[RFC PATCH v2 4/4] arm64: qcom: add cpu operations

Arnd Bergmann
2015-04-10T20:57:48Z

On Friday 10 April 2015 15:43:25 Kumar Gala wrote:
> +static int qcom_cpu_boot(unsigned int cpu)
> +{
> + int ret = 0;
> +
> + if (per_cpu(cold_boot_done, cpu) == false) {
> + ret = qcom_unclamp_secondary_arm_cpu(cpu);
> + if (ret)
> + return ret;
> + per_cpu(cold_boot_done, cpu) = true;
> + }
> + return secondary_pen_release(cpu);
> +}
> +

Please add a comment here to explain why you need a two-stage process here,
rather than just booting the CPU without the secondary_pen.

Are you working around a specific silicon bug here?

Arnd