GL9755 SD card reader (`17a0:9755`): hwdb autosuspend workaround insufficient - card detection silent on boot, module reload required

[mkurz]

Summary

The hwdb workaround introduced in f3dde321 prevents the SError crash, but the GL9755 SD card reader still fails to detect card insertions on every boot. A manual sdhci_pci module reload is required to make the reader functional.

Hardware

• MacBook Pro M1 (14-inch)
• Asahi kernel 6.18.15 (with fairydust branch applied)

Observed behaviour

After a clean boot, inserting an SD card produces no output in dmesg or journalctl. The reader is completely silent.

lspci -k confirms the driver is bound:

02:00.0 SD Host controller: Genesys Logic, Inc GL9755 SD Host Controller (rev 01)
        Kernel driver in use: sdhci-pci

The hwdb rule is correctly applied:

$ udevadm info /sys/bus/pci/devices/0000:02:00.0 | grep -i autosuspend
E: ID_AUTOSUSPEND=0

The device is active (not suspended):

$ cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_status
active

The mmc host mmc0 is registered and linked to the GL9755, but its sysfs directory is nearly empty - no rescan attribute, no card-related attributes. dmesg | grep -iE "sdhci|mmc" returns nothing after boot, despite the journal showing correct initialization at boot time:

kernel: sdhci-pci 0000:02:00.0: SDHCI controller found [17a0:9755] (rev 1)
kernel: mmc0: SDHCI controller on PCI [0000:02:00.0] using ADMA 64-bit

Workaround

Reloading the sdhci_pci module after boot restores full functionality:

sudo modprobe -r sdhci_pci && sudo modprobe sdhci_pci

After this, card insertion is detected immediately and the reader works normally (this was done while card is inserted already).

[mkurz]

I am not the only one experiencingt this problem - two more people in the Fedora Asahi channel confirm the bug.