Quoting Douglas Anderson (2022-03-10 13:04:34) > While scoping signals, we found that the PCIe signals weren't > compliant at bootup. Specifically, the bootloader was setting up PCIe > and leaving it configured, then jumping to the kernel. The kernel was > turning off the regulator while leaving the PCIe clock running, which > was a violation. > > In the regulator bindings (and the Linux kernel driver that uses > them), there's currently no way to specify that a GPIO-controlled > regulator should keep its state at bootup. You've got to pick either > "on" or "off". Let's switch it so that the PCIe regulator defaults to > "on" instead of "off". This should be a much safer way to go and > avoids the timing violation. The regulator will still be turned off > later if there are no users. > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> > --- Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
