From: Tero Kristo Date: Mon, 7 Sep 2020 08:57:40 +0000 (+0300) Subject: clk: keystone: sci-clk: add 10% slack to set_rate X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4630ef134e41389a7170b05790c0ddcd88977b01;p=linux.git 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 Link: https://lore.kernel.org/r/20200907085740.1083-4-t-kristo@ti.com Acked-by: Santosh Shilimkar Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c index b6477b08af04b..aaf31abe1c8ff 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); } /**