John Baldwin 0a34d050ae acpi: Narrow workaround for broken interrupt settings on x86 ... Commit 9a7bf07ccd from 2016 introduced a workaround for some broken BIOSes that specified active-lo instead of active-hi polarity for ISA IRQs for UARTs. The workaround assumed that edge-sensitive ISA IRQs on x86 should always be active-hi. However, some recent AMD systems actually use active-lo edge-sensitive ISA IRQs (and not just for UARTs, but also for the keyboard and PS/2 mouse devices) and the override causes interrupts to be dropped resulting in boot time hangs, non-working keyboards, etc. Add a hw.acpi.override_isa_irq_polarity tunable (readable as a sysctl post-boot) to control this quirk. It can be set to 1 to force enable the override and 0 to disable it. The log of original message mentions an Intel motherboard as the sample case, so default the tunable to 1 on systems with an Intel CPU and 0 otherwise. Special thanks to Matthias Lanter <freebsd@lanter-it.ch> for tracking down boot time issues on recent AMD systems to mismatched interrupt polarity. PR: 270707 Reported by: aixdroix_OSS@protonmail.com, Michael Dexter Reported by: mfw_burn@pm.me, Hannes Hfauswedell <h2+fbsdports@fsfe.org> Reported by: Matthias Lanter <freebsd@lanter-it.ch> Reported by: William Bulley <web@umich.edu> Reviewed by: imp, emaste MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D45554		2024-07-15 12:13:51 -07:00
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