• Daniel Lezcano's avatar
    arm64: dts: hi6220: Reset the mmc hosts · 0fbdf995
    Daniel Lezcano authored
    The MMC hosts could be left in an unconsistent or uninitialized state from
    the firmware. Instead of assuming, the firmware did the right things, let's
    reset the host controllers.
    
    This change fixes a bug when the mmc2/sdio is initialized leading to a hung
    task:
    
    [  242.704294] INFO: task kworker/7:1:675 blocked for more than 120 seconds.
    [  242.711129]       Not tainted 4.9.0-rc8-00017-gcf0251f #3
    
    
    [  242.716571] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [  242.724435] kworker/7:1     D    0   675      2 0x00000000
    [  242.729973] Workqueue: events_freezable mmc_rescan
    [  242.734796] Call trace:
    [  242.737269] [<ffff00000808611c>] __switch_to+0xa8/0xb4
    [  242.742437] [<ffff000008d07c04>] __schedule+0x1c0/0x67c
    [  242.747689] [<ffff000008d08254>] schedule+0x40/0xa0
    [  242.752594] [<ffff000008d0b284>] schedule_timeout+0x1c4/0x35c
    [  242.758366] [<ffff000008d08e38>] wait_for_common+0xd0/0x15c
    [  242.763964] [<ffff000008d09008>] wait_for_completion+0x28/0x34
    [  242.769825] [<ffff000008a1a9f4>] mmc_wait_for_req_done+0x40/0x124
    [  242.775949] [<ffff000008a1ab98>] mmc_wait_for_req+0xc0/0xf8
    [  242.781549] [<ffff000008a1ac3c>] mmc_wait_for_cmd+0x6c/0x84
    [  242.787149] [<ffff000008a26610>] mmc_io_rw_direct_host+0x9c/0x114
    [  242.793270] [<ffff000008a26aa0>] sdio_reset+0x34/0x7c
    [  242.798347] [<ffff000008a1d46c>] mmc_rescan+0x2fc/0x360
    
    [ ... ]
    
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
    Signed-off-by: default avatarWei Xu <xuwei5@hisilicon.com>
    0fbdf995
hi6220.dtsi 23.3 KB