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Subject[PATCH] cpufreq: intel_pstate: warn if HWP Native mode and OOB mode are both set
Date
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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