Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-12-29 17:25:38 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

cpufreq/amd-pstate: Do not attempt to clear MSR_AMD_CPPC_ENABLE

Browse Source 
MSR_AMD_CPPC_ENABLE is a write once register, i.e. attempting to clear
it is futile, it will not take effect. Hence, return if disable (0)
argument is passed to the msr_cppc_enable()

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/20241023102108.5980-3-Dhananjay.Ugwekar@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Dhananjay Ugwekar 2024-10-23 10:21:08 +00:00 committed by Mario Limonciello
parent 7fb463aac8
commit 73070a9169
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/cpufreq/amd-pstate.c
View File

@ -311,6 +311,12 @@ static inline int msr_cppc_enable(bool enable)
int ret, cpu;
unsigned long logical_proc_id_mask = 0;
/*
* MSR_AMD_CPPC_ENABLE is write-once, once set it cannot be cleared.
*/
if (!enable)
return 0;
if (enable == cppc_enabled)
return 0;