linux-kernel - [PATCH 03/14] drm/tidss: dispc: Switch to FIELD_PREP for FLD

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Message-Id: <20250730-drm-tidss-field-api-v1-3-a71ae8dd2782@kernel.org>
Date: Wed, 30 Jul 2025 10:57:03 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Jyri Sarha <jyri.sarha@....fi>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 03/14] drm/tidss: dispc: Switch to FIELD_PREP for FLD_VAL

The FLD_VAL function in the dispc driver hand-rolls what the FIELD_PREP
macro provides. Let's switch to the latter.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/tidss/tidss_dispc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 5a0904acbed279506df2edad559dfe06f25cd7b5..7e36f5af666342dc4f5fa9159d829d88362de18c 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -609,11 +609,11 @@ void tidss_disable_oldi(struct tidss_device *tidss, u32 hw_videoport)
  * number. For example 7:0
  */
 
 static u32 FLD_VAL(u32 val, u32 start, u32 end)
 {
-	return (val << end) & GENMASK(start, end);
+	return FIELD_PREP(GENMASK(start, end), val);
 }
 
 static u32 FLD_GET(u32 val, u32 start, u32 end)
 {
 	return (val & GENMASK(start, end)) >> end;

-- 
2.50.1