clk: bcm2835: fix bcm2835_clock_choose_div

The commit 09e3b18 ("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: 09e3b18 ("clk: bcm2835: Remove unused variable")
Signed-off-by: Stefan Wahren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Maxime Ripard <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: lategoodbye

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;