ipq806x: add fab scaling support
Add fab scaling support and dtsi definition Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
This commit is contained in:
Ansuel Smith
committed by
Álvaro Fernández Rojas
Álvaro Fernández Rojas
parent
0ef755b8ad
commit
5318a6dea3
@@ -546,6 +546,15 @@
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};
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};
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};
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};
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fab-scaling {
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compatible = "qcom,fab-scaling";
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clocks = <&rpmcc RPM_APPS_FABRIC_A_CLK>, <&rpmcc RPM_EBI1_A_CLK>;
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clock-names = "apps-fab-clk", "ddr-fab-clk";
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fab_freq_high = <533000000>;
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fab_freq_nominal = <400000000>;
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cpu_freq_threshold = <1000000000>;
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};
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firmware {
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firmware {
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scm {
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scm {
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compatible = "qcom,scm-ipq806x";
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compatible = "qcom,scm-ipq806x";
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@@ -0,0 +1,243 @@
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--- a/drivers/clk/qcom/Makefile
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+++ b/drivers/clk/qcom/Makefile
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@@ -15,6 +15,7 @@ clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-k
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clk-qcom-y += clk-hfpll.o
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clk-qcom-y += reset.o
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clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
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+clk-qcom-y += fab_scaling.o
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# Keep alphabetically sorted by config
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obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o
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--- /dev/null
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+++ b/drivers/clk/qcom/fab_scaling.c
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@@ -0,0 +1,172 @@
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+/*
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+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
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+ *
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+ * Permission to use, copy, modify, and/or distribute this software for any
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+ * purpose with or without fee is hereby granted, provided that the above
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+ * copyright notice and this permission notice appear in all copies.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/clk.h>
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+#include <linux/clk-provider.h>
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+#include <linux/slab.h>
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+#include <linux/fab_scaling.h>
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+
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+struct qcom_fab_scaling_data {
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+ u32 fab_freq_high;
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+ u32 fab_freq_nominal;
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+ u32 cpu_freq_threshold;
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+ struct clk *apps_fab_clk;
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+ struct clk *ddr_fab_clk;
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+};
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+
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+static struct qcom_fab_scaling_data *drv_data;
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+
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+int scale_fabrics(unsigned long max_cpu_freq)
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+{
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+ struct clk *apps_fab_clk = drv_data->apps_fab_clk,
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+ *ddr_fab_clk = drv_data->ddr_fab_clk;
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+ unsigned long target_freq, cur_freq;
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+ int ret;
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+
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+ /* Skip fab scaling if the driver is not ready */
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+ if (!apps_fab_clk || !ddr_fab_clk)
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+ return 0;
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+
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+ if (max_cpu_freq > drv_data->cpu_freq_threshold)
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+ target_freq = drv_data->fab_freq_high;
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+ else
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+ target_freq = drv_data->fab_freq_nominal;
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+
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+ cur_freq = clk_get_rate(ddr_fab_clk);
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+
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+ if (target_freq != cur_freq) {
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+ ret = clk_set_rate(apps_fab_clk, target_freq);
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+ if (ret)
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+ return ret;
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+ ret = clk_set_rate(ddr_fab_clk, target_freq);
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+ if (ret)
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(scale_fabrics);
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+
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+static int ipq806x_fab_scaling_probe(struct platform_device *pdev)
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+{
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+ struct device_node *np = pdev->dev.of_node;
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+ struct clk *apps_fab_clk, *ddr_fab_clk;
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+ int ret;
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+
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+ if (!np)
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+ return -ENODEV;
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+
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+ drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
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+ if (!drv_data)
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+ return -ENOMEM;
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+
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+ if (of_property_read_u32(np, "fab_freq_high", &drv_data->fab_freq_high)) {
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+ pr_err("FABRICS turbo freq not found. Using defaults...\n");
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+ drv_data->fab_freq_high = 533000000;
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+ }
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+
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+ if (of_property_read_u32(np, "fab_freq_nominal", &drv_data->fab_freq_nominal)) {
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+ pr_err("FABRICS nominal freq not found. Using defaults...\n");
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+ drv_data->fab_freq_nominal = 400000000;
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+ }
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+
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+ if (of_property_read_u32(np, "cpu_freq_threshold", &drv_data->cpu_freq_threshold)) {
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+ pr_err("FABRICS cpu freq threshold not found. Using defaults...\n");
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+ drv_data->cpu_freq_threshold = 1000000000;
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+ }
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+
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+ drv_data->apps_fab_clk = devm_clk_get(&pdev->dev, "apps-fab-clk");
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+ apps_fab_clk = drv_data->apps_fab_clk;
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+ ret = PTR_ERR_OR_ZERO(apps_fab_clk);
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+ if (ret) {
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+ /*
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+ * If apps fab clk node is present, but clock is not yet
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+ * registered, we should try defering probe.
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+ */
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+ if (ret != -EPROBE_DEFER) {
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+ pr_err("Failed to get APPS FABRIC clock: %d\n", ret);
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+ ret = -ENODEV;
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+ }
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+ goto err;
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+ }
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+
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+ clk_set_rate(apps_fab_clk, drv_data->fab_freq_high);
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+ clk_prepare_enable(apps_fab_clk);
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+
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+ drv_data->ddr_fab_clk = devm_clk_get(&pdev->dev, "ddr-fab-clk");
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+ ddr_fab_clk = drv_data->ddr_fab_clk;
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+ ret = PTR_ERR_OR_ZERO(ddr_fab_clk);
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+ if (ret) {
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+ /*
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+ * If ddr fab clk node is present, but clock is not yet
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+ * registered, we should try defering probe.
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+ */
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+ if (ret != -EPROBE_DEFER) {
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+ pr_err("Failed to get DDR FABRIC clock: %d\n", ret);
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+ ddr_fab_clk = NULL;
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+ ret = -ENODEV;
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+ }
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+ goto err;
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+ }
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+
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+ clk_set_rate(ddr_fab_clk, drv_data->fab_freq_high);
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+ clk_prepare_enable(ddr_fab_clk);
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+
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+ return 0;
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+err:
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+ kfree(drv_data);
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+ return ret;
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+}
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+
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+static int ipq806x_fab_scaling_remove(struct platform_device *pdev)
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+{
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+ kfree(drv_data);
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+ return 0;
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+}
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+
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+static const struct of_device_id fab_scaling_ipq806x_match_table[] = {
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+ { .compatible = "qcom,fab-scaling" },
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+ { }
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+};
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+
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+static struct platform_driver fab_scaling_ipq806x_driver = {
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+ .probe = ipq806x_fab_scaling_probe,
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+ .remove = ipq806x_fab_scaling_remove,
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+ .driver = {
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+ .name = "fab-scaling",
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+ .of_match_table = fab_scaling_ipq806x_match_table,
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+ },
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+};
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+
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+static int __init fab_scaling_ipq806x_init(void)
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+{
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+ return platform_driver_register(&fab_scaling_ipq806x_driver);
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+}
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+late_initcall(fab_scaling_ipq806x_init);
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+
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+static void __exit fab_scaling_ipq806x_exit(void)
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+{
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+ platform_driver_unregister(&fab_scaling_ipq806x_driver);
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+}
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+module_exit(fab_scaling_ipq806x_exit);
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--- /dev/null
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+++ b/include/linux/fab_scaling.h
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@@ -0,0 +1,31 @@
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+/*
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+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
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+ *
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+ * Permission to use, copy, modify, and/or distribute this software for any
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+ * purpose with or without fee is hereby granted, provided that the above
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+ * copyright notice and this permission notice appear in all copies.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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+ */
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+
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+
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+#ifndef __FAB_SCALING_H
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+#define __FAB_SCALING_H
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+
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+/**
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+ * scale_fabrics - Scale DDR and APPS FABRICS
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+ *
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+ * This function monitors all the registered clocks and does APPS
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+ * and DDR FABRIC scaling based on the idle frequencies with which
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+ * it was registered.
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+ *
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+ */
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+int scale_fabrics(unsigned long max_cpu_freq);
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+
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+#endif
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--- a/drivers/cpufreq/cpufreq-dt.c
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+++ b/drivers/cpufreq/cpufreq-dt.c
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@@ -24,6 +24,7 @@
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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+#include <linux/fab_scaling.h>
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#include "cpufreq-dt.h"
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@@ -101,6 +102,13 @@ static int set_target(struct cpufreq_pol
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}
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}
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}
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+
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+ /*
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+ * Scale fabrics with max freq across all cores
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+ */
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+ ret = scale_fabrics(target_freq);
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+ if (ret)
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+ goto exit;
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}
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priv->opp_freq = freq * 1000;
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arch_set_freq_scale(policy->related_cpus, freq,
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