ASoC: max98090: remove msleep in PLL unlocked workaround

[ Upstream commit acb874a7c049ec49d8fc66c893170fb42c01bdf7 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index 89b6e187ac235f3161e10a8bb1a6035af8d56d0d..a5b0c40ee545f5c791fd2770894e6d1e83782a6f 100644 (file)
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -2130,10 +2130,16 @@ static void max98090_pll_work(struct max98090_priv *max98090)
 
        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);