From: "hongbo.zhang" <hongbo.zh...@linaro.com>
The cpufreq works as a cooling device, so the cooling layer should
check and wait until the cpufreq driver is initialized.
Signed-off-by: hongbo.zhang <hongbo.zh...@linaro.com>
---
drivers/thermal/cpu_cooling.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index d196230..01aba58 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/cpu_cooling.h>
+#include <linux/delay.h>
/**
* struct cpufreq_cooling_device
@@ -352,9 +353,18 @@ struct thermal_cooling_device *cpufreq_cooling_register(
struct cpufreq_cooling_device *cpufreq_dev = NULL;
unsigned int cpufreq_dev_count = 0, min = 0, max = 0;
char dev_name[THERMAL_NAME_LENGTH];
- int ret = 0, i;
+ int ret = 0, to = 1000, i;
struct cpufreq_policy policy;
+ /* make sure cpufreq driver is initialized */
+ while (!cpufreq_frequency_get_table(0) && --to)
+ mdelay(10);
+
+ if (!to) {
+ pr_err("No cpufreq driver act as cooling device.\n");
+ return ERR_PTR(-ENOSYS);
+ }
+
list_for_each_entry(cpufreq_dev, &cooling_cpufreq_list, node)
cpufreq_dev_count++;
--
1.7.11.3
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