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Add code to re-enable GPIOP0 and GPIOP1 into a pass-through function aft= er they are requested as a GPIO function in the x86-power-control package. = (Or maybe to create a script with "devmem > 0x1e6e24BC 32 0x0F000000" comma= nd that will be run automatically after system up to change register direct= ly.) 2. Modify pinctrl in Kernel that will not disable GPIOP0 and GPIOP1's pass-= through function if they already are configured as a pass-through when they= are requesting as a GPIO function. Regards, Chris Chen -----Original Message----- From: Andrew Jeffery =20 Sent: Tuesday, August 17, 2021 9:58 AM To: Chris Chen (TPI) ; Bills, Jason M ; openbmc@lists.ozlabs.org Subject: Re: [x86-power-control]: press the power button for a long time th= at can't force turn off system power On Mon, 16 Aug 2021, at 20:15, Chris Chen (TPI) wrote: > Hi Andrew, >=20 > Thanks for your hint (CONFIG_DEBUG_PINCTRL=3Dy) that let me see where=20 > the passthrough setting was disabled. > =3D=3D=3D=3D=3D=3D > [ 11.631044] aspeed-g6-pinctrl 1e6e2000.syscon:pinctrl: request pin=20 > 120 (AB22) for 1e780000.gpio:120=20 > [ 11.631064] Muxing pin 120 for GPIO > [ 11.631071] Disabling signal PWM8 for PWM8 > [ 11.631087] Want SCU41C[0x01000000]=3D0x1, got 0x0 from 0x000000C0 > [ 11.631094] Disabling signal THRUIN0 for THRU0 > [ 11.631102] Want SCU4BC[0x01000000]=3D0x1, got 0x1 from 0x0F000000 > [ 11.631118] Want SCU4BC[0x01000000]=3D0x0, got 0x0 from 0x0E000000 > [ 11.631124] Enabling signal GPIOP0 for GPIOP0 > =3D=3D=3D=3D=3D=3D >=20 > But something strange is the logs seems from "x86-power-control"=20 > package because it would not appear after I commented out partial code=20 > as below in the package. > Could you or others tell me why, please? I mean did I miss any=20 > configurations or code changes or anything when using the=20 > "x86-power-control" package? >=20 > #if 0 //Added by Chris for testing=20 > // Request POWER_BUTTON GPIO events > if (!powerButtonName.empty()) > { > if (!requestGPIOEvents(powerButtonName, powerButtonHandler, > powerButtonLine, powerButtonEvent)) > { > return -1; > } > } > else > { > phosphor::logging::log( > "powerButton name should be configured from json config file"= ); > return -1; > } > #endif //Added by Chris for testing Requesting the pin as GPIO removes the pass-through mux configuration. If you want the pass-through behaviour when you obtain the pin as a GPIO th= en you need to also do that in software by requesting the GPIOP1 pin and se= tting it to the state of the GPIOP0 pin when GPIOP0 changes. This is a limitation of the kernel, though I'm open to ideas on how to avoi= d it. Separately, I encourage you to encourage the author of the kernel patch tha= t added pass-through support to send their changes upstream. >=20 > Another, last time I forgot to say that I have tried to use "devmem=20 > 0x1e6e24BC 32 0x0F000000" to set passthrough back manually and the=20 > power button works fine. This is why I think the passthrough was gone=20 > after the system booting up. I think it's possible to sense the input pin state even in the pass-through= configuration, but at the point where you request the GPIO via pinctrl we'= ve lost the intent of the request and the mux configuration mustn't assume = any particular mode of use. As such it disables the pass-through mode and p= uts GPIOP0 in regular GPIO mode. > Legal Disclaimer : > The information contained in this message may be privileged and=20 > confidential. > It is intended to be read only by the individual or entity to whom it=20 > is addressed or by their designee. If the reader of this message is=20 > not the intended recipient, you are on notice that any distribution of=20 > this message, in any form, is strictly prohibited. If you have=20 > received this message in error, please immediately notify the sender=20 > and delete or destroy any copy of this message! On a separate note, please don't include these disclaimers on mail sent to = the mailing list. Andrew