Commit 8c7aa632 authored by Quentin Schulz's avatar Quentin Schulz Committed by Stephen Boyd

clk: at91: clk-generated: remove useless divisor loop

The driver requests the current clk rate of each of its parent clocks to
decide whether a clock rate is suitable or not. It does not request
determine_rate from a parent clock which could request a rate change in
parent clock (i.e. there is no parent rate propagation).

We know the rate we want (passed along req argument of the function) and
the parent clock rate, thus we know the closest rounded divisor, we
don't need to iterate over the available divisors to find the best one
for a given clock.
Signed-off-by: default avatarQuentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 8bb48f79
...@@ -124,19 +124,18 @@ static int clk_generated_determine_rate(struct clk_hw *hw, ...@@ -124,19 +124,18 @@ static int clk_generated_determine_rate(struct clk_hw *hw,
(gck->range.max && min_rate > gck->range.max)) (gck->range.max && min_rate > gck->range.max))
continue; continue;
for (div = 1; div < GENERATED_MAX_DIV + 2; div++) { div = DIV_ROUND_CLOSEST(parent_rate, req->rate);
tmp_rate = DIV_ROUND_CLOSEST(parent_rate, div); if (!div)
tmp_diff = abs(req->rate - tmp_rate); tmp_rate = parent_rate;
else
if (best_diff < 0 || best_diff > tmp_diff) { tmp_rate = parent_rate / div;
best_rate = tmp_rate; tmp_diff = abs(req->rate - tmp_rate);
best_diff = tmp_diff;
req->best_parent_rate = parent_rate; if (best_diff < 0 || best_diff > tmp_diff) {
req->best_parent_hw = parent; best_rate = tmp_rate;
} best_diff = tmp_diff;
req->best_parent_rate = parent_rate;
if (!best_diff || tmp_rate < req->rate) req->best_parent_hw = parent;
break;
} }
if (!best_diff) if (!best_diff)
......
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