cpufreq: imx6q-cpufreq: assign cpu_dev correctly to cpu0 device

Commit cdc58d602d2e657602a90c190cbf745886c95977 "cpufreq: imx6q-cpufreq:
remove device tree parsing for cpu nodes" assumed the pdev->dev is set to
cpu0 device in the platform code. But it actually points to the virtual
cpufreq-cpu0 platform device which is not present in the device tree.
Most of the information needed by cpufreq is stored in cpu0 DT node.
So cpu_dev must point to cpu0 device.

This patch fixes the wrong assignment to cpu_dev.

Reported-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 85a1b51346c8db12845d3123dd7758af034e3357..90372a21087f9ef38535479ccc35aac9e37977dc 100644 (file)
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -233,10 +233,15 @@ put_node:
        of_node_put(np);
 }
 
-static void __init imx6q_opp_init(struct device *cpu_dev)
+static void __init imx6q_opp_init(void)
 {
        struct device_node *np;
+       struct device *cpu_dev = get_cpu_device(0);
 
+       if (!cpu_dev) {
+               pr_warn("failed to get cpu0 device\n");
+               return;
+       }
        np = of_node_get(cpu_dev->of_node);
        if (!np) {
                pr_warn("failed to find cpu0 node\n");
@@ -268,7 +273,7 @@ static void __init imx6q_init_late(void)
                imx6q_cpuidle_init();
 
        if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
-               imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
+               imx6q_opp_init();
                platform_device_register(&imx6q_cpufreq_pdev);
        }
 }

diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 3e396543aea4f74bb6b2d54e5a839eedf43a2c1a..c3fd2a101ca02852c677d021c567b27ee74b075a 100644 (file)
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/delay.h>
 #include <linux/err.h>
@@ -202,7 +203,11 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
        unsigned long min_volt, max_volt;
        int num, ret;
 
-       cpu_dev = &pdev->dev;
+       cpu_dev = get_cpu_device(0);
+       if (!cpu_dev) {
+               pr_err("failed to get cpu0 device\n");
+               return -ENODEV;
+       }
 
        np = of_node_get(cpu_dev->of_node);
        if (!np) {