Quoting Sandeep Maheswaram (2021-04-13 23:03:29) > This patch adds a shutdown callback to USB DWC core driver to ensure that > it is properly shutdown in reboot/shutdown path. This is required > where SMMU address translation is enabled like on SC7180 > SoC and few others. If the hardware is still accessing memory after > SMMU translation is disabled as part of SMMU shutdown callback in > system reboot or shutdown path, then IOVAs(I/O virtual address) > which it was using will go on the bus as the physical addresses which > might result in unknown crashes (NoC/interconnect errors). > > Signed-off-by: Sandeep Maheswaram <sanm@xxxxxxxxxxxxxx> > --- Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
