On Sun, 19 Apr 2020 07:37:46 +0200 Marek Behún <marek.behun@xxxxxx> wrote: > 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 > > When CONFIG_PM is enabled, the host is suspended and resumend many > times, and in each resume the switch to 1.8V is called, and so the > kernel log reports this message annoyingly often. > > Do an empty read of the Host Control2 register in Xenon's > .voltage_switch method to circumvent this. > > Signed-off-by: Marek Behún <marek.behun@xxxxxx> I should probably add a Fixes tag here so that it gets backported to stable versions. BTW this happens on Turris Mox.
