From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> stable inclusion from stable-v6.6.2 commit 2755e3757585e8cf1b0a33267eab7519f1c307d8 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ 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-v4-11-31725f... Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/gpu/drm/bridge/tc358768.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c index d1000d1f69f4..6eed5c423295 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) -- 2.25.1