tty: serial: qcom-geni-serial: split out the FIFO tx code
qcom_geni_serial_handle_tx() is pretty big, let's move the code that handles the actual writing of data to a separate function which makes sense in preparation for introducing a dma variant of handle_tx(). Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-10-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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