Hi Rafael,
Commit c10383e8ddf4 ("ACPI: scan: Release PM resources blocked by
unused objects") adds a:
bus_for_each_dev(&acpi_bus_type, NULL, NULL, acpi_dev_turn_off_if_unused);
call to acpi_scan_init(). On some devices with buggy DSDTs calling
_PS3 for one device may result in it turning off another device.
Specifically the DSDT of the GPD win and GPD pocket devices has a
"\\_SB_.PCI0.SDHB.BRC1" device for a non existing SDIO wifi module
which _PS3 method sets a GPIO causing the PCI wifi card to turn off.
I've an earlier, in some ways simpler, fix for this here:
https://fedorapeople.org/~jwrdegoede/0001-ACPI-scan-Skip-turning-off-some-unused-objects-durin.patch
But the sdhci-acpi.c MMC host code already has an older workaround
for it to not toggle power on this broken ACPI object; and this
simpler fix would require keeping that workaround. So then we would
have 2 workarounds for the same issue in the kernel.
Thus instead I've come up with a slightly different approach which
IMHO has ended up pretty well.
Patches 1-3 of this series are this different approach and assuming
they are considered ok must be merged into 5.16 to fix the regression
caused by commit c10383e8ddf4 on these devices.
Patch 4 removes the now no longer necessary workaround for the same
issue from the sdhci-acpi.c code. Once 1-3 are merged this could
also go to 5.16 but 5.17 is fine too.
Patch 5 is a small bonus cleanup to the sdhci-acpi.c code.
Regards,
Hans
Hans de Goede (5):
ACPI: Change acpi_device_always_present() into
acpi_device_override_status()
ACPI: x86: Allow specifying acpi_device_override_status() quirks by
path
ACPI: x86: Add not-present quirk for the PCI0.SDHB.BRC1 device on the
GPD win
mmc: sdhci-acpi: Remove special handling for GPD win/pocket devices
mmc: sdhci-acpi: Use the new soc_intel_is_byt() helper
drivers/acpi/bus.c | 4 +-
drivers/acpi/x86/utils.c | 114 ++++++++++++++++++++++++----------
drivers/mmc/host/sdhci-acpi.c | 78 ++---------------------
include/acpi/acpi_bus.h | 5 +-
4 files changed, 91 insertions(+), 110 deletions(-)
--
2.31.1
