linux-kernel - [PATCH v2 04/20] media: synopsys: hdmirx: replace macros with bitfield variants

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Message-Id: <20250623-byeword-update-v2-4-cf1fc08a2e1f@collabora.com>
Date: Mon, 23 Jun 2025 18:05:32 +0200
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Yury Norov <yury.norov@...il.com>, 
 Rasmus Villemoes <linux@...musvillemoes.dk>, 
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Cc: kernel@...labora.com, linux-kernel@...r.kernel.org, 
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 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH v2 04/20] media: synopsys: hdmirx: replace macros with
 bitfield variants

The era of hand-rolled HIWORD_UPDATE macros is over, at least for those
drivers that use constant masks.

Replace the UPDATE macro with bitfield.h's FIELD_PREP, to give us
additional error checking.

Also, replace the HIWORD_UPDATE macro at the same time with the new
FIELD_PREP_WM16 macro in hw_bitfield.h, which also gives us additional
error checking.

The UPDATE/HIWORD_UPDATE macros are left as wrappers around the
replacement macros, in order to not rock the boat too much, and keep the
changes easy to review.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/media/platform/synopsys/hdmirx/snps_hdmirx.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/synopsys/hdmirx/snps_hdmirx.h b/drivers/media/platform/synopsys/hdmirx/snps_hdmirx.h
index 220ab99ca61152b36b0a08b398ddefdb985709a5..b26668a98aafd1682b8342cc11f84666a13f07a3 100644
--- a/drivers/media/platform/synopsys/hdmirx/snps_hdmirx.h
+++ b/drivers/media/platform/synopsys/hdmirx/snps_hdmirx.h
@@ -8,10 +8,12 @@
 #ifndef DW_HDMIRX_H
 #define DW_HDMIRX_H

+#include <linux/bitfield.h>
 #include <linux/bitops.h>
+#include <linux/hw_bitfield.h>

-#define UPDATE(x, h, l)		(((x) << (l)) & GENMASK((h), (l)))
-#define HIWORD_UPDATE(v, h, l)	(((v) << (l)) | (GENMASK((h), (l)) << 16))
+#define UPDATE(x, h, l)		(FIELD_PREP(GENMASK((h), (l)), (x)))
+#define HIWORD_UPDATE(v, h, l)	(FIELD_PREP_WM16(GENMASK((h), (l)), (v)))

 /* SYS_GRF */
 #define SYS_GRF_SOC_CON1			0x0304

-- 
2.50.0