diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.13/123-clk-sunxi-automatic-reparenting.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.13/123-clk-sunxi-automatic-reparenting.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.13/123-clk-sunxi-automatic-reparenting.patch b/target/linux/sunxi/patches-3.13/123-clk-sunxi-automatic-reparenting.patch new file mode 100644 index 0000000000..c772b9fe6f --- /dev/null +++ b/target/linux/sunxi/patches-3.13/123-clk-sunxi-automatic-reparenting.patch @@ -0,0 +1,73 @@ +From 04b5b3f9c83c0c0b472c4704d83ec7f56a485a21 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Emilio=20L=C3=B3pez?= <emilio@elopez.com.ar> +Date: Thu, 5 Sep 2013 19:52:41 -0300 +Subject: [PATCH] clk: sunxi: factors: automatic reparenting support +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This commit implements .determine_rate, so that our factor clocks can be +reparented when needed. + +Signed-off-by: Emilio López <emilio@elopez.com.ar> +--- + drivers/clk/sunxi/clk-factors.c | 36 ++++++++++++++++++++++++++++++++++++ + 1 file changed, 36 insertions(+) + +diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c +index 9e23264..3806d97 100644 +--- a/drivers/clk/sunxi/clk-factors.c ++++ b/drivers/clk/sunxi/clk-factors.c +@@ -77,6 +77,41 @@ static long clk_factors_round_rate(struct clk_hw *hw, unsigned long rate, + return rate; + } + ++static long clk_factors_determine_rate(struct clk_hw *hw, unsigned long rate, ++ unsigned long *best_parent_rate, ++ struct clk **best_parent_p) ++{ ++ struct clk *clk = hw->clk, *parent, *best_parent = NULL; ++ int i, num_parents; ++ unsigned long parent_rate, best = 0, child_rate, best_child_rate = 0; ++ ++ /* find the parent that can help provide the fastest rate <= rate */ ++ num_parents = __clk_get_num_parents(clk); ++ for (i = 0; i < num_parents; i++) { ++ parent = clk_get_parent_by_index(clk, i); ++ if (!parent) ++ continue; ++ if (__clk_get_flags(clk) & CLK_SET_RATE_PARENT) ++ parent_rate = __clk_round_rate(parent, rate); ++ else ++ parent_rate = __clk_get_rate(parent); ++ ++ child_rate = clk_factors_round_rate(hw, rate, &parent_rate); ++ ++ if (child_rate <= rate && child_rate > best_child_rate) { ++ best_parent = parent; ++ best = parent_rate; ++ best_child_rate = child_rate; ++ } ++ } ++ ++ if (best_parent) ++ *best_parent_p = best_parent; ++ *best_parent_rate = best; ++ ++ return best_child_rate; ++} ++ + static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) + { +@@ -113,6 +148,7 @@ static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate, + } + + const struct clk_ops clk_factors_ops = { ++ .determine_rate = clk_factors_determine_rate, + .recalc_rate = clk_factors_recalc_rate, + .round_rate = clk_factors_round_rate, + .set_rate = clk_factors_set_rate, +-- +1.8.5.1 + |