4 files changed, 187 insertions, 0 deletions

diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
index c50e6616d02c..d7414361e432 100644
--- a/drivers/clk/qcom/clk-rcg.h
+++ b/drivers/clk/qcom/clk-rcg.h
@@ -190,6 +190,7 @@ struct clk_rcg2_gfx3d {
 
 extern const struct clk_ops clk_rcg2_ops;
 extern const struct clk_ops clk_rcg2_floor_ops;
+extern const struct clk_ops clk_rcg2_fm_ops;
 extern const struct clk_ops clk_rcg2_mux_closest_ops;
 extern const struct clk_ops clk_edp_pixel_ops;
 extern const struct clk_ops clk_byte_ops;
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 5183c74b074f..9b3aaa7f20ac 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -260,6 +260,115 @@ static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f,
 	return 0;
 }
 
+static const struct freq_conf *
+__clk_rcg2_select_conf(struct clk_hw *hw, const struct freq_multi_tbl *f,
+		       unsigned long req_rate)
+{
+	unsigned long rate_diff, best_rate_diff = ULONG_MAX;
+	const struct freq_conf *conf, *best_conf = NULL;
+	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+	const char *name = clk_hw_get_name(hw);
+	unsigned long parent_rate, rate;
+	struct clk_hw *p;
+	int index, i;
+
+	/* Exit early if only one config is defined */
+	if (f->num_confs == 1) {
+		best_conf = f->confs;
+		goto exit;
+	}
+
+	/* Search in each provided config the one that is near the wanted rate */
+	for (i = 0, conf = f->confs; i < f->num_confs; i++, conf++) {
+		index = qcom_find_src_index(hw, rcg->parent_map, conf->src);
+		if (index < 0)
+			continue;
+
+		p = clk_hw_get_parent_by_index(hw, index);
+		if (!p)
+			continue;
+
+		parent_rate =  clk_hw_get_rate(p);
+		rate = calc_rate(parent_rate, conf->n, conf->m, conf->n, conf->pre_div);
+
+		if (rate == req_rate) {
+			best_conf = conf;
+			goto exit;
+		}
+
+		rate_diff = abs_diff(req_rate, rate);
+		if (rate_diff < best_rate_diff) {
+			best_rate_diff = rate_diff;
+			best_conf = conf;
+		}
+	}
+
+	/*
+	 * Very unlikely. Warn if we couldn't find a correct config
+	 * due to parent not found in every config.
+	 */
+	if (unlikely(!best_conf)) {
+		WARN(1, "%s: can't find a configuration for rate %lu\n",
+		     name, req_rate);
+		return ERR_PTR(-EINVAL);
+	}
+
+exit:
+	return best_conf;
+}
+
+static int _freq_tbl_fm_determine_rate(struct clk_hw *hw, const struct freq_multi_tbl *f,
+				       struct clk_rate_request *req)
+{
+	unsigned long clk_flags, rate = req->rate;
+	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+	const struct freq_conf *conf;
+	struct clk_hw *p;
+	int index;
+
+	f = qcom_find_freq_multi(f, rate);
+	if (!f || !f->confs)
+		return -EINVAL;
+
+	conf = __clk_rcg2_select_conf(hw, f, rate);
+	if (IS_ERR(conf))
+		return PTR_ERR(conf);
+	index = qcom_find_src_index(hw, rcg->parent_map, conf->src);
+	if (index < 0)
+		return index;
+
+	clk_flags = clk_hw_get_flags(hw);
+	p = clk_hw_get_parent_by_index(hw, index);
+	if (!p)
+		return -EINVAL;
+
+	if (clk_flags & CLK_SET_RATE_PARENT) {
+		rate = f->freq;
+		if (conf->pre_div) {
+			if (!rate)
+				rate = req->rate;
+			rate /= 2;
+			rate *= conf->pre_div + 1;
+		}
+
+		if (conf->n) {
+			u64 tmp = rate;
+
+			tmp = tmp * conf->n;
+			do_div(tmp, conf->m);
+			rate = tmp;
+		}
+	} else {
+		rate =  clk_hw_get_rate(p);
+	}
+
+	req->best_parent_hw = p;
+	req->best_parent_rate = rate;
+	req->rate = f->freq;
+
+	return 0;
+}
+
 static int clk_rcg2_determine_rate(struct clk_hw *hw,
 				   struct clk_rate_request *req)
 {
@@ -276,6 +385,14 @@ static int clk_rcg2_determine_floor_rate(struct clk_hw *hw,
 	return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, FLOOR);
 }
 
+static int clk_rcg2_fm_determine_rate(struct clk_hw *hw,
+				      struct clk_rate_request *req)
+{
+	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+
+	return _freq_tbl_fm_determine_rate(hw, rcg->freq_multi_tbl, req);
+}
+
 static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f,
 				u32 *_cfg)
 {
@@ -371,6 +488,30 @@ static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
 	return clk_rcg2_configure(rcg, f);
 }
 
+static int __clk_rcg2_fm_set_rate(struct clk_hw *hw, unsigned long rate)
+{
+	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+	const struct freq_multi_tbl *f;
+	const struct freq_conf *conf;
+	struct freq_tbl f_tbl = {};
+
+	f = qcom_find_freq_multi(rcg->freq_multi_tbl, rate);
+	if (!f || !f->confs)
+		return -EINVAL;
+
+	conf = __clk_rcg2_select_conf(hw, f, rate);
+	if (IS_ERR(conf))
+		return PTR_ERR(conf);
+
+	f_tbl.freq = f->freq;
+	f_tbl.src = conf->src;
+	f_tbl.pre_div = conf->pre_div;
+	f_tbl.m = conf->m;
+	f_tbl.n = conf->n;
+
+	return clk_rcg2_configure(rcg, &f_tbl);
+}
+
 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
 			    unsigned long parent_rate)
 {
@@ -383,6 +524,12 @@ static int clk_rcg2_set_floor_rate(struct clk_hw *hw, unsigned long rate,
 	return __clk_rcg2_set_rate(hw, rate, FLOOR);
 }
 
+static int clk_rcg2_fm_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	return __clk_rcg2_fm_set_rate(hw, rate);
+}
+
 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
 		unsigned long rate, unsigned long parent_rate, u8 index)
 {
@@ -395,6 +542,12 @@ static int clk_rcg2_set_floor_rate_and_parent(struct clk_hw *hw,
 	return __clk_rcg2_set_rate(hw, rate, FLOOR);
 }
 
+static int clk_rcg2_fm_set_rate_and_parent(struct clk_hw *hw,
+		unsigned long rate, unsigned long parent_rate, u8 index)
+{
+	return __clk_rcg2_fm_set_rate(hw, rate);
+}
+
 static int clk_rcg2_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
 {
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
@@ -505,6 +658,19 @@ const struct clk_ops clk_rcg2_floor_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_rcg2_floor_ops);
 
+const struct clk_ops clk_rcg2_fm_ops = {
+	.is_enabled = clk_rcg2_is_enabled,
+	.get_parent = clk_rcg2_get_parent,
+	.set_parent = clk_rcg2_set_parent,
+	.recalc_rate = clk_rcg2_recalc_rate,
+	.determine_rate = clk_rcg2_fm_determine_rate,
+	.set_rate = clk_rcg2_fm_set_rate,
+	.set_rate_and_parent = clk_rcg2_fm_set_rate_and_parent,
+	.get_duty_cycle = clk_rcg2_get_duty_cycle,
+	.set_duty_cycle = clk_rcg2_set_duty_cycle,
+};
+EXPORT_SYMBOL_GPL(clk_rcg2_fm_ops);
+
 const struct clk_ops clk_rcg2_mux_closest_ops = {
 	.determine_rate = __clk_mux_determine_rate_closest,
 	.get_parent = clk_rcg2_get_parent,
diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index 75f09e6e057e..48f81e3a5e80 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -41,6 +41,24 @@ struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
 }
 EXPORT_SYMBOL_GPL(qcom_find_freq);
 
+const struct freq_multi_tbl *qcom_find_freq_multi(const struct freq_multi_tbl *f,
+						  unsigned long rate)
+{
+	if (!f)
+		return NULL;
+
+	if (!f->freq)
+		return f;
+
+	for (; f->freq; f++)
+		if (rate <= f->freq)
+			return f;
+
+	/* Default to our fastest rate */
+	return f - 1;
+}
+EXPORT_SYMBOL_GPL(qcom_find_freq_multi);
+
 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
 					    unsigned long rate)
 {
diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h
index 9c8f7b798d9f..2d4a8a837e6c 100644
--- a/drivers/clk/qcom/common.h
+++ b/drivers/clk/qcom/common.h
@@ -45,6 +45,8 @@ extern const struct freq_tbl *qcom_find_freq(const struct freq_tbl *f,
 					     unsigned long rate);
 extern const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
 						   unsigned long rate);
+extern const struct freq_multi_tbl *qcom_find_freq_multi(const struct freq_multi_tbl *f,
+							 unsigned long rate);
 extern void
 qcom_pll_set_fsm_mode(struct regmap *m, u32 reg, u8 bias_count, u8 lock_count);
 extern int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map,