Blackfin Serial driver: Fix bug - serial driver in PIO mode cant handle input very quickly
Output as many bytes as possible in PIO tx handler. This reduce the number of tx interrupts and shorten the delay to handle rx interrupt. So, rx overrun disappears. Signed-off-by: NSonic Zhang <sonic.zhang@analog.com> Signed-off-by: NBryan Wu <bryan.wu@analog.com>
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