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serial: sprd: Add clearing break interrupt operation 

commit abeb2e9414 upstream.

A break interrupt will be generated if the RX line was pulled low, which
means some abnomal behaviors occurred of the UART. In this case, we still
need to clear this break interrupt status, otherwise it will cause irq
storm to crash the whole system.

Fixes: b7396a38fb ("tty/serial: Add Spreadtrum sc9836-uart driver support")
Signed-off-by: Yonghan Ye <yonghan.ye@unisoc.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/925e51b73099c90158e080b8f5bed9b3b38c4548.1575460601.git.baolin.wang7@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yonghan Ye 2019-12-04 20:00:07 +08:00 committed by Greg Kroah-Hartman
parent 3a2f322a2b
commit f960c6dafc
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/sprd_serial.c
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@ -679,6 +679,9 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
if (ims & SPRD_IMSR_TIMEOUT)
serial_out(port, SPRD_ICLR, SPRD_ICLR_TIMEOUT);
if (ims & SPRD_IMSR_BREAK_DETECT)
serial_out(port, SPRD_ICLR, SPRD_IMSR_BREAK_DETECT);
if (ims & (SPRD_IMSR_RX_FIFO_FULL | SPRD_IMSR_BREAK_DETECT |
SPRD_IMSR_TIMEOUT))
sprd_rx(port);