• Lukas Wunner's avatar
    can: hi311x: Use level-triggered interrupt · f164d020
    Lukas Wunner authored
    If the hi3110 shares the SPI bus with another traffic-intensive device
    and packets are received in high volume (by a separate machine sending
    with "cangen -g 0 -i -x"), reception stops after a few minutes and the
    counter in /proc/interrupts stops incrementing.  Bus state is "active".
    Bringing the interface down and back up reconvenes the reception.  The
    issue is not observed when the hi3110 is the sole device on the SPI bus.
    
    Using a level-triggered interrupt makes the issue go away and lets the
    hi3110 successfully receive 2 GByte over the course of 5 days while a
    ks8851 Ethernet chip on the same SPI bus handles 6 GByte of traffic.
    
    Unfortunately the hi3110 datasheet is mum on the trigger type.  The pin
    description on page 3 only specifies the polarity (active high):
    http://www.holtic.com/documents/371-hi-3110_v-rev-kpdf.do
    
    Cc: Mathias Duckeck <m.duckeck@kunbus.de>
    Cc: Akshay Bhat <akshay.bhat@timesys.com>
    Cc: Casey Fitzpatrick <casey.fitzpatrick@timesys.com>
    Signed-off-by: default avatarLukas Wunner <lukas@wunner.de>
    Cc: linux-stable <stable@vger.kernel.org>
    Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
    f164d020
holt_hi311x.txt 663 Bytes