Messages in this thread Patch in this message | | | From | oceanhe@zoho ... | Subject | [PATCH] cpufreq: intel_pstate: warn if HWP Native mode and OOB mode are both set | Date | Sun, 29 Jul 2018 00:14:56 -0400 |
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From: Ocean He <hehy1@lenovo.com>
Refer to Intel HWPM Compliance Guide (Document Number: 566474): Bit[6] or bit[8] of MSR MISC_PWR_MGMT is set only when BIOS select either HWP Native mode or HWP OOB mode. Bit[6] and bit[8] cannot be set both at the same time.
Add a warning message if intel_pstate detects both HWP Native mode and HWP OOB mode are set at the same time.
Signed-off-by: Ocean He <hehy1@lenovo.com> --- drivers/cpufreq/intel_pstate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 3c39712..678d3f2 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2455,8 +2455,12 @@ static bool __init intel_pstate_platform_pwr_mgmt_exists(void) id = x86_match_cpu(intel_pstate_cpu_oob_ids); if (id) { rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); - if ( misc_pwr & (1 << 8)) + if (misc_pwr & (1 << 8)) { + if (misc_pwr & (1 << 6)) + pr_warn(FW_WARN + "HWP Native mode and OOB mode cannot be set both at the same time.\n"); return true; + } } idx = acpi_match_platform_list(plat_info); -- 1.8.3.1
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