diff options
author | Boris BREZILLON <b.brezillon@overkiz.com> | 2014-03-11 10:00:32 +0100 |
---|---|---|
committer | Mike Turquette <mturquette@linaro.org> | 2014-03-19 15:21:39 -0700 |
commit | 419f612932674d5f72b1995eda52ca15d87361ef (patch) | |
tree | 21b9bf077747370798922dbffaeb2662c4426d3e /drivers | |
parent | 843bad8361bb0d7e5ed6254c84abd8d2ec61b6a4 (diff) |
clk: at91: replace prog clk round_rate with determine_rate
Implement the determine_rate callback to choose the best parent clk that
fulfills the requested rate.
Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/clk/at91/clk-programmable.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c index fd792b203eaf..eff701665f04 100644 --- a/drivers/clk/at91/clk-programmable.c +++ b/drivers/clk/at91/clk-programmable.c @@ -102,40 +102,40 @@ static unsigned long clk_programmable_recalc_rate(struct clk_hw *hw, return parent_rate >> prog->pres; } -static long clk_programmable_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *parent_rate) +static long clk_programmable_determine_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long *best_parent_rate, + struct clk **best_parent_clk) { - unsigned long best_rate = *parent_rate; - unsigned long best_diff; - unsigned long new_diff; - unsigned long cur_rate; - int shift = shift; - - if (rate > *parent_rate) - return *parent_rate; - else - best_diff = *parent_rate - rate; - - if (!best_diff) - return best_rate; + struct clk *parent = NULL; + long best_rate = -EINVAL; + unsigned long parent_rate; + unsigned long tmp_rate; + int shift; + int i; - for (shift = 1; shift < PROG_PRES_MASK; shift++) { - cur_rate = *parent_rate >> shift; + for (i = 0; i < __clk_get_num_parents(hw->clk); i++) { + parent = clk_get_parent_by_index(hw->clk, i); + if (!parent) + continue; - if (cur_rate > rate) - new_diff = cur_rate - rate; - else - new_diff = rate - cur_rate; + parent_rate = __clk_get_rate(parent); + for (shift = 0; shift < PROG_PRES_MASK; shift++) { + tmp_rate = parent_rate >> shift; + if (tmp_rate <= rate) + break; + } - if (!new_diff) - return cur_rate; + if (tmp_rate > rate) + continue; - if (new_diff < best_diff) { - best_diff = new_diff; - best_rate = cur_rate; + if (best_rate < 0 || (rate - tmp_rate) < (rate - best_rate)) { + best_rate = tmp_rate; + *best_parent_rate = parent_rate; + *best_parent_clk = parent; } - if (rate > cur_rate) + if (!best_rate) break; } @@ -228,7 +228,7 @@ static const struct clk_ops programmable_ops = { .prepare = clk_programmable_prepare, .is_prepared = clk_programmable_is_ready, .recalc_rate = clk_programmable_recalc_rate, - .round_rate = clk_programmable_round_rate, + .determine_rate = clk_programmable_determine_rate, .get_parent = clk_programmable_get_parent, .set_parent = clk_programmable_set_parent, .set_rate = clk_programmable_set_rate, |