Olivier Certner 6bd543f7a8 acpi_spmc(4): Check DSMs only on attach, do not return 0 on probe
Once we have recognized a device by PNP ID, declare support
unconditionally on probe, and only check for DSMs in attach.

We do this for these reasons:
1. PNP0D80 is de-facto a device supposed to hold DSMs related to
   suspend-to-idle, so we assume it cannot be used for other purposes.
   And if that changes, we need another architecture anyway (e.g., have
   a new driver claiming those devices and behaving like a bus, to which
   this driver would be a sub-driver).
2. If there are no DSMs that we support on such a device, then a new DSM
   was added that the driver does not know about and which "replaces"
   (in terms of functionality) the known ones, or the firmware is buggy.
   In both cases, failing the attach instead of the probe is reasonable,
   as that leads to printing some error which we (and probably users
   too) would like to know about.
3. This is a step to enable multiple instances of this driver (just to
   be a good citizen, and also to be future proof against weird
   firmwares that would, e.g., implement the Microsoft DSM on another
   device than the Intel one).

Reviewed by:    imp (older version), obiwac
Sponsored by:   The FreeBSD Foundation
Differential Revision:  https://reviews.freebsd.org/D56810
2026-05-13 14:38:21 +02:00
2026-05-12 21:26:44 -07:00
2026-05-12 21:12:09 +00:00
2026-02-21 20:53:19 -05:00
2026-05-10 17:53:20 +03:00
2026-05-13 11:26:56 +08:00
2026-05-12 20:24:10 +00:00
2026-02-21 20:53:19 -05:00
2026-05-12 21:26:44 -07:00
2026-05-12 20:05:19 +00:00
2026-03-07 00:51:15 -07:00
2026-01-01 00:29:23 +00:00
2023-12-26 10:28:25 -07:00
2026-05-03 13:53:25 -04:00
2026-05-13 11:13:20 +08:00

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Source code of KekenoBSD
https://kekenobsd.surge.sh
Readme 1.7 GiB
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