[PATCH 07/22] clk: sunxi: Fix PLL6 calculation on sun6i

Chen-Yu Tsai
2014-05-23T08:29:17Z

The N factor for PLL6 counts from 1 to 32, as specified in the A23
manual, and shown in Allwinner's original code.

This patch fixes the N factor in the clock driver, as well as the
comment describing it.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
drivers/clk/sunxi/clk-sunxi.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index b2c6d12..6500a1b 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -198,7 +198,7 @@ static void sun4i_get_pll5_factors(u32 *freq, u32 parent_rate,
/**
* sun6i_a31_get_pll6_factors() - calculates n, k factors for A31 PLL6
* PLL6 rate is calculated as follows
- * rate = parent_rate * n * (k + 1) / 2
+ * rate = parent_rate * (n + 1) * (k + 1) / 2
* parent_rate is always 24Mhz
*/

@@ -225,7 +225,7 @@ static void sun6i_a31_get_pll6_factors(u32 *freq, u32 parent_rate,
if (*k > 3)
*k = 3;

- *n = DIV_ROUND_UP(div, (*k+1));
+ *n = DIV_ROUND_UP(div, (*k+1)) - 1;
}

/**
@@ -434,6 +434,7 @@ static struct clk_factors_config sun6i_a31_pll6_config = {
.nwidth = 5,
.kshift = 4,
.kwidth = 2,
+ .n_from_one = 1,
};

static struct clk_factors_config sun4i_apb1_config = {
--
2.0.0.rc2