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 5fd8959..8429b65 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -631,7 +631,7 @@ 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)