Commit c8879d3f authored by Michal Grzeschik's avatar Michal Grzeschik Committed by Vinod Koul
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phy: stm32-usphyc: add 200 to 300 us delay to fix timeout on some machines 



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: default avatarMichael Grzeschik <m.grzeschik@pengutronix.de>
Reviewed-by: default avatarFabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20230227151318.1894938-1-m.grzeschik@pengutronix.de


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 84a59a31

drivers/phy/st/phy-stm32-usbphyc.c

+3 −0
Original line number Diff line number Diff line
@@ -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: