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authorBoris Brezillon <boris.brezillon@free-electrons.com>2015-03-28 01:53:15 +0300
committerBoris Brezillon <boris.brezillon@free-electrons.com>2015-06-19 15:43:39 +0300
commit6c7b03e1aef2e92176435f4fa562cc483422d20f (patch)
tree5630b97e175b6b789e152e43591388b2346ed973 /drivers
parent03bc10ab5b0f9b8f81bffbe6e40c944f9d3dbcc5 (diff)
downloadlinux-6c7b03e1aef2e92176435f4fa562cc483422d20f.tar.xz
clk: at91: pll: fix input range validity check
The PLL impose a certain input range to work correctly, but it appears that this input range does not apply on the input clock (or parent clock) but on the input clock after it has passed the PLL divisor. Fix the implementation accordingly. Cc: <stable@vger.kernel.org> # v3.14+ Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Reported-by: Jonas Andersson <jonas@microbit.se>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/at91/clk-pll.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/clk/at91/clk-pll.c b/drivers/clk/at91/clk-pll.c
index 6ec79dbc0840..cbbe40377ad6 100644
--- a/drivers/clk/at91/clk-pll.c
+++ b/drivers/clk/at91/clk-pll.c
@@ -173,8 +173,7 @@ static long clk_pll_get_best_div_mul(struct clk_pll *pll, unsigned long rate,
int i = 0;
/* Check if parent_rate is a valid input rate */
- if (parent_rate < characteristics->input.min ||
- parent_rate > characteristics->input.max)
+ if (parent_rate < characteristics->input.min)
return -ERANGE;
/*
@@ -187,6 +186,15 @@ static long clk_pll_get_best_div_mul(struct clk_pll *pll, unsigned long rate,
if (!mindiv)
mindiv = 1;
+ if (parent_rate > characteristics->input.max) {
+ tmpdiv = DIV_ROUND_UP(parent_rate, characteristics->input.max);
+ if (tmpdiv > PLL_DIV_MAX)
+ return -ERANGE;
+
+ if (tmpdiv > mindiv)
+ mindiv = tmpdiv;
+ }
+
/*
* Calculate the maximum divider which is limited by PLL register
* layout (limited by the MUL or DIV field size).