openwrt/target/linux/d1/patches-6.1/0002-clk-sunxi-ng-mp-Avoid-computing-the-rate-twice.patch

From 74492b9ecd874496578693d9985649665b560308 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel@sholland.org>
Date: Sun, 7 Aug 2022 20:08:49 -0500
Subject: [PATCH 002/117] clk: sunxi-ng: mp: Avoid computing the rate twice

ccu_mp_find_best() already computes a best_rate at the same time as the
best m and p factors. Return it so the caller does not need to duplicate
the division.

Series-to: Chen-Yu Tsai <wens@csie.org>
Series-to: Jernej Skrabec <jernej.skrabec@gmail.com>

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/clk/sunxi-ng/ccu_mp.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/clk/sunxi-ng/ccu_mp.c
+++ b/drivers/clk/sunxi-ng/ccu_mp.c
@@ -10,9 +10,9 @@
 #include "ccu_gate.h"
 #include "ccu_mp.h"
 
-static void ccu_mp_find_best(unsigned long parent, unsigned long rate,
-			     unsigned int max_m, unsigned int max_p,
-			     unsigned int *m, unsigned int *p)
+static unsigned long ccu_mp_find_best(unsigned long parent, unsigned long rate,
+				      unsigned int max_m, unsigned int max_p,
+				      unsigned int *m, unsigned int *p)
 {
 	unsigned long best_rate = 0;
 	unsigned int best_m = 0, best_p = 0;
@@ -35,6 +35,8 @@ static void ccu_mp_find_best(unsigned lo
 
 	*m = best_m;
 	*p = best_p;
+
+	return best_rate;
 }
 
 static unsigned long ccu_mp_find_best_with_parent_adj(struct clk_hw *hw,
@@ -109,8 +111,7 @@ static unsigned long ccu_mp_round_rate(s
 	max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1);
 
 	if (!clk_hw_can_set_rate_parent(&cmp->common.hw)) {
-		ccu_mp_find_best(*parent_rate, rate, max_m, max_p, &m, &p);
-		rate = *parent_rate / p / m;
+		rate = ccu_mp_find_best(*parent_rate, rate, max_m, max_p, &m, &p);
 	} else {
 		rate = ccu_mp_find_best_with_parent_adj(hw, parent_rate, rate,
 							max_m, max_p);