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serial: sh-sci: Stop dmaengine transfer in sci_stop_tx()

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commit 08a84410a04f05c7c1b8e833f552416d8eb9f6fe upstream.

Stop dmaengine transfer in sci_stop_tx(). Otherwise, the following
message is possible output when system enters suspend and while
transferring data, because clearing TIE bit in SCSCR is not able to
stop any dmaengine transfer.

    sh-sci e6550000.serial: ttySC1: Unable to drain transmitter

Note that this driver has already used some #ifdef in the .c file
so that this patch also uses #ifdef to fix the issue. Otherwise,
build errors happens if the CONFIG_SERIAL_SH_SCI_DMA is disabled.

Fixes: 73a19e4c03 ("serial: sh-sci: Add DMA support.")
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20210610110806.277932-1-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2021-06-10 20:08:06 +09:00 committed by Greg Kroah-Hartman
parent 17451bd036
commit 23055da561
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/serial/sh-sci.c
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@ -610,6 +610,14 @@ static void sci_stop_tx(struct uart_port *port)
ctrl &= ~SCSCR_TIE;
serial_port_out(port, SCSCR, ctrl);
#ifdef CONFIG_SERIAL_SH_SCI_DMA
if (to_sci_port(port)->chan_tx &&
!dma_submit_error(to_sci_port(port)->cookie_tx)) {
dmaengine_terminate_async(to_sci_port(port)->chan_tx);
to_sci_port(port)->cookie_tx = -EINVAL;
}
#endif
}
static void sci_start_rx(struct uart_port *port)