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platform/x86: ISST: Do Not Restore SST MSRs on CPU Online Operation

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During CPU offline/online operations, the hardware retains MSR settings.
Even if all CPUs are offlined, the package does not lose its MSR
settings.

Therefore, it is unnecessary to restore MSRs which are modified during
the online operation, and this extra step can be removed.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20250505202722.1048675-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada
2025-05-05 13:27:22 -07:00
committed by Ilpo Järvinen
parent c9a20142d3
commit c935ddfe65
1 changed files with 0 additions and 21 deletions
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21
drivers/platform/x86/intel/speed_select_if/isst_if_common.c
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@@ -198,25 +198,6 @@ void isst_resume_common(void)
}
EXPORT_SYMBOL_GPL(isst_resume_common);
static void isst_restore_msr_local(int cpu)
{
struct isst_cmd *sst_cmd;
int i;
mutex_lock(&isst_hash_lock);
for (i = 0; i < ARRAY_SIZE(punit_msr_white_list); ++i) {
if (!punit_msr_white_list[i])
break;
hash_for_each_possible(isst_hash, sst_cmd, hnode,
punit_msr_white_list[i]) {
if (!sst_cmd->mbox_cmd_type && sst_cmd->cpu == cpu)
wrmsrl_safe(sst_cmd->cmd, sst_cmd->data);
}
}
mutex_unlock(&isst_hash_lock);
}
/**
* isst_if_mbox_cmd_invalid() - Check invalid mailbox commands
* @cmd: Pointer to the command structure to verify.
@@ -434,8 +415,6 @@ static int isst_if_cpu_online(unsigned int cpu)
set_punit_id:
isst_cpu_info[cpu].punit_cpu_id = data;
isst_restore_msr_local(cpu);
return 0;
}