From: Maxime Ripard Date: Wed, 22 Sep 2021 12:54:15 +0000 (+0200) Subject: clk: bcm-2835: Pick the closest clock rate X-Git-Tag: accepted/tizen/unified/20230118.172025~3625 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2ff7b32f6b3efbf021c151c01208386e62618aac;p=platform%2Fkernel%2Flinux-rpi.git clk: bcm-2835: Pick the closest clock rate [ Upstream commit 5517357a4733d7cf7c17fc79d0530cfa47add372 ] The driver currently tries to pick the closest rate that is lower than the rate being requested. This causes an issue with clk_set_min_rate() since it actively checks for the rounded rate to be above the minimum that was just set. Let's change the logic a bit to pick the closest rate to the requested rate, no matter if it's actually higher or lower. Fixes: 6d18b8adbe67 ("clk: bcm2835: Support for clock parent selection") Signed-off-by: Maxime Ripard Acked-by: Stephen Boyd Reviewed-by: Nicolas Saenz Julienne Tested-by: Nicolas Saenz Julienne # boot and basic functionality Tested-by: Michael Stapelberg Link: https://patchwork.freedesktop.org/patch/msgid/20210922125419.4125779-2-maxime@cerno.tech Signed-off-by: Sasha Levin --- diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index a254512..bf97b2b 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -1216,7 +1216,7 @@ static int bcm2835_clock_determine_rate(struct clk_hw *hw, rate = bcm2835_clock_choose_div_and_prate(hw, i, req->rate, &div, &prate, &avgrate); - if (rate > best_rate && rate <= req->rate) { + if (abs(req->rate - rate) < abs(req->rate - best_rate)) { best_parent = parent; best_prate = prate; best_rate = rate;