linux-kernel - [PATCH v5] media: saa7115: Replace open-coded parity calculation with parity8()

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Message-Id: <20250515081109.775227-1-visitorckw@gmail.com>
Date: Thu, 15 May 2025 16:11:09 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: mchehab@...nel.org
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jserv@...s.ncku.edu.tw,
	Kuan-Wei Chiu <visitorckw@...il.com>,
	Yu-Chun Lin <eleanor15x@...il.com>,
	Hans Verkuil <hverkuil@...all.nl>
Subject: [PATCH v5] media: saa7115: Replace open-coded parity calculation with parity8()

Refactor parity calculations to use the standard parity8() helper.
This change eliminates redundant implementations.

Co-developed-by: Yu-Chun Lin <eleanor15x@...il.com>
Signed-off-by: Yu-Chun Lin <eleanor15x@...il.com>
Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>
Reviewed-by: Hans Verkuil <hverkuil@...all.nl>
---
Changes in v5:
- Dropped changes to bitops.h
- Switched to using existing parity8()
- Split parity8() conversion patch out of the series

 drivers/media/i2c/saa7115.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/saa7115.c b/drivers/media/i2c/saa7115.c
index a1c71187e773..b8b8f206ec3a 100644
--- a/drivers/media/i2c/saa7115.c
+++ b/drivers/media/i2c/saa7115.c
@@ -25,6 +25,7 @@
 
 #include "saa711x_regs.h"
 
+#include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -664,15 +665,6 @@ static const unsigned char saa7115_init_misc[] = {
 	0x00, 0x00
 };
 
-static int saa711x_odd_parity(u8 c)
-{
-	c ^= (c >> 4);
-	c ^= (c >> 2);
-	c ^= (c >> 1);
-
-	return c & 1;
-}
-
 static int saa711x_decode_vps(u8 *dst, u8 *p)
 {
 	static const u8 biphase_tbl[] = {
@@ -1227,7 +1219,7 @@ static int saa711x_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vb
 		vbi->type = V4L2_SLICED_TELETEXT_B;
 		break;
 	case 4:
-		if (!saa711x_odd_parity(p[0]) || !saa711x_odd_parity(p[1]))
+		if (!parity8(p[0]) || !parity8(p[1]))
 			return 0;
 		vbi->type = V4L2_SLICED_CAPTION_525;
 		break;
-- 
2.34.1