linux-kernel - [PATCH v6 11/11] clk: sunxi-ng: nkm: Prefer current parent rate

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Message-Id: <20230807-pll-mipi_set_rate_parent-v6-11-f173239a4b59@oltmanns.dev>
Date:   Mon, 07 Aug 2023 14:43:44 +0200
From:   Frank Oltmanns <frank@...manns.dev>
To:     Maxime Ripard <mripard@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Andre Przywara <andre.przywara@....com>,
        Roman Beranek <me@...y.cz>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH v6 11/11] clk: sunxi-ng: nkm: Prefer current parent rate

Similar to ccu_mp, if the current parent rate allows getting the ideal
rate, prefer to not change the parent clock's rate.

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Frank Oltmanns <frank@...manns.dev>
---
 drivers/clk/sunxi-ng/ccu_nkm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index a714dcf0dfc1..eed64547ad42 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -34,7 +34,8 @@ static unsigned long ccu_nkm_find_best_with_parent_adj(struct ccu_common *common
 
 				tmp_rate = tmp_parent * _n * _k / _m;
 
-				if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) {
+				if (ccu_is_better_rate(common, rate, tmp_rate, best_rate) ||
+				    (tmp_parent == *parent && tmp_rate == best_rate)) {
 					best_rate = tmp_rate;
 					best_parent_rate = tmp_parent;
 					best_n = _n;

-- 
2.41.0