• Faiz Abbas's avatar
    ARM: dts: am57xx-idk: Remove support for voltage switching for SD card · e5675972
    Faiz Abbas authored
    commit 88a74841 upstream.
    
    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).
    
    Cc: <stable@vger.kernel.org>
    Signed-off-by: default avatarFaiz Abbas <faiz_abbas@ti.com>
    Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    e5675972
am57xx-idk-common.dtsi 10.1 KB