On 05/04/17 16:00, Hans de Goede wrote:
> Commit e5bbf30733f9 ("mmc: sdhci-acpi: Ensure connected devices are
> powered when probing") introduced unconditional calling of
> acpi_device_fix_up_power() on the mmc controller and its children.
>
> This broke wifi on some systems because acpi_device_fix_up_power()
> was called even for disabled children sometimes leaving gpio-s in
> a state where wifi would not work, this was fixed in
> commit e1d070c3793a ("mmc: sdhci-acpi: Only powered up enabled acpi
> child devices").
>
> Unfortunately on some devices calling acpi_device_fix_up_power()
> still causes issues. Specifically on the GPDwin mini clam-shell PC
> which has a pcie wifi module, it causes the wifi module to get
> turned off. This is a BIOS bug and I've tried to get the manufacturer
> to fix this but sofar they have not responded (and even if they do
> then we cannot assume all users will update their BIOS).
>
> This commit adds a new sdhci_acpi.fix_up_power_blacklist module option
> which can be set to an ACPI hid:uid pair, e.g. "80860F14:2" to disable
> the calling of acpi_device_fix_up_power() for the sdhci host matching
> the hid:uid pair, fixing the wifi not working on this machine.
Sorry for the slow reply :-(. I would much prefer to blacklist the whole
device i.e. if the firmware is broken then the device is broken.
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