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Commit c85c9a10 authored by Taniya Das's avatar Taniya Das
Browse files

clk: qcom: Add support for RCGs with dynamic and fixed sources 



Some RCGSs could have sources with dynamic frequencies and fixed sources
where if the RCG has the flag of CLK_SET_RATE_PARENT set, it would try to
propagate the clock rate to the fixed source PLLs too. To identify sources
of the RCGs where the rate should propagate to parent PLL, add a member in
freq_tbl to represent source frequency. This would be used by the
_freq_tbl_determine_rate to set its parent frequency on the PLL.

Change-Id: I7f1c0d9d84607821893a1e5d17934dae5acef5f4
Signed-off-by: default avatarTaniya Das <tdas@codeaurora.org>
parent 86b1c09b

drivers/clk/qcom/clk-rcg.h

+3 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2013, 2017, The Linux Foundation. All rights reserved.

 * Copyright (c) 2013, 2017-2018, The Linux Foundation. All rights reserved.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and
@@ -23,6 +23,8 @@ struct freq_tbl { 
	u8 pre_div;

	u16 m;

	u16 n;

	unsigned long src_freq;

#define FIXED_FREQ_SRC   0

};



/**

drivers/clk/qcom/clk-rcg2.c

+18 −2
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2013, 2017, The Linux Foundation. All rights reserved.

 * Copyright (c) 2013, 2017-2018, The Linux Foundation. All rights reserved.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and
@@ -296,9 +296,10 @@ static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, 
				    enum freq_policy policy)

{

	unsigned long clk_flags, rate = req->rate;

	struct clk_rate_request parent_req = { };

	struct clk_hw *p;

	struct clk_rcg2 *rcg = to_clk_rcg2(hw);

	int index;

	int index, ret = 0;



	switch (policy) {

	case FLOOR:
@@ -339,6 +340,21 @@ static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, 
	req->best_parent_rate = rate;

	req->rate = f->freq;



	if (f->src_freq != FIXED_FREQ_SRC) {

		rate = parent_req.rate = f->src_freq;

		parent_req.best_parent_hw = p;

		ret = __clk_determine_rate(p, &parent_req);

		if (ret)

			return ret;



		ret = clk_set_rate(p->clk, parent_req.rate);

		if (ret) {

			pr_err("Failed set rate(%lu) on parent for non-fixed source\n",

							parent_req.rate);

			return ret;

		}

	}



	return 0;

}