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From: Ilia Lin <ilialin@codeaurora.org>
To: mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org,
	mark.rutland@arm.com, viresh.kumar@linaro.org, nm@ti.com,
	lgirdwood@gmail.com, broonie@kernel.org, andy.gross@linaro.org,
	david.brown@linaro.org, catalin.marinas@arm.com,
	will.deacon@arm.com, rjw@rjwysocki.net,
	linux-clk@vger.kernel.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	rnayak@codeaurora.org, ilialin@codeaurora.org,
	amit.kucheria@linaro.org, nicolas.dechesne@linaro.org,
	celster@codeaurora.org, tfinkel@codeaurora.org
Subject: [PATCH v6 05/14] clk: qcom: cpu-8996: Add support to switch to alternate PLL
Date: Mon, 14 May 2018 16:11:51 +0300
Message-ID: <1526303520-5843-6-git-send-email-ilialin@codeaurora.org> (raw)
In-Reply-To: <1526303520-5843-1-git-send-email-ilialin@codeaurora.org>

From: Rajendra Nayak <rnayak@codeaurora.org>

Each of the CPU clusters on msm8996 are powered via a primary
PLL and a secondary PLL. The primary PLL is what drives the
CPU clk, except for times when we are reprogramming the PLL
itself, when we temporarily switch to an alternate PLL.
Use clock rate change notifiers to support this.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>
---
 drivers/clk/qcom/clk-cpu-8996.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c
index beb97eb..390b369 100644
--- a/drivers/clk/qcom/clk-cpu-8996.c
+++ b/drivers/clk/qcom/clk-cpu-8996.c
@@ -61,6 +61,7 @@
  * detect voltage droops. We do not add support for ACD as yet.
  */
 
+#include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -187,10 +188,14 @@ struct clk_cpu_8996_mux {
 	u32	reg;
 	u8	shift;
 	u8	width;
+	struct notifier_block nb;
 	struct clk_hw	*pll;
 	struct clk_regmap clkr;
 };
 
+#define to_clk_cpu_8996_mux_nb(_nb) \
+	container_of(_nb, struct clk_cpu_8996_mux, nb)
+
 static inline
 struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw)
 {
@@ -236,6 +241,26 @@ static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
 	return 0;
 }
 
+int cpu_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
+			void *data)
+{
+	int ret;
+	struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_nb(nb);
+
+	switch (event) {
+	case PRE_RATE_CHANGE:
+		ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, ALT_INDEX);
+		break;
+	case POST_RATE_CHANGE:
+		ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, PLL_INDEX);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+
+	return notifier_from_errno(ret);
+};
 const struct clk_ops clk_cpu_8996_mux_ops = {
 	.set_parent = clk_cpu_8996_mux_set_parent,
 	.get_parent = clk_cpu_8996_mux_get_parent,
@@ -279,6 +304,7 @@ static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
 	.shift = 0,
 	.width = 2,
 	.pll = &pwrcl_pll.clkr.hw,
+	.nb.notifier_call = cpu_clk_notifier_cb,
 	.clkr.hw.init = &(struct clk_init_data) {
 		.name = "pwrcl_pmux",
 		.parent_names = (const char *[]){
@@ -298,6 +324,7 @@ static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
 	.shift = 0,
 	.width = 2,
 	.pll = &perfcl_pll.clkr.hw,
+	.nb.notifier_call = cpu_clk_notifier_cb,
 	.clkr.hw.init = &(struct clk_init_data) {
 		.name = "perfcl_pmux",
 		.parent_names = (const char *[]){
@@ -356,6 +383,12 @@ struct clk_regmap *clks[] = {
 	clk_alpha_pll_configure(&perfcl_alt_pll, regmap, &altpll_config);
 	clk_alpha_pll_configure(&pwrcl_alt_pll, regmap, &altpll_config);
 
+	ret = clk_notifier_register(pwrcl_pmux.clkr.hw.clk, &pwrcl_pmux.nb);
+	if (ret)
+		return ret;
+
+	ret = clk_notifier_register(perfcl_pmux.clkr.hw.clk, &perfcl_pmux.nb);
+
 	return ret;
 }
 
-- 
1.9.1

  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-14 13:11 [PATCH v6 00/14] CPU scaling support for msm8996 Ilia Lin
2018-05-14 13:11 ` [PATCH v6 01/14] soc: qcom: Separate kryo l2 accessors from PMU driver Ilia Lin
2018-05-14 13:11 ` [PATCH v6 02/14] clk: qcom: Make clk_alpha_pll_configure available to modules Ilia Lin
2018-05-14 13:11 ` [PATCH v6 03/14] clk: qcom: Add CPU clock driver for msm8996 Ilia Lin
2018-05-14 13:11 ` [PATCH v6 04/14] clk: qcom: Add DT bindings for " Ilia Lin
2018-05-14 13:11 ` Ilia Lin [this message]
2018-05-14 13:11 ` [PATCH v6 06/14] clk: qcom: cpu-8996: Add support to switch below 600Mhz Ilia Lin
2018-05-14 13:11 ` [PATCH v6 07/14] clk: qcom: Add ACD path to CPU clock driver for msm8996 Ilia Lin
2018-05-14 13:11 ` [PATCH v6 08/14] dt: qcom: Add opp and thermal to the msm8996 Ilia Lin
2018-05-15  4:04   ` Viresh Kumar
2018-05-14 13:11 ` [PATCH v6 09/14] regulator: qcom_spmi: Add support for SAW Ilia Lin
2018-05-14 13:11 ` [PATCH v6 10/14] dt-bindings: qcom_spmi: Add support for SAW documentation Ilia Lin
2018-05-14 13:11 ` [PATCH v6 11/14] dt: qcom: Add SAW regulator for 8x96 CPUs Ilia Lin
2018-05-15  4:04   ` Viresh Kumar
2018-05-14 13:11 ` [PATCH v6 12/14] cpufreq: Add Kryo CPU scaling driver Ilia Lin
2018-05-15  4:09   ` Viresh Kumar
2018-05-14 13:11 ` [PATCH v6 13/14] dt-bindings: cpufreq: Document operating-points-v2-kryo-cpu Ilia Lin
2018-05-15  4:09   ` Viresh Kumar
2018-05-14 13:12 ` [PATCH v6 14/14] dt: qcom: Add qcom-cpufreq-kryo driver configuration Ilia Lin
2018-05-15  4:11   ` Viresh Kumar

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