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serial: 8250: Name MSR literals

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Add UART_MSR_STATUS_BITS for CD, RI, DSR & CTS. Use names for the
literal.

Don't make the define for combined flags part of UAPI.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20221125130509.8482-3-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-11-25 15:05:05 +02:00 committed by Greg Kroah-Hartman
parent ef460db2a7
commit d9c1d3cbde
2 changed files with 7 additions and 2 deletions
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4
drivers/tty/serial/8250/8250_port.c
View File

@ -1268,9 +1268,9 @@ static void autoconfig(struct uart_8250_port *up)
*/
if (!(port->flags & UPF_SKIP_TEST)) {
serial8250_out_MCR(up, UART_MCR_LOOP | 0x0A);
status1 = serial_in(up, UART_MSR) & 0xF0;
status1 = serial_in(up, UART_MSR) & UART_MSR_STATUS_BITS;
serial8250_out_MCR(up, save_mcr);
if (status1 != 0x90) {
if (status1 != (UART_MSR_DCD | UART_MSR_CTS)) {
spin_unlock_irqrestore(&port->lock, flags);
DEBUG_AUTOCONF("LOOP test failed (%02x) ",
status1);

5
include/linux/serial.h
View File

@ -28,6 +28,11 @@ static inline bool uart_lsr_tx_empty(u16 lsr)
return (lsr & UART_LSR_BOTH_EMPTY) == UART_LSR_BOTH_EMPTY;
}
#define UART_MSR_STATUS_BITS (UART_MSR_DCD | \
UART_MSR_RI | \
UART_MSR_DSR | \
UART_MSR_CTS)
/*
* Counters of the input lines (CTS, DSR, RI, CD) interrupts
*/