linux-kernel - [PATCH] clk: bcm2835: fix bcm2835_clock_choose

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Message-Id: <20220428183010.1635248-1-stefan.wahren@i2se.com>
Date:   Thu, 28 Apr 2022 20:30:10 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        Maxime Ripard <maxime@...no.tech>, linux-clk@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH] clk: bcm2835: fix bcm2835_clock_choose_div

The commit 09e3b18ca5de ("clk: bcm2835: Remove unused variable")
accidentially breaks the behavior of bcm2835_clock_choose_div() and
booting of Raspberry Pi. The removed do_div macro call had side effects,
so we need to restore it.

Fixes: 09e3b18ca5de ("clk: bcm2835: Remove unused variable")
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
---
 drivers/clk/bcm/clk-bcm2835.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 3ad20e75fd23..48a1eb9f2d55 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -941,6 +941,7 @@ static u32 bcm2835_clock_choose_div(struct clk_hw *hw,
 	u64 temp = (u64)parent_rate << CM_DIV_FRAC_BITS;
 	u32 div, mindiv, maxdiv;
 
+	do_div(temp, rate);
 	div = temp;
 	div &= ~unused_frac_mask;
 
-- 
2.25.1