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serial: sh-sci: Stop dmaengine transfer in sci_stop_tx()
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>
This commit is contained in:
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1 changed files with 8 additions and 0 deletions
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@ -611,6 +611,14 @@ static void sci_stop_tx(struct uart_port *port)
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ctrl &= ~SCSCR_TIE;
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serial_port_out(port, SCSCR, ctrl);
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#ifdef CONFIG_SERIAL_SH_SCI_DMA
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if (to_sci_port(port)->chan_tx &&
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!dma_submit_error(to_sci_port(port)->cookie_tx)) {
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dmaengine_terminate_async(to_sci_port(port)->chan_tx);
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to_sci_port(port)->cookie_tx = -EINVAL;
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}
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#endif
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}
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static void sci_start_rx(struct uart_port *port)
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