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Code implementing .receive_buf() callback can potentially call
serdev_device_write(), which will call serdev_device_poller(). We need
to make sure that such a call is a no-op in order to prevent
corrupting shared data buffer as well as breaking .receive_buf
callback that most likely does not expect that to happen.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-by: Cory Tusar <cory.tusar@zii.aero>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Due to blocking, synchronous, polling driven nature of Barebox's
serial communication handling trying to use two or more serial ports
at high (1Mbaud+) baudrates results in data loss and noticeable
perofmance degradation. This happens as soon as individual message
being sent around start exceeding HW Rx FIFO in size.
A good example of such a usecase would be using a system that has a
serdev driver (operating @ 1Mbaud+) and trying to do a X/YMODEM
transfer via serial console at comparable baudrates.
To at least partially ameliorate the problem, add code that will
expose "polling_interval" as a parameter, so that the user would have
an option of temporarily disabling (or significatly decreasing the
rate) of a given serdev's polling.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Add example implementation of a trivial blocking read function as a
part of Barebox's serdev API.
NOTE: This code has not been tested against real devices, so use it at
your own risk.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Port 'serdev' UART-slave deivce framework found in recent Linux
kernels (post 4.13) in order to be able to port 'serdev' slave drivers
from Linux.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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