Searched hist:"69646 d7a3689fbe1a65ae90397d22ac3f1b8d40f" (Results 1 – 1 of 1) sorted by relevance
| /openbmc/linux/drivers/tty/serial/ |
| H A D | atmel_serial.c | diff 69646d7a3689fbe1a65ae90397d22ac3f1b8d40f Tue Mar 19 08:20:35 CDT 2019 Razvan Stefanescu <razvan.stefanescu@microchip.com> tty/serial: atmel: RS485 HD w/DMA: enable RX after TX is stopped
In half-duplex operation, RX should be started after TX completes.
If DMA is used, there is a case when the DMA transfer completes but the
TX FIFO is not emptied, so the RX cannot be restarted just yet.
Use a boolean variable to store this state and rearm TX interrupt mask
to be signaled again that the transfer finished. In interrupt transmit
handler this variable is used to start RX. A warning message is generated
if RX is activated before TX fifo is cleared.
Fixes: b389f173aaa1 ("tty/serial: atmel: RS485 half duplex w/DMA: enable
RX after TX is done")
Signed-off-by: Razvan Stefanescu <razvan.stefanescu@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|