Commit be6abd3e authored by Zhang Rui's avatar Zhang Rui Committed by Rafael J. Wysocki
Browse files

thermal: intel: intel_tcc_cooling: Detect TCC lock bit 



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: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 54d9135c

drivers/thermal/intel/intel_tcc_cooling.c

+10 −0
Original line number Diff line number Diff line
@@ -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 =