linux-kernel - [PATCH v5] media: pci: cx18-av-vbi: Replace open-coded parity calculation with parity8()

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Message-Id: <20250515080933.774874-1-visitorckw@gmail.com>
Date: Thu, 15 May 2025 16:09:33 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: awalls@...metrocast.net,
	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: pci: cx18-av-vbi: 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/pci/cx18/cx18-av-vbi.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/media/pci/cx18/cx18-av-vbi.c b/drivers/media/pci/cx18/cx18-av-vbi.c
index 65281d40c681..1a113aad9cd4 100644
--- a/drivers/media/pci/cx18/cx18-av-vbi.c
+++ b/drivers/media/pci/cx18/cx18-av-vbi.c
@@ -8,6 +8,7 @@
  */
 
 
+#include <linux/bitops.h>
 #include "cx18-driver.h"
 
 /*
@@ -56,15 +57,6 @@ struct vbi_anc_data {
 	/* u8 fill[]; Variable number of fill bytes */
 };
 
-static int odd_parity(u8 c)
-{
-	c ^= (c >> 4);
-	c ^= (c >> 2);
-	c ^= (c >> 1);
-
-	return c & 1;
-}
-
 static int decode_vps(u8 *dst, u8 *p)
 {
 	static const u8 biphase_tbl[] = {
@@ -278,7 +270,7 @@ int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
 		break;
 	case 6:
 		sdid = V4L2_SLICED_CAPTION_525;
-		err = !odd_parity(p[0]) || !odd_parity(p[1]);
+		err = !parity8(p[0]) || !parity8(p[1]);
 		break;
 	case 9:
 		sdid = V4L2_SLICED_VPS;
-- 
2.34.1