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    Subject[PATCH 4/5] Thermal: make sure cpufreq cooling register after cpufreq driver
    Date
    From: "hongbo.zhang" <hongbo.zhang@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.zhang@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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