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clk: keystone: sci-clk: add 10% slack to set_rate

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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>
This commit is contained in:
Tero Kristo 2020-09-07 11:57:40 +03:00 committed by Stephen Boyd
parent d3f3f499cb
commit 4630ef134e
1 changed files with 2 additions and 1 deletions
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3
drivers/clk/keystone/sci-clk.c
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@ -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);
}
/**