clk: sunxi-ng: mp: Fix dual-divider clock rate readback

When dual-divider clock support was introduced, the P divider offset was
left out of the .recalc_rate readback function. This causes the clock
rate to become bogus or even zero (possibly due to the P divider being
1, leading to a divide-by-zero).

Fix this by incorporating the P divider offset into the calculation.

Fixes: 4571780 ("clk: sunxi-ng: mp: introduce dual-divider clock")
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://patch.msgid.link/20250830170901.1996227-4-wens@kernel.org
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Author: wens

drivers/clk/sunxi-ng/ccu_mp.c

@@ -185,7 +185,7 @@ static unsigned long ccu_mp_recalc_rate(struct clk_hw *hw,
 	p &= (1 << cmp->p.width) - 1;
 
 	if (cmp->common.features & CCU_FEATURE_DUAL_DIV)
-		rate = (parent_rate / p) / m;
+		rate = (parent_rate / (p + cmp->p.offset)) / m;
 	else
 		rate = (parent_rate >> p) / m;