diff options
Diffstat (limited to 'ARM-cpufreq-support-for-Raspberry-Pi.patch')
| -rw-r--r-- | ARM-cpufreq-support-for-Raspberry-Pi.patch | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/ARM-cpufreq-support-for-Raspberry-Pi.patch b/ARM-cpufreq-support-for-Raspberry-Pi.patch index e259724ac..601caa070 100644 --- a/ARM-cpufreq-support-for-Raspberry-Pi.patch +++ b/ARM-cpufreq-support-for-Raspberry-Pi.patch @@ -470,173 +470,6 @@ index 61be15d9df7d..da26a584dca0 100644 -- 2.21.0 -From a94ed1abc52b51c55454b3f1a7181af9d91d9d73 Mon Sep 17 00:00:00 2001 -From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> -Date: Tue, 11 Jun 2019 19:58:40 +0200 -Subject: [PATCH 4/5] cpufreq: add driver for Raspbery Pi - -Raspberry Pi's firmware offers and interface though which update it's -performance requirements. It allows us to request for specific runtime -frequencies, which the firmware might or might not respect, depending on -the firmware configuration and thermals. - -As the maximum and minimum frequencies are configurable in the firmware -there is no way to know in advance their values. So the Raspberry Pi -cpufreq driver queries them, builds an opp frequency table to then -launch cpufreq-dt. - -Also, as the firmware interface might be configured as a module, making -the cpu clock unavailable during init, this implements a full fledged -driver, as opposed to most drivers registering cpufreq-dt, which only -make use of an init routine. - -Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> -Acked-by: Eric Anholt <eric@anholt.net> -Reviewed-by: Stephen Boyd <sboyd@kernel.org> ---- - drivers/cpufreq/Kconfig.arm | 8 +++ - drivers/cpufreq/Makefile | 1 + - drivers/cpufreq/raspberrypi-cpufreq.c | 97 +++++++++++++++++++++++++++ - 3 files changed, 106 insertions(+) - create mode 100644 drivers/cpufreq/raspberrypi-cpufreq.c - -diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm -index f8129edc145e..5e9204d443ff 100644 ---- a/drivers/cpufreq/Kconfig.arm -+++ b/drivers/cpufreq/Kconfig.arm -@@ -133,6 +133,14 @@ config ARM_QCOM_CPUFREQ_HW - The driver implements the cpufreq interface for this HW engine. - Say Y if you want to support CPUFreq HW. - -+config ARM_RASPBERRYPI_CPUFREQ -+ tristate "Raspberry Pi cpufreq support" -+ depends on CLK_RASPBERRYPI || COMPILE_TEST -+ help -+ This adds the CPUFreq driver for Raspberry Pi -+ -+ If in doubt, say N. -+ - config ARM_S3C_CPUFREQ - bool - help -diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile -index 689b26c6f949..121c1acb66c0 100644 ---- a/drivers/cpufreq/Makefile -+++ b/drivers/cpufreq/Makefile -@@ -64,6 +64,7 @@ obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o - obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o - obj-$(CONFIG_ARM_QCOM_CPUFREQ_HW) += qcom-cpufreq-hw.o - obj-$(CONFIG_ARM_QCOM_CPUFREQ_KRYO) += qcom-cpufreq-kryo.o -+obj-$(CONFIG_ARM_RASPBERRYPI_CPUFREQ) += raspberrypi-cpufreq.o - obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o - obj-$(CONFIG_ARM_S3C2412_CPUFREQ) += s3c2412-cpufreq.o - obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o -diff --git a/drivers/cpufreq/raspberrypi-cpufreq.c b/drivers/cpufreq/raspberrypi-cpufreq.c -new file mode 100644 -index 000000000000..2bc7d9734272 ---- /dev/null -+++ b/drivers/cpufreq/raspberrypi-cpufreq.c -@@ -0,0 +1,97 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Raspberry Pi cpufreq driver -+ * -+ * Copyright (C) 2019, Nicolas Saenz Julienne <nsaenzjulienne@suse.de> -+ */ -+ -+#include <linux/clk.h> -+#include <linux/cpu.h> -+#include <linux/cpufreq.h> -+#include <linux/module.h> -+#include <linux/platform_device.h> -+#include <linux/pm_opp.h> -+ -+#define RASPBERRYPI_FREQ_INTERVAL 100000000 -+ -+static struct platform_device *cpufreq_dt; -+ -+static int raspberrypi_cpufreq_probe(struct platform_device *pdev) -+{ -+ struct device *cpu_dev; -+ unsigned long min, max; -+ unsigned long rate; -+ struct clk *clk; -+ int ret; -+ -+ cpu_dev = get_cpu_device(0); -+ if (!cpu_dev) { -+ pr_err("Cannot get CPU for cpufreq driver\n"); -+ return -ENODEV; -+ } -+ -+ clk = clk_get(cpu_dev, NULL); -+ if (IS_ERR(clk)) { -+ dev_err(cpu_dev, "Cannot get clock for CPU0\n"); -+ return PTR_ERR(clk); -+ } -+ -+ /* -+ * The max and min frequencies are configurable in the Raspberry Pi -+ * firmware, so we query them at runtime. -+ */ -+ min = roundup(clk_round_rate(clk, 0), RASPBERRYPI_FREQ_INTERVAL); -+ max = roundup(clk_round_rate(clk, ULONG_MAX), RASPBERRYPI_FREQ_INTERVAL); -+ clk_put(clk); -+ -+ for (rate = min; rate <= max; rate += RASPBERRYPI_FREQ_INTERVAL) { -+ ret = dev_pm_opp_add(cpu_dev, rate, 0); -+ if (ret) -+ goto remove_opp; -+ } -+ -+ cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0); -+ ret = PTR_ERR_OR_ZERO(cpufreq_dt); -+ if (ret) { -+ dev_err(cpu_dev, "Failed to create platform device, %d\n", ret); -+ goto remove_opp; -+ } -+ -+ return 0; -+ -+remove_opp: -+ dev_pm_opp_remove_all_dynamic(cpu_dev); -+ -+ return ret; -+} -+ -+static int raspberrypi_cpufreq_remove(struct platform_device *pdev) -+{ -+ struct device *cpu_dev; -+ -+ cpu_dev = get_cpu_device(0); -+ if (cpu_dev) -+ dev_pm_opp_remove_all_dynamic(cpu_dev); -+ -+ platform_device_unregister(cpufreq_dt); -+ -+ return 0; -+} -+ -+/* -+ * Since the driver depends on clk-raspberrypi, which may return EPROBE_DEFER, -+ * all the activity is performed in the probe, which may be defered as well. -+ */ -+static struct platform_driver raspberrypi_cpufreq_driver = { -+ .driver = { -+ .name = "raspberrypi-cpufreq", -+ }, -+ .probe = raspberrypi_cpufreq_probe, -+ .remove = raspberrypi_cpufreq_remove, -+}; -+module_platform_driver(raspberrypi_cpufreq_driver); -+ -+MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de"); -+MODULE_DESCRIPTION("Raspberry Pi cpufreq driver"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("platform:raspberrypi-cpufreq"); --- -2.21.0 - From af32d83d10976ff357c56adba79fa3cb06e1c32d Mon Sep 17 00:00:00 2001 From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Date: Tue, 11 Jun 2019 19:58:42 +0200 |