linux-kernel - [PATCH v3 2/4] mxs-auart: redefine AUART_LINECTRL

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Date:   Thu, 10 Jun 2021 11:02:45 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH v3 2/4] mxs-auart: redefine AUART_LINECTRL_WLEN to accept bits count

It's a bit illogical to take magic constants in AUART_LINECTRL_WLEN.
Like in auart_console_get_options(), 2 means 7 bits. Switch
AUART_LINECTRL_WLEN to accept bit length, i.e. let it subtract 5 from
the parameter before doing the logic.

This will ease conversion from CSIZE to bits in mxs_auart_settermios()
in the next patch.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/serial/mxs-auart.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index f414d6acad69..7b4b6bb75424 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -87,7 +87,7 @@
 #define AUART_LINECTRL_BAUD_DIVFRAC(v)		(((v) & 0x3f) << 8)
 #define AUART_LINECTRL_SPS			(1 << 7)
 #define AUART_LINECTRL_WLEN_MASK		0x00000060
-#define AUART_LINECTRL_WLEN(v)			(((v) & 0x3) << 5)
+#define AUART_LINECTRL_WLEN(v)			((((v) - 5) & 0x3) << 5)
 #define AUART_LINECTRL_FEN			(1 << 4)
 #define AUART_LINECTRL_STP2			(1 << 3)
 #define AUART_LINECTRL_EPS			(1 << 2)
@@ -973,16 +973,16 @@ static void mxs_auart_settermios(struct uart_port *u,
 	/* byte size */
 	switch (cflag & CSIZE) {
 	case CS5:
-		bm = 0;
+		bm = 5;
 		break;
 	case CS6:
-		bm = 1;
+		bm = 6;
 		break;
 	case CS7:
-		bm = 2;
+		bm = 7;
 		break;
 	case CS8:
-		bm = 3;
+		bm = 8;
 		break;
 	default:
 		return;
@@ -1403,7 +1403,7 @@ auart_console_get_options(struct mxs_auart_port *s, int *baud,
 			*parity = 'o';
 	}
 
-	if ((lcr_h & AUART_LINECTRL_WLEN_MASK) == AUART_LINECTRL_WLEN(2))
+	if ((lcr_h & AUART_LINECTRL_WLEN_MASK) == AUART_LINECTRL_WLEN(7))
 		*bits = 7;
 	else
 		*bits = 8;
-- 
2.32.0