clk: keystone: sci-clk: cache results of last query rate operation (d3f3f499) · Commits · 戴 / test

drivers/clk/keystone/sci-clk.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,8 @@ struct sci_clk_provider {
		* @provider: Master clock provider
		* @flags: Flags for the clock
		* @node: Link for handling clocks probed via DT
		* @cached_req: Cached requested freq for determine rate calls
		* @cached_res: Cached result freq for determine rate calls
		*/
		struct sci_clk {
		struct clk_hw hw;
		@@ -63,6 +65,8 @@ struct sci_clk {
		struct sci_clk_provider *provider;
		u8 flags;
		struct list_head node;
		unsigned long cached_req;
		unsigned long cached_res;
		};

		#define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw)
		@@ -175,6 +179,11 @@ static int sci_clk_determine_rate(struct clk_hw *hw,
		int ret;
		u64 new_rate;

		if (clk->cached_req && clk->cached_req == req->rate) {
		req->rate = clk->cached_res;
		return 0;
		}

		ret = clk->provider->ops->get_best_match_freq(clk->provider->sci,
		clk->dev_id,
		clk->clk_id,
		@@ -189,6 +198,9 @@ static int sci_clk_determine_rate(struct clk_hw *hw,
		return ret;
		}

		clk->cached_req = req->rate;
		clk->cached_res = new_rate;

		req->rate = new_rate;

		return 0;
		@@ -249,6 +261,8 @@ static int sci_clk_set_parent(struct clk_hw *hw, u8 index)
		{
		struct sci_clk *clk = to_sci_clk(hw);

		clk->cached_req = 0;

		return clk->provider->ops->set_parent(clk->provider->sci, clk->dev_id,
		clk->clk_id,
		index + 1 + clk->clk_id);