runtime resume\n");
@@ -456,8 +458,14 @@ static int __maybe_unused cs42l42_sdw_runtime_resume(struct device *dev)
 		return 0;
 
 	ret = cs42l42_sdw_handle_unattach(cs42l42);
-	if (ret < 0)
+	if (ret < 0) {
 		return ret;
+	} else if (ret > 0) {
+		dbnce = max(cs42l42->ts_dbnc_rise, cs42l42->ts_dbnc_fall);
+
+		if (dbnce > 0)
+			msleep(ts_dbnce_ms[dbnce]);
+	}
 
 	regcache_cache_only(cs42l42->regmap, false);
 
-- 
2.34.1