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serial: 8250_dw: clear time out interrupt when in dma mode

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Change-Id: Iebeacce7cea7be8a71ae0dad17db5bcdeb26d52a
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
This commit is contained in:
Huibin Hong
2017-12-28 16:12:21 +08:00
committed by Tao Huang
parent 584044d78b
commit b2aec6e19d
1 changed files with 1 additions and 5 deletions
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6
drivers/tty/serial/8250/8250_dw.c
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@@ -255,7 +255,6 @@ static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset)
static int dw8250_handle_irq(struct uart_port *p)
{
struct uart_8250_port *up = up_to_u8250p(p);
struct dw8250_data *d = p->private_data;
unsigned int iir = p->serial_in(p, UART_IIR);
unsigned int status;
@@ -267,11 +266,8 @@ static int dw8250_handle_irq(struct uart_port *p)
* data available. If we see such a case then we'll do a bogus
* read. If we don't do this then the "RX TIMEOUT" interrupt will
* fire forever.
*
* This problem has only been observed so far when not in DMA mode
* so we limit the workaround only to non-DMA mode.
*/
if (!up->dma && ((iir & 0x3f) == UART_IIR_RX_TIMEOUT)) {
if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT) {
spin_lock_irqsave(&p->lock, flags);
status = p->serial_in(p, UART_LSR);