Messages in this thread | | | Date | Mon, 21 Apr 2014 13:39:01 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH V6] serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers |
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On 04/17/2014 12:06 AM, Yoshihiro YUNOMAE wrote: > Add tunable RX interrupt trigger I/F of FIFO buffers. > Serial devices are used as not only message communication devices but control > or sending communication devices. For the latter uses, normally small data > will be exchanged, so user applications want to receive data unit as soon as > possible for real-time tendency. If we have a sensor which sends a 1 byte data > each time and must control a device based on the sensor feedback, the RX > interrupt should be triggered for each data. > > According to HW specification of serial UART devices, RX interrupt trigger > can be changed, but the trigger is hard-coded. For example, RX interrupt trigger > in 16550A can be set to 1, 4, 8, or 14 bytes for HW, but current driver sets > the trigger to only 8bytes. > > This patch makes some devices change RX interrupt trigger from userland.
Reviewed-by: Stephen Warren <swarren@nvidia.com>
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