From acb874a7c049ec49d8fc66c893170fb42c01bdf7 Mon Sep 17 00:00:00 2001
From: Tzung-Bi Shih <tzungbi@google.com>
Date: Fri, 22 Nov 2019 15:31:12 +0800
Subject: [PATCH] ASoC: max98090: remove msleep in PLL unlocked workaround
Git-commit: acb874a7c049ec49d8fc66c893170fb42c01bdf7
Patch-mainline: v5.5-rc3
References: git-fixes
It was observed Baytrail-based chromebooks could cause continuous PLL
unlocked when using playback stream and capture stream simultaneously.
Specifically, starting a capture stream after started a playback stream.
As a result, the audio data could corrupt or turn completely silent.
As the datasheet suggested, the maximum PLL lock time should be 7 msec.
The workaround resets the codec softly by toggling SHDN off and on if
PLL failed to lock for 10 msec. Notably, there is no suggested hold
time for SHDN off.
On Baytrail-based chromebooks, it would easily happen continuous PLL
unlocked if there is a 10 msec delay between SHDN off and on. Removes
the msleep().
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20191122073114.219945-2-tzungbi@google.com
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
sound/soc/codecs/max98090.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index f6bf4cfbea23..12cb87c0d463 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -2114,10 +2114,16 @@ static void max98090_pll_work(struct work_struct *work)
dev_info_ratelimited(component->dev, "PLL unlocked\n");
+ /*
+ * As the datasheet suggested, the maximum PLL lock time should be
+ * 7 msec. The workaround resets the codec softly by toggling SHDN
+ * off and on if PLL failed to lock for 10 msec. Notably, there is
+ * no suggested hold time for SHDN off.
+ */
+
/* Toggle shutdown OFF then ON */
snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN,
M98090_SHDNN_MASK, 0);
- msleep(10);
snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN,
M98090_SHDNN_MASK, M98090_SHDNN_MASK);
--
2.16.4