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Date: Sat, 21 Jul 2018 23:45:01 +0530
From: Taniya Das <tdas@...eaurora.org>
To: Stephen Boyd <sboyd@...nel.org>,
Michael Turquette <mturquette@...libre.com>
Cc: Andy Gross <andy.gross@...aro.org>,
David Brown <david.brown@...aro.org>,
Rajendra Nayak <rnayak@...eaurora.org>,
Amit Nischal <anischal@...eaurora.org>,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
grahamr@....qualcomm.com, Taniya Das <tdas@...eaurora.org>
Subject: [RFC PATCH 3/4] clk: qcom: Add prepare/unprepare clock ops for PLL/RCG
To put across power domain votes associated with a PLL or RCG, add the
prepare/unprepare clock ops which would map the corresponding performance
state corners for a clock frequency when the clk_prepare/clk_unprepare is
being invoked.
Also update the set_rate clock ops to send across the performance state to
genpd framework when a new frequency is being requested.
Signed-off-by: Taniya Das <tdas@...eaurora.org>
---
drivers/clk/qcom/clk-alpha-pll.c | 52 +++++++++++++++++++++++++++-------
drivers/clk/qcom/clk-rcg2.c | 61 +++++++++++++++++++++++++++++++++++-----
2 files changed, 96 insertions(+), 17 deletions(-)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 3c49a60..c03b6e4 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -1,14 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015, 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
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/kernel.h>
@@ -18,6 +10,7 @@
#include <linux/delay.h>
#include "clk-alpha-pll.h"
+#include "clk-pd.h"
#include "common.h"
#define PLL_MODE(p) ((p)->offset + 0x0)
@@ -522,7 +515,9 @@ static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate,
struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
const struct pll_vco *vco;
u32 l, alpha_width = pll_alpha_width(pll);
+ unsigned long old_rate = clk_hw_get_rate(hw);
u64 a;
+ int ret;
rate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
vco = alpha_pll_find_vco(pll, rate);
@@ -531,6 +526,15 @@ static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate,
return -EINVAL;
}
+ if (clk_hw_is_prepared(hw)) {
+ /* Enforce power domain requirement for new frequency */
+ ret = clk_power_domain_vote_rate(&pll->clkr, rate);
+ if (ret) {
+ pr_err("Failed to vote/set new rate %lu\n", rate);
+ return ret;
+ }
+ }
+
regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
if (alpha_width > ALPHA_BITWIDTH)
@@ -550,7 +554,15 @@ static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate,
regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll),
PLL_ALPHA_EN, PLL_ALPHA_EN);
- return clk_alpha_pll_update_latch(pll, is_enabled);
+ ret = clk_alpha_pll_update_latch(pll, is_enabled);
+ if (ret)
+ old_rate = rate;
+
+ if (clk_hw_is_prepared(hw))
+ /* Release the power domain requirement for old frequency */
+ clk_power_domain_unvote_rate(&pll->clkr, old_rate);
+
+ return ret;
}
static int clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -1017,7 +1029,25 @@ static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate,
return __clk_alpha_pll_update_latch(pll);
}
+static int clk_alpha_pll_prepare(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ unsigned long rate = clk_hw_get_rate(hw);
+
+ return clk_power_domain_vote_rate(&pll->clkr, rate);
+}
+
+static void clk_alpha_pll_unprepare(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ unsigned long rate = clk_hw_get_rate(hw);
+
+ clk_power_domain_unvote_rate(&pll->clkr, rate);
+}
+
const struct clk_ops clk_alpha_pll_fabia_ops = {
+ .prepare = clk_alpha_pll_prepare,
+ .unprepare = clk_alpha_pll_unprepare,
.enable = alpha_pll_fabia_enable,
.disable = alpha_pll_fabia_disable,
.is_enabled = clk_alpha_pll_is_enabled,
@@ -1028,6 +1058,8 @@ static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate,
EXPORT_SYMBOL_GPL(clk_alpha_pll_fabia_ops);
const struct clk_ops clk_alpha_pll_fixed_fabia_ops = {
+ .prepare = clk_alpha_pll_prepare,
+ .unprepare = clk_alpha_pll_unprepare,
.enable = alpha_pll_fabia_enable,
.disable = alpha_pll_fabia_disable,
.is_enabled = clk_alpha_pll_is_enabled,
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 52208d4..dc17dbf 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -15,6 +15,7 @@
#include <asm/div64.h>
+#include "clk-pd.h"
#include "clk-rcg.h"
#include "common.h"
@@ -247,26 +248,46 @@ static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
u32 cfg, mask;
struct clk_hw *hw = &rcg->clkr.hw;
int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
+ unsigned long old_rate = clk_hw_get_rate(hw);
if (index < 0)
return index;
+ /* Enforce power domain requirement for new frequency */
+ if (clk_hw_is_prepared(hw)) {
+ ret = clk_power_domain_vote_rate(&rcg->clkr, f->freq);
+ if (ret) {
+ pr_err("Failed to vote & set new rate %lu\n", f->freq);
+ return ret;
+ }
+ }
+
if (rcg->mnd_width && f->n) {
mask = BIT(rcg->mnd_width) - 1;
ret = regmap_update_bits(rcg->clkr.regmap,
rcg->cmd_rcgr + M_REG, mask, f->m);
- if (ret)
- return ret;
+ if (ret) {
+ /*
+ * Release the power domain requirement for
+ * new frequency
+ */
+ old_rate = f->freq;
+ goto out;
+ }
ret = regmap_update_bits(rcg->clkr.regmap,
rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
- if (ret)
- return ret;
+ if (ret) {
+ old_rate = f->freq;
+ goto out;
+ }
ret = regmap_update_bits(rcg->clkr.regmap,
rcg->cmd_rcgr + D_REG, mask, ~f->n);
- if (ret)
- return ret;
+ if (ret) {
+ old_rate = f->freq;
+ goto out;
+ }
}
mask = BIT(rcg->hid_width) - 1;
@@ -276,8 +297,14 @@ static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
if (rcg->mnd_width && f->n && (f->m != f->n))
cfg |= CFG_MODE_DUAL_EDGE;
- return regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
+ ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
mask, cfg);
+out:
+ if (clk_hw_is_prepared(hw))
+ /* Release the power domain requirement for old/new frequency */
+ clk_power_domain_unvote_rate(&rcg->clkr, old_rate);
+
+ return ret;
}
static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
@@ -338,7 +365,25 @@ 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_prepare(struct clk_hw *hw)
+{
+ struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+ unsigned long rate = clk_hw_get_rate(hw);
+
+ return clk_power_domain_vote_rate(&rcg->clkr, rate);
+}
+
+static void clk_rcg2_unprepare(struct clk_hw *hw)
+{
+ struct clk_rcg2 *rcg = to_clk_rcg2(hw);
+ unsigned long rate = clk_hw_get_rate(hw);
+
+ clk_power_domain_unvote_rate(&rcg->clkr, rate);
+}
+
const struct clk_ops clk_rcg2_ops = {
+ .prepare = clk_rcg2_prepare,
+ .unprepare = clk_rcg2_unprepare,
.is_enabled = clk_rcg2_is_enabled,
.get_parent = clk_rcg2_get_parent,
.set_parent = clk_rcg2_set_parent,
@@ -919,6 +964,8 @@ static void clk_rcg2_shared_disable(struct clk_hw *hw)
}
const struct clk_ops clk_rcg2_shared_ops = {
+ .prepare = clk_rcg2_prepare,
+ .unprepare = clk_rcg2_unprepare,
.enable = clk_rcg2_shared_enable,
.disable = clk_rcg2_shared_disable,
.get_parent = clk_rcg2_get_parent,
--
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