* Faiz Abbas <a0230074@xxxxxx> [190502 14:30]: > Hi Tony, > > On 02/05/19 7:50 PM, Tony Lindgren wrote: > > * Faiz Abbas <faiz_abbas@xxxxxx> [190502 01:48]: > >> If UHS speed modes are enabled, a compatible SD card switches down to > >> 1.8V during enumeration. If after this a software reboot/crash takes > >> place and on-chip ROM tries to enumerate the SD card, the difference in > >> IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card. > >> > >> The fix for this is to have support for power cycling the card in > >> hardware (with a PORz/soft-reset line causing a power cycle of the > >> card). Since am571x-, am572x- and am574x-idk don't have this > >> capability, disable voltage switching for these boards. > >> > >> The major effect of this is that the maximum supported speed > >> mode is now high speed(50 MHz) down from SDR104(200 MHz). > > > > This sounds a bit urgent, does it also need a stable tag or is > > it safe to apply against any earlier kernels? > > > > This should be good to apply on any previous releases. OK applying both your MMC patches into fixes today. Thanks, Tony
