clk: at91: clk-master: fix prescaler logic

[ Upstream commit 0ef99f8202c5078a72c05af76bfaed2ea4daab19 ]

When prescaler value read from register is MASTER_PRES_MAX it means
that the input clock will be divided by 3. Fix the code to reflect
this.

Fixes: 7a110b9107ed8 ("clk: at91: clk-master: re-factor master clock")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-11-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 2e41081..04d0dd8 100644 (file)
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -309,7 +309,7 @@ static unsigned long clk_master_pres_recalc_rate(struct clk_hw *hw,
        spin_unlock_irqrestore(master->lock, flags);
 
        pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
-       if (pres == 3 && characteristics->have_div3_pres)
+       if (pres == MASTER_PRES_MAX && characteristics->have_div3_pres)
                pres = 3;
        else
                pres = (1 << pres);