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thermal: intel: intel_tcc_cooling: Detect TCC lock bit

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When MSR_IA32_TEMPERATURE_TARGET is locked, TCC Offset can not be
updated even if the PROGRAMMABE Bit is set.

Yield the driver on platforms with MSR_IA32_TEMPERATURE_TARGET locked.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhang Rui 2022-11-08 16:12:19 +08:00 • committed by Rafael J. Wysocki
parent 54d9135cf2
commit be6abd3ed6
1 changed files with 10 additions and 0 deletions
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10
drivers/thermal/intel/intel_tcc_cooling.c
View file

@ -14,6 +14,7 @@
#define TCC_SHIFT 24
#define TCC_MASK (0x3fULL<<24)
#define TCC_PROGRAMMABLE BIT(30)
#define TCC_LOCKED BIT(31)
static struct thermal_cooling_device *tcc_cdev;
@ -108,6 +109,15 @@ static int __init tcc_cooling_init(void)
if (!(val & TCC_PROGRAMMABLE))
return -ENODEV;
err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val);
if (err)
return err;
if (val & TCC_LOCKED) {
pr_info("TCC Offset locked\n");
return -ENODEV;
}
pr_info("Programmable TCC Offset detected\n");
tcc_cdev =