From: bugzilla-daemon@bugzilla.kernel.org
To: platform-driver-x86@vger.kernel.org
Subject: [Bug 213579] Clevo NH55HJ (intel tigerlake) touchpad support (GPIO can't be used as IRQ)
Date: Wed, 21 Jul 2021 12:56:47 +0000 [thread overview]
Message-ID: <bug-213579-215701-nzm5CnuL5G@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-213579-215701@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=213579
--- Comment #18 from Andy Shevchenko (andy.shevchenko@gmail.com) ---
Citing the hardware level documentation:
"Each GPIO pad ownership assignment is pre-determined via OEM system
configuration through BIOS, soft strap and/or embedded subsystems’ firmware
settings with corresponding pin list documentation.
...
In summary the pad ownership bit is used to determine:
GPIO input event notification/status update to the subsystem owning the pad
o setting of Host’s various interrupt status bits
...
...
PAD Ownership (PAD_OWN)
This register can be written by [Firmware] only.
...
00 = Host software (ACPI Mode or GPIO Driver Mode) has ownership of the pad. In
Host GPIO Driver Mode (refer to HOSTSW_OWN), GPIO input event update is limited
to GPI_STS update only. While in Host ACPI Mode, updates are limited to
GPI_GPE_STS, GPI_NMI_STS and/or GPI_SMI_STS."
Sorry, but OEM has to fix this. I love to know how Windows works around this.
If anybody has that information, please share.
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next prev parent reply other threads:[~2021-07-21 12:56 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-213579-215701@https.bugzilla.kernel.org/>
2021-06-29 23:38 ` [Bug 213579] Clevo NH55HJ (intel tigerlake) touchpad support (GPIO can't be used as IRQ) bugzilla-daemon
2021-07-04 11:39 ` bugzilla-daemon
2021-07-04 14:33 ` bugzilla-daemon
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