Openwrt/target/linux/ipq806x/patches-5.4/0057-add-fab-scaling-support-with-cpufreq.patch

--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -15,6 +15,7 @@ clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-k
 clk-qcom-y += clk-hfpll.o
 clk-qcom-y += reset.o
 clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
+clk-qcom-y += fab_scaling.o
 
 # Keep alphabetically sorted by config
 obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o
--- /dev/null
+++ b/drivers/clk/qcom/fab_scaling.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/fab_scaling.h>
+
+struct qcom_fab_scaling_data {
+	u32 fab_freq_high;
+	u32 fab_freq_nominal;
+	u32 cpu_freq_threshold;
+	struct clk *apps_fab_clk;
+	struct clk *ddr_fab_clk;
+};
+
+static struct qcom_fab_scaling_data *drv_data;
+
+int scale_fabrics(unsigned long max_cpu_freq)
+{	
+	struct clk *apps_fab_clk = drv_data->apps_fab_clk,
+	           *ddr_fab_clk = drv_data->ddr_fab_clk;
+	unsigned long target_freq, cur_freq;
+	int ret;
+
+	/* Skip fab scaling if the driver is not ready */
+	if (!apps_fab_clk || !ddr_fab_clk)
+		return 0;
+
+	if (max_cpu_freq > drv_data->cpu_freq_threshold)
+		target_freq = drv_data->fab_freq_high;
+	else
+		target_freq = drv_data->fab_freq_nominal;
+
+	cur_freq = clk_get_rate(ddr_fab_clk);
+
+	if (target_freq != cur_freq) {
+		ret = clk_set_rate(apps_fab_clk, target_freq);
+		if (ret)
+			return ret;
+		ret = clk_set_rate(ddr_fab_clk, target_freq);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(scale_fabrics);
+
+static int ipq806x_fab_scaling_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct clk *apps_fab_clk, *ddr_fab_clk;
+	int ret;
+
+	if (!np)
+		return -ENODEV;
+	
+	drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
+	if (!drv_data)
+		return -ENOMEM;
+
+	if (of_property_read_u32(np, "fab_freq_high", &drv_data->fab_freq_high)) {
+		pr_err("FABRICS turbo freq not found. Using defaults...\n");
+		drv_data->fab_freq_high = 533000000;
+	}
+
+	if (of_property_read_u32(np, "fab_freq_nominal", &drv_data->fab_freq_nominal)) {
+		pr_err("FABRICS nominal freq not found. Using defaults...\n");
+		drv_data->fab_freq_nominal = 400000000;
+	}
+
+	if (of_property_read_u32(np, "cpu_freq_threshold", &drv_data->cpu_freq_threshold)) {
+		pr_err("FABRICS cpu freq threshold not found. Using defaults...\n");
+		drv_data->cpu_freq_threshold = 1000000000;
+	}
+
+	apps_fab_clk = devm_clk_get(&pdev->dev, "apps-fab-clk");
+	ret = PTR_ERR_OR_ZERO(apps_fab_clk);
+	if (ret) {
+		/*
+		 * If apps fab clk node is present, but clock is not yet
+		 * registered, we should try defering probe.
+		 */
+		if (ret != -EPROBE_DEFER) {
+			pr_err("Failed to get APPS FABRIC clock: %d\n", ret);
+			ret = -ENODEV;
+		}
+		goto err;
+	}
+
+	clk_prepare_enable(apps_fab_clk);
+	clk_set_rate(apps_fab_clk, drv_data->fab_freq_high);
+	drv_data->apps_fab_clk = apps_fab_clk;
+
+	ddr_fab_clk = devm_clk_get(&pdev->dev, "ddr-fab-clk");
+	ret = PTR_ERR_OR_ZERO(ddr_fab_clk);
+	if (ret) {
+		/*
+		 * If ddr fab clk node is present, but clock is not yet
+		 * registered, we should try defering probe.
+		 */
+		if (ret != -EPROBE_DEFER) {
+			pr_err("Failed to get DDR FABRIC clock: %d\n", ret);
+			ddr_fab_clk = NULL;
+			ret = -ENODEV;
+		}
+		goto err;
+	}
+
+	clk_prepare_enable(ddr_fab_clk);
+	clk_set_rate(ddr_fab_clk, drv_data->fab_freq_high);
+	drv_data->ddr_fab_clk = ddr_fab_clk;
+
+	return 0;
+err:
+	kfree(drv_data);
+	return ret;
+}
+
+static int ipq806x_fab_scaling_remove(struct platform_device *pdev)
+{
+	kfree(drv_data);
+	return 0;
+}
+
+static const struct of_device_id fab_scaling_ipq806x_match_table[] = {
+	{ .compatible = "qcom,fab-scaling" },
+	{ }
+};
+
+static struct platform_driver fab_scaling_ipq806x_driver = {
+	.probe		= ipq806x_fab_scaling_probe,
+	.remove		= ipq806x_fab_scaling_remove,
+	.driver		= {
+		.name   = "fab-scaling",
+		.of_match_table = fab_scaling_ipq806x_match_table,
+	},
+};
+
+static int __init fab_scaling_ipq806x_init(void)
+{
+	return platform_driver_register(&fab_scaling_ipq806x_driver);
+}
+late_initcall(fab_scaling_ipq806x_init);
+
+static void __exit fab_scaling_ipq806x_exit(void)
+{
+	platform_driver_unregister(&fab_scaling_ipq806x_driver);
+}
+module_exit(fab_scaling_ipq806x_exit);
--- /dev/null
+++ b/include/linux/fab_scaling.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+
+#ifndef __FAB_SCALING_H
+#define __FAB_SCALING_H
+
+/**
+ * scale_fabrics - Scale DDR and APPS FABRICS
+ *
+ * This function monitors all the registered clocks and does APPS
+ * and DDR FABRIC scaling based on the idle frequencies with which
+ * it was registered.
+ *
+ */
+int scale_fabrics(unsigned long max_cpu_freq);
+
+#endif
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -20,6 +20,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/thermal.h>
+#include <linux/fab_scaling.h>
 
 #include "cpufreq-dt.h"
 
@@ -111,6 +112,13 @@ static int set_target(struct cpufreq_pol
 					}
 				}
 			}
+
+			/*
+			 * Scale fabrics with max freq across all cores
+			 */
+			ret = scale_fabrics(target_freq);
+			if (ret)
+				goto exit;
 		}
 		priv->opp_freq = freq * 1000;
 		arch_set_freq_scale(policy->related_cpus, freq,