On 14-05-18, 16:11, Ilia Lin wrote:
> +static int __init qcom_cpufreq_kryo_driver_init(void)
> +{
> + size_t len;
> + int ret;
> + u32 versions;
> + enum _msm8996_version msm8996_version;
> + u8 *speedbin;
> + struct device *cpu_dev;
> + struct device_node *np;
> + struct nvmem_cell *speedbin_nvmem;
> + struct opp_table *opp_temp = NULL;
> +
> + cpu_dev = get_cpu_device(SILVER_LEAD);
> + if (IS_ERR_OR_NULL(cpu_dev))
> + return PTR_ERR(cpu_dev);
> +
> + msm8996_version = qcom_cpufreq_kryo_get_msm_id();
> + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> + dev_err(cpu_dev, "Not Snapdragon 820/821!");
> + return -ENODEV;
> + }
> +
> + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
> + if (IS_ERR_OR_NULL(np))
> + return PTR_ERR(np);
> +
> + if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
> + ret = -ENOENT;
> + goto free_np;
> + }
> +
> + speedbin_nvmem = of_nvmem_cell_get(np, NULL);
> + if (IS_ERR(speedbin_nvmem)) {
> + ret = PTR_ERR(speedbin_nvmem);
> + dev_err(cpu_dev, "Could not get nvmem cell: %d\n", ret);
> + goto free_np;
> + }
> +
> + speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> +
> + switch (msm8996_version) {
> + case MSM8996_V3:
> + versions = 1 << (unsigned int)(*speedbin);
> + break;
> + case MSM8996_SG:
> + versions = 1 << ((unsigned int)(*speedbin) + 4);
> + break;
> + default:
> + BUG();
> + break;
> + }
> +
> + ret = PTR_ERR_OR_ZERO(opp_temp = \
Why back slash here ?
> + dev_pm_opp_set_supported_hw(cpu_dev,&versions,1));
> + if (0 > ret)
> + goto free_np;
> +
> + dev_pm_opp_put_supported_hw(opp_temp);
> +
> + cpu_dev = get_cpu_device(GOLD_LEAD);
> + ret = PTR_ERR_OR_ZERO(opp_temp = \
And here.
> + dev_pm_opp_set_supported_hw(cpu_dev,&versions,1));
> + if (0 > ret)
> + goto free_np;
> +
> + ret = PTR_ERR_OR_ZERO(platform_device_register_simple("cpufreq-dt", \
and here.
> + -1, NULL, 0));
> +
> + dev_pm_opp_put_supported_hw(opp_temp);
And this is wrong. You don't need to call this in success case here.
It may have worked for you as cpufreq-dt driver would have already
been initialized, but that's not the case always. For example try
inserting cpufreq-dt module after kernel boots and it will fail.
> +
> +free_np:
> + of_node_put(np);
> +
> + return ret;
> +}
> +late_initcall(qcom_cpufreq_kryo_driver_init);
> +
> +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
--
viresh
