My hardware: Intel NUC10i7FNH1 card reader enabled in BIOS uname: 4.19.0-11-amd64 #1 SMP Debian 4.19.146-1 (2020-09-17) x86_64 GNU/Linux lspci -nn: 3b:00.0 SD Host controller [0805]: Genesys Logic, Inc Device [17a0:9755]
I've seen this mentioned in 2 other cases: "According to SD spec 3.00 3.6.1 signal voltage switch procedure, host should wait 5ms after set 1.8V signal enable bit in Host Control 2 register and check if 1.8V is stable or not. On some cards, found without the delay would see "1.8V regulator output did not became stable" err log." "For some reason the Host Control2 register of the Xenon SDHCI controller sometimes reports the bit representing 1.8V signaling as 0 when read after it was written as 1. Subsequent read reports 1. This causes the sdhci_start_signal_voltage_switch function to report 1.8V regulator output did not become stable" -- Bruce Morgan blmor...@gmail.com
