• Hans de Goede's avatar
    mmc: sdhci: Disable runtime pm when the sdio_irq is enabled · 41ece35e
    Hans de Goede authored
    commit 923713b3 upstream.
    
    SDIO cards may need clock to send the card interrupt to the host.
    
    On a cherrytrail tablet with a RTL8723BS wifi chip, without this patch
    pinging the tablet results in:
    
    PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
    64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=78.6 ms
    64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1760 ms
    64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=753 ms
    64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=3.88 ms
    64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=795 ms
    64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1841 ms
    64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=810 ms
    64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1860 ms
    64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=812 ms
    64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=48.6 ms
    
    Where as with this patch I get:
    
    PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
    64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=3.96 ms
    64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1.97 ms
    64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=17.2 ms
    64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=2.46 ms
    64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=2.83 ms
    64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1.40 ms
    64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=2.10 ms
    64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1.40 ms
    64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=2.04 ms
    64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=1.40 ms
    
    Cc: Dong Aisheng <b29396@freescale.com>
    Cc: Ian W MORRISON <ianwmorrison@gmail.com>
    Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
    Acked-by: default avatarDong Aisheng <aisheng.dong@nxp.com>
    Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    41ece35e
sdhci.c 97.9 KB