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clk: bcm-2835: Pick the closest clock rate

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[ 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 <maxime@cerno.tech>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Tested-by: Nicolas Saenz Julienne <nsaenz@kernel.org> # boot and basic functionality
Tested-by: Michael Stapelberg <michael@stapelberg.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210922125419.4125779-2-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2021-09-22 14:54:15 +02:00 committed by Greg Kroah-Hartman
parent d2e7a4d20f
commit 2ff7b32f6b
1 changed files with 1 additions and 1 deletions
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2
drivers/clk/bcm/clk-bcm2835.c
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@ -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;