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serial: 8250: add line error log

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Change-Id: I69fe6f0c0857ade25e777be388fcab6261f1a533
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
This commit is contained in:
Huibin Hong 2018-09-12 16:24:05 +08:00 committed by Tao Huang
parent 3accb95349
commit d20b0acc4a
1 changed files with 18 additions and 1 deletions
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19
drivers/tty/serial/8250/8250_port.c
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@ -1551,7 +1551,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
unsigned char status;
unsigned long flags;
struct uart_8250_port *up = up_to_u8250p(port);
int dma_err = 0;
int dma_err = 0, idx;
if (iir & UART_IIR_NO_INT)
return 0;
@ -1573,7 +1573,24 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
if ((!up->dma || (up->dma && up->dma->tx_err)) &&
(status & UART_LSR_THRE))
serial8250_tx_chars(up);
#ifdef CONFIG_ARCH_ROCKCHIP
if (status & UART_LSR_BRK_ERROR_BITS) {
idx = serial_index(port);
if (status & UART_LSR_OE)
pr_err("ttyS%d: Overrun error!\n", idx);
if (status & UART_LSR_PE)
pr_err("ttyS%d: Parity error!\n", idx);
if (status & UART_LSR_FE)
pr_err("ttyS%d: Frame error!\n", idx);
if (status & UART_LSR_BI)
pr_err("ttyS%d: Break interrupt!\n", idx);
pr_err("ttyS%d: maybe rx pin is low or baudrate is not correct!\n",
idx);
}
#endif
spin_unlock_irqrestore(&port->lock, flags);
return 1;
}