[PATCH v2] phy: stm32-usphyc: add 200 to 300 us delay to fix timeout on some machines

[Michael Grzeschik]

An minimum udelay of 200 us seems to be necessary on some machines. After
the setup of the pll, which needs about 100 us to be locked there seem
to be additional 100 us to get the phy really functional. Without this
delay the usb runs not functional. With this additional short udelay
this issue was not reported again.

Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>

---
v1 -> v2: - changed the mdelay to udelay_range(200, 300), like suggested by fabrice
          - moved the delay to pll enable so it will only be triggered once

 drivers/phy/st/phy-stm32-usbphyc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/phy/st/phy-stm32-usbphyc.c b/drivers/phy/st/phy-stm32-usbphyc.c
index 5bb9647b078f12..dd469f57fba7eb 100644
--- a/drivers/phy/st/phy-stm32-usbphyc.c
+++ b/drivers/phy/st/phy-stm32-usbphyc.c
@@ -317,6 +317,9 @@ static int stm32_usbphyc_pll_enable(struct stm32_usbphyc *usbphyc)
 
 	stm32_usbphyc_set_bits(pll_reg, PLLEN);
 
+	/* Wait for maximum lock time */
+	usleep_range(200, 300);
+
 	return 0;
 
 reg_disable:
-- 
2.30.2