OERV-BSP/kernel-spacemit-k1
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k1: uart: fix DCTS state read turn

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The func updates DCTS state in do-while.The last value of status
must be 0 so the func will return.We fix it.

Change-Id: Ie799c277cb46b6f8c6dda96c19181ed9ea66b617
Signed-off-by: yanhaodong <haodong.yan@spacemit.com>
This commit is contained in:
yanhaodong
2025-06-25 10:31:49 +08:00
parent 7be6c98c18
commit fc2b447e45
1 changed files with 17 additions and 5 deletions
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22
drivers/tty/serial/pxa_k1x.c
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@@ -518,11 +518,7 @@ static inline void check_modem_status(struct uart_pxa_port *up)
{
int status, dcts = 0;
do {
status = serial_in(up, UART_MSR);
if (status & UART_MSR_DCTS)
dcts = 1;
} while ((status & UART_MSR_DCTS) != 0);
status = serial_in(up, UART_MSR);
if ((status & UART_MSR_ANY_DELTA) == 0)
return;
@@ -534,8 +530,24 @@ static inline void check_modem_status(struct uart_pxa_port *up)
up->port.icount.dsr++;
if (status & UART_MSR_DDCD)
uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
#if CONFIG_SOC_SPACEMIT_K1X
do {
if (status & UART_MSR_DCTS)
dcts = 1;
status = serial_in(up, UART_MSR);
if (status & UART_MSR_TERI)
up->port.icount.rng++;
if (status & UART_MSR_DDSR)
up->port.icount.dsr++;
if (status & UART_MSR_DDCD)
uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
} while ((status & UART_MSR_DCTS) != 0);
if (dcts)
uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
#else
if (status & UART_MSR_DCTS)
uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
#endif
spin_unlock(&up->port.lock);
wake_up_interruptible(&up->port.state->port.delta_msr_wait);