Re: [PATCH v8 10/15] cpufreq: Add Kryo CPU scaling driver

Viresh Kumar
2018-05-18T01:45:47Z

On 17-05-18, 14:19, Ilia Lin wrote:
> +static int __init qcom_cpufreq_kryo_driver_init(void)
> +{
> + size_t len;
> + int ret = 0;
> + u32 versions;
> + enum _msm8996_version msm8996_version;
> + u8 *speedbin;
> + struct device *cpu_dev_silver, *cpu_dev_gold;
> + struct device_node *np;
> + struct nvmem_cell *speedbin_nvmem;
> + struct platform_device *pdev;
> + struct opp_table *opp_silver = NULL;
> + struct opp_table *opp_gold = NULL;

No need to initialize them and you may want to arrange all above in
decreasing order of their length.

> +
> + cpu_dev_silver = get_cpu_device(SILVER_LEAD);
> + if (IS_ERR_OR_NULL(cpu_dev_silver))
> + return PTR_ERR(cpu_dev_silver);
> +
> + cpu_dev_gold = get_cpu_device(SILVER_LEAD);
> + if (IS_ERR_OR_NULL(cpu_dev_gold))
> + return PTR_ERR(cpu_dev_gold);
> +
> + msm8996_version = qcom_cpufreq_kryo_get_msm_id();
> + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> + dev_err(cpu_dev_silver, "Not Snapdragon 820/821!");
> + return -ENODEV;
> + }
> +
> + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver);
> + 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_silver, "Could not get nvmem cell: %d\n", ret);
> + goto free_np;
> + }
> +
> + speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> + nvmem_cell_put(speedbin_nvmem);
> +
> + 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;
> + }
> +
> + opp_silver = dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1);
> + if (IS_ERR_OR_NULL(opp_silver)) {

This API doesn't return NULL and so IS_ERR() would be sufficient.

> + dev_err(cpu_dev_silver, "Failed to set supported hardware\n");
> + ret = PTR_ERR(opp_silver);
> + goto free_np;
> + }
> +
> + opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1);
> + if (IS_ERR_OR_NULL(opp_gold)) {

same here.

> + dev_err(cpu_dev_gold, "Failed to set supported hardware\n");
> + ret = PTR_ERR(opp_gold);
> + goto free_opp_silver;
> + }
> +
> + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
> + if (!IS_ERR_OR_NULL(pdev))
> + goto out;

Simply return from here and remove the useless label out.

> +
> + ret = PTR_ERR(pdev);
> + dev_err(cpu_dev_silver, "Failed to register platform device\n");
> + dev_pm_opp_put_supported_hw(opp_gold);
> +
> +free_opp_silver:
> + dev_pm_opp_put_supported_hw(opp_silver);
> +
> +free_np:
> + of_node_put(np);
> +
> +out:
> + return ret;
> +}
> +late_initcall(qcom_cpufreq_kryo_driver_init);

Please resend only this patch now or just paste the new code in a mail
here so that I can review it quickly and then you can resend the final
version. Most of the patches aren't changing anyway.

--
viresh