On Thu, Nov 09, 2023 at 01:10:12PM +0100, Ahmad Fatoum wrote:
> On the STM32MP1, shutting down barebox can result in a
>
> ERROR: phy1: phy exit failed --> -22
>
> message printed to the console. This is because the regulator is disabled
> more often than it was enabled, because stm32_usbphyc_pll_disable
> is called twice:
>
> - Once from stm32_usbphyc_remove calling stm32_usbphyc_phy_exit
> - Once from dwc2_remove calling phy_exit -> stm32_usbphyc_phy_exit
>
> The code is taken from Linux and likely causes no issues there, because
> devices are removed in reverse probe order, which barebox doesn't
> enforce. Properly solving this would be a larger endeavour, so for now
> just fix the stm32-usbphyc driver to ignore reference count dropping
> below zero and only call __stm32_usbphyc_pll_disable once.
>
> Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
> ---
> drivers/phy/phy-stm32-usbphyc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks
Sascha
>
> diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
> index ac82b019f44c..91f4e7f7e08d 100644
> --- a/drivers/phy/phy-stm32-usbphyc.c
> +++ b/drivers/phy/phy-stm32-usbphyc.c
> @@ -277,7 +277,7 @@ static int __stm32_usbphyc_pll_disable(struct
> stm32_usbphyc *usbphyc)
> static int stm32_usbphyc_pll_disable(struct stm32_usbphyc *usbphyc)
> {
> /* Check if a phy port is still active or clk48 in use */
> - if (atomic_dec_return(&usbphyc->n_pll_cons) > 0)
> + if (atomic_dec_return(&usbphyc->n_pll_cons) != 1)
> return 0;
>
> return __stm32_usbphyc_pll_disable(usbphyc);
> --
> 2.39.2
>
>
>
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