android/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cpufreq: intel_pstate: Override parameters if HWP forced by BIOS

Browse Source 
[ Upstream commit d9a7e9df731670acdc69e81748941ad338f47fab ]

If HWP has been already been enabled by BIOS, it may be
necessary to override some kernel command line parameters.
Once it has been enabled it requires a reset to be disabled.

Suggested-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Doug Smythies 2021-09-12 11:50:29 -07:00 committed by Greg Kroah-Hartman
parent 9561bb9887
commit e567d33508
1 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/cpufreq/intel_pstate.c
View File

@ -3035,11 +3035,15 @@ static int __init intel_pstate_init(void)
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -ENODEV;
if (no_load)
return -ENODEV;
id = x86_match_cpu(hwp_support_ids);
if (id) {
bool hwp_forced = intel_pstate_hwp_is_enabled();
if (hwp_forced)
pr_info("HWP enabled by BIOS\n");
else if (no_load)
return -ENODEV;
copy_cpu_funcs(&core_funcs);
/*
* Avoid enabling HWP for processors without EPP support,
@ -3049,8 +3053,7 @@ static int __init intel_pstate_init(void)
* If HWP is enabled already, though, there is no choice but to
* deal with it.
*/
if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) ||
intel_pstate_hwp_is_enabled()) {
if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) || hwp_forced) {
hwp_active++;
hwp_mode_bdw = id->driver_data;
intel_pstate.attr = hwp_cpufreq_attrs;
@ -3061,7 +3064,11 @@ static int __init intel_pstate_init(void)
goto hwp_cpu_matched;
}
pr_info("HWP not enabled\n");
} else {
if (no_load)
return -ENODEV;
id = x86_match_cpu(intel_pstate_cpu_ids);
if (!id) {
pr_info("CPU model not supported\n");
@ -3138,10 +3145,9 @@ static int __init intel_pstate_setup(char *str)
else if (!strcmp(str, "passive"))
default_driver = &intel_cpufreq;
if (!strcmp(str, "no_hwp")) {
pr_info("HWP disabled\n");
if (!strcmp(str, "no_hwp"))
no_hwp = 1;
}
if (!strcmp(str, "force"))
force_load = 1;
if (!strcmp(str, "hwp_only"))