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ipq806x: add fab scaling support

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Add fab scaling support and dtsi definition

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
master
Ansuel Smith 4 years ago committed by Álvaro Fernández Rojas
parent 0ef755b8ad
commit 5318a6dea3
2 changed files with 252 additions and 0 deletions
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9
target/linux/ipq806x/files-4.19/arch/arm/boot/dts/qcom-ipq8064.dtsi
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@ -546,6 +546,15 @@
};
};
fab-scaling {
compatible = "qcom,fab-scaling";
clocks = <&rpmcc RPM_APPS_FABRIC_A_CLK>, <&rpmcc RPM_EBI1_A_CLK>;
clock-names = "apps-fab-clk", "ddr-fab-clk";
fab_freq_high = <533000000>;
fab_freq_nominal = <400000000>;
cpu_freq_threshold = <1000000000>;
};
firmware {
scm {
compatible = "qcom,scm-ipq806x";

243
target/linux/ipq806x/patches-4.19/0057-add-fab-scaling-support-with-cpufreq.patch
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@ -0,0 +1,243 @@
--- 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;
+ }
+
+ drv_data->apps_fab_clk = devm_clk_get(&pdev->dev, "apps-fab-clk");
+ apps_fab_clk = drv_data->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_set_rate(apps_fab_clk, drv_data->fab_freq_high);
+ clk_prepare_enable(apps_fab_clk);
+
+ drv_data->ddr_fab_clk = devm_clk_get(&pdev->dev, "ddr-fab-clk");
+ ddr_fab_clk = drv_data->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_set_rate(ddr_fab_clk, drv_data->fab_freq_high);
+ clk_prepare_enable(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
@@ -24,6 +24,7 @@
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/thermal.h>
+#include <linux/fab_scaling.h>
#include "cpufreq-dt.h"
@@ -101,6 +102,13 @@ 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,
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