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

[Michael Grzeschik]

Cc'ing: Greg Kroah-Hartman <gregkh at linuxfoundation.org>


On Mon, Mar 20, 2023 at 01:02:10PM +0100, Michael Grzeschik wrote:
>Gentle Ping!
>
>On Fri, Mar 10, 2023 at 11:44:38AM +0100, Michael Grzeschik wrote:
>>Hi Fabrice,
>>
>>On Tue, Feb 28, 2023 at 06:28:21PM +0100, Fabrice Gasnier wrote:
>>>On 2/27/23 16:13, Michael Grzeschik wrote:
>>>>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>
>>>>
>>>
>>>Hi Michael,
>>>
>>>Thank you for the updates,
>>>
>>>Fell free to add my:
>>>Reviewed-by: Fabrice Gasnier <fabrice.gasnier at foss.st.com>
>>
>>Thanks!
>>
>>Through which tree will this be picked?
>>Will it be possible to add this to v6.3?

Hi Greg!

Since nobody seem to catch this, is it possible that you pick this?

Regards,
Michael

>>>>---
>>>>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:
>>>
>>
>>-- 
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>Pengutronix e.K.                           |                             |
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-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
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