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authorChao Xie <chao.xie@marvell.com>2014-01-23 10:47:42 +0800
committerMike Turquette <mturquette@linaro.org>2014-03-26 20:59:27 -0700
commit5d26c15d3ba98c31b24286dac7a390a307fcff29 (patch)
tree32dadeb1f46b6bb918edf3b32960f64201e1742e /drivers/clk
parentc45693a6480cee906557a9fba533a9f3c224f91e (diff)
downloadlinux-5d26c15d3ba98c31b24286dac7a390a307fcff29.tar.bz2
clk: mmp: try to use closer one when do round rate
The orignal code will use the bigger rate between "previous rate" and "current rate" when caculate the rate. In fact, hardware cares about the closest one. So choose the closer rate between "previous rate" and "current rate". Signed-off-by: Chao Xie <chao.xie@marvell.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/mmp/clk-frac.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/clk/mmp/clk-frac.c b/drivers/clk/mmp/clk-frac.c
index 5863a37ec84d..23a56f561812 100644
--- a/drivers/clk/mmp/clk-frac.c
+++ b/drivers/clk/mmp/clk-frac.c
@@ -45,10 +45,14 @@ static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
if (rate > drate)
break;
}
- if ((i == 0) || (i == factor->ftbl_cnt))
+ if ((i == 0) || (i == factor->ftbl_cnt)) {
return rate;
- else
- return prev_rate;
+ } else {
+ if ((drate - prev_rate) > (rate - drate))
+ return rate;
+ else
+ return prev_rate;
+ }
}
static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,