linux-kernel - [PATCH 3/3] serial: 8250_mtk: Fix register address for XON/XOFF character

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Date:   Wed, 27 Apr 2022 15:23:28 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     gregkh@...uxfoundation.org
Cc:     jirislaby@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, zhiyong.tao@...iatek.com,
        colin.king@...el.com, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] serial: 8250_mtk: Fix register address for XON/XOFF character

The XON1/XOFF1 character registers are at offset 0xa0 and 0xa8
respectively, so we cannot use the definition in serial_port.h.

Fixes: bdbd0a7f8f03 ("serial: 8250-mtk: modify baudrate setting")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/tty/serial/8250/8250_mtk.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 28e36459642c..21053db93ff1 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -57,6 +57,9 @@
 #define MTK_UART_FEATURE_SEL	39	/* Feature Selection register */
 #define MTK_UART_FEAT_NEWRMAP	BIT(0)	/* Use new register map */
 
+#define MTK_UART_XON1		40	/* I/O: Xon character 1 */
+#define MTK_UART_XOFF1		42	/* I/O: Xoff character 1 */
+
 #ifdef CONFIG_SERIAL_8250_DMA
 enum dma_rx_status {
 	DMA_RX_START = 0,
@@ -278,8 +281,8 @@ static void mtk8250_set_flow_ctrl(struct uart_8250_port *up, int mode)
 			(serial_in(up, MTK_UART_EFR) &
 			(~(MTK_UART_EFR_HW_FC | MTK_UART_EFR_SW_FC_MASK))));
 
-		serial_out(up, UART_XON1, START_CHAR(port->state->port.tty));
-		serial_out(up, UART_XOFF1, STOP_CHAR(port->state->port.tty));
+		serial_out(up, MTK_UART_XON1, START_CHAR(port->state->port.tty));
+		serial_out(up, MTK_UART_XOFF1, STOP_CHAR(port->state->port.tty));
 		serial_out(up, UART_LCR, lcr);
 		mtk8250_disable_intrs(up, MTK_UART_IER_CTSI|MTK_UART_IER_RTSI);
 		mtk8250_enable_intrs(up, MTK_UART_IER_XOFFI);
-- 
2.35.1