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SubjectRe: [PATCH v5 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids

On 10/11/2017 2:54 AM, George Cherian wrote:
> Based on ACPI 6.2 Section If the PCC register space is used,
> all PCC registers, for all processors in the same performance
> domain (as defined by _PSD), must be defined to be in the same subspace.
> Based on Section 14.1 of ACPI specification, it is possible to have a
> maximum of 256 PCC subspace ids. Add support of multiple PCC subspace id
> instead of using a single global pcc_data structure.
> While at that fix the time_delta check in send_pcc_cmd() so that last_mpar_reset
> and mpar_count is initialized properly.
> Signed-off-by: George Cherian <>
Reviewed-by: Prashanth Prakash <>


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