• Shawn Guo's avatar
    ARM: imx: fix TLB missing of IOMUXC base address during suspend · 59d05b51
    Shawn Guo authored
    After the suspend routine running in OCRAM puts DDR into self-refresh,
    it will access IOMUXC block to float DDR IO for power saving.  A TLB
    missing of IOMUXC base address may happen in this case, and triggers an
    access to DDR, and thus hangs the system.
    
    The failure is discovered by running suspend/resume on a Cubox-i board.
    Though the issue is not Cubox-i specific, it can be hit the on the board
    quite easily with the 3.15 or 3.16 kernel.
    
    Fix the issue with a dummy access to IOMUXC block at the beginning of
    suspend routine, so that the address translation can be filled into TLB
    before DDR is put into self-refresh.
    Signed-off-by: default avatarShawn Guo <shawn.guo@freescale.com>
    Cc: <stable@vger.kernel.org>
    Acked-by: default avatarAnson Huang <Anson.Huang@freescale.com>
    59d05b51
suspend-imx6.S 8.22 KB