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Subject[PATCH] clk: sunxi: Fix M factor computation for APB1
Date
commit cfa636886033 ("clk: sunxi: factors: Consolidate get_factors
parameters into a struct") introduced a regression for m factor
computation in sun4i_get_apb1_factors function.

The old code reassigned the "parent_rate" parameter to the targeted
divisor value and was buggy for the returned frequency but not for the
computed factors. Now, returned frequency is good but m factor is
incorrectly computed (its max value 31 is always set resulting in a
significantly slower frequency than the requested one...)

This patch simply restores the original proper computation for m while
keeping the good changes for returned rate.

Signed-off-by: Stéphan Rafin <stephan@soliotek.com>
---
drivers/clk/sunxi/clk-sunxi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 838b22a..f2c9274 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -373,7 +373,7 @@ static void sun4i_get_apb1_factors(struct factors_request *req)
else
calcp = 3;

- calcm = (req->parent_rate >> calcp) - 1;
+ calcm = (div >> calcp) - 1;

req->rate = (req->parent_rate >> calcp) / (calcm + 1);
req->m = calcm;
--
2.6.6
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