From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Date: Wed, 6 Sep 2023 06:50:58 +0000 (+0300)
Subject: drm/bridge: tc358768: Fix tc358768_ns_to_cnt()
X-Git-Tag: v6.6.7~1386
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2755e3757585e8cf1b0a33267eab7519f1c307d8;p=platform%2Fkernel%2Flinux-starfive.git

drm/bridge: tc358768: Fix tc358768_ns_to_cnt()

[ Upstream commit f1dabbe645065d20ca863c8d446c74c59ca1ca9d ]

The tc358768_ns_to_cnt() is, most likely, supposed to do a div-round-up
operation, but it misses subtracting one from the dividend.

Fix this by just using DIV_ROUND_UP().

Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Tested-by: Maxim Schwalm <maxim.schwalm@gmail.com> # Asus TF700T
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230906-tc358768-v4-11-31725f008a50@ideasonboard.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index d1000d1f..6eed5c4 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -630,7 +630,7 @@ static int tc358768_setup_pll(struct tc358768_priv *priv,
 
 static u32 tc358768_ns_to_cnt(u32 ns, u32 period_ps)
 {
-	return (ns * 1000 + period_ps) / period_ps;
+	return DIV_ROUND_UP(ns * 1000, period_ps);
 }
 
 static u32 tc358768_ps_to_ns(u32 ps)