ACPI / CPPC: Make CPPC ACPI driver aware of PCC subspace IDs

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Based on ACPI 6.2 Section 8.4.7.1.9 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 are initialized properly.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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This commit is contained in:

George Cherian

2017-10-11 08:54:58 +00:00

committed by Rafael J. Wysocki

parent c4b766c2f3

commit 85b1407bf6

1 changed files with 150 additions and 88 deletions

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drivers/acpi/cppc_acpi.c

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