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Subject[PATCH AUTOSEL 5.4 006/187] ASoC: max98090: exit workaround earlier if PLL is locked
Date
From: Tzung-Bi Shih <tzungbi@google.com>

[ Upstream commit 6f49919d11690a9b5614445ba30fde18083fdd63 ]

According to the datasheet, PLL lock time typically takes 2 msec and
at most takes 7 msec.

Check the lock status every 1 msec and exit the workaround if PLL is
locked.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20191122073114.219945-3-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>
---
sound/soc/codecs/max98090.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index 12cb87c0d463..f531e5a11bdd 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -2108,6 +2108,8 @@ static void max98090_pll_work(struct work_struct *work)
struct max98090_priv *max98090 =
container_of(work, struct max98090_priv, pll_work);
struct snd_soc_component *component = max98090->component;
+ unsigned int pll;
+ int i;

if (!snd_soc_component_is_active(component))
return;
@@ -2127,8 +2129,16 @@ static void max98090_pll_work(struct work_struct *work)
snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN,
M98090_SHDNN_MASK, M98090_SHDNN_MASK);

- /* Give PLL time to lock */
- msleep(10);
+ for (i = 0; i < 10; ++i) {
+ /* Give PLL time to lock */
+ usleep_range(1000, 1200);
+
+ /* Check lock status */
+ pll = snd_soc_component_read32(
+ component, M98090_REG_DEVICE_STATUS);
+ if (!(pll & M98090_ULK_MASK))
+ break;
+ }
}

static void max98090_jack_work(struct work_struct *work)
--
2.20.1
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