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authorTero Kristo <t-kristo@ti.com>2020-09-07 11:57:40 +0300
committerStephen Boyd <sboyd@kernel.org>2020-09-22 12:58:52 -0700
commit4630ef134e41389a7170b05790c0ddcd88977b01 (patch)
treed812db563368295091401be1138463048ced1094 /drivers/clk
parentd3f3f499cb335eba84788a9456f7d6f92a069bbe (diff)
downloadlinux-4630ef134e41389a7170b05790c0ddcd88977b01.tar.bz2
clk: keystone: sci-clk: add 10% slack to set_rate
Currently, we request exact clock rates from the firmware to be set with set_rate. Due to some rounding errors and internal functionality of the firmware itself, this can fail. Thus, add some slack to the set_rate functionality so that we are always guaranteed to pass. The firmware always attempts to use frequency as close to the target freq as possible despite the slack given here. Signed-off-by: Tero Kristo <t-kristo@ti.com> Link: https://lore.kernel.org/r/20200907085740.1083-4-t-kristo@ti.com Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/keystone/sci-clk.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
index b6477b08af04..aaf31abe1c8f 100644
--- a/drivers/clk/keystone/sci-clk.c
+++ b/drivers/clk/keystone/sci-clk.c
@@ -221,7 +221,8 @@ static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate,
struct sci_clk *clk = to_sci_clk(hw);
return clk->provider->ops->set_freq(clk->provider->sci, clk->dev_id,
- clk->clk_id, rate, rate, rate);
+ clk->clk_id, rate / 10 * 9, rate,
+ rate / 10 * 11);
}
/**