linux-kernel - [PATCH 2/6] serial: 8250: Name MSR literals

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Message-Id: <20221124125948.23432-3-ilpo.jarvinen@linux.intel.com>
Date:   Thu, 24 Nov 2022 14:59:44 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 2/6] serial: 8250: Name MSR literals

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@...ux.intel.com>
---
 drivers/tty/serial/8250/8250_port.c | 4 ++--
 include/linux/serial.h              | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 8676f8b7f2e3..c870ee8e80b6 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -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);
diff --git a/include/linux/serial.h b/include/linux/serial.h
index ad6e1c37e2d5..bfda927dde15 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -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
  */
-- 
2.30.2