thermal: intel_pch_thermal: Add suspend/resume callback
Added suspend/resume callback to disable/enable PCH thermal sensor
respectively. If the sensor is enabled by the BIOS, then the sensor status
will not be changed during suspend/resume.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/intel_pch_thermal.c b/drivers/thermal/intel_pch_thermal.c
index 6a6ec1c..9b4815e 100644
--- a/drivers/thermal/intel_pch_thermal.c
+++ b/drivers/thermal/intel_pch_thermal.c
@@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/thermal.h>
+#include <linux/pm.h>
/* Intel PCH thermal Device IDs */
#define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
@@ -65,6 +66,7 @@
unsigned long crt_temp;
int hot_trip_id;
unsigned long hot_temp;
+ bool bios_enabled;
};
static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
@@ -75,8 +77,10 @@
*nr_trips = 0;
/* Check if BIOS has already enabled thermal sensor */
- if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))
+ if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS)) {
+ ptd->bios_enabled = true;
goto read_trips;
+ }
tsel = readb(ptd->hw_base + WPT_TSEL);
/*
@@ -130,9 +134,39 @@
return 0;
}
+static int pch_wpt_suspend(struct pch_thermal_device *ptd)
+{
+ u8 tsel;
+
+ if (ptd->bios_enabled)
+ return 0;
+
+ tsel = readb(ptd->hw_base + WPT_TSEL);
+
+ writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
+
+ return 0;
+}
+
+static int pch_wpt_resume(struct pch_thermal_device *ptd)
+{
+ u8 tsel;
+
+ if (ptd->bios_enabled)
+ return 0;
+
+ tsel = readb(ptd->hw_base + WPT_TSEL);
+
+ writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
+
+ return 0;
+}
+
struct pch_dev_ops {
int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
+ int (*suspend)(struct pch_thermal_device *ptd);
+ int (*resume)(struct pch_thermal_device *ptd);
};
@@ -140,6 +174,8 @@
static const struct pch_dev_ops pch_dev_ops_wpt = {
.hw_init = pch_wpt_init,
.get_temp = pch_wpt_get_temp,
+ .suspend = pch_wpt_suspend,
+ .resume = pch_wpt_resume,
};
static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
@@ -269,6 +305,22 @@
pci_disable_device(pdev);
}
+static int intel_pch_thermal_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
+
+ return ptd->ops->suspend(ptd);
+}
+
+static int intel_pch_thermal_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
+
+ return ptd->ops->resume(ptd);
+}
+
static struct pci_device_id intel_pch_thermal_id[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL) },
@@ -276,11 +328,17 @@
};
MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
+static const struct dev_pm_ops intel_pch_pm_ops = {
+ .suspend = intel_pch_thermal_suspend,
+ .resume = intel_pch_thermal_resume,
+};
+
static struct pci_driver intel_pch_thermal_driver = {
.name = "intel_pch_thermal",
.id_table = intel_pch_thermal_id,
.probe = intel_pch_thermal_probe,
.remove = intel_pch_thermal_remove,
+ .driver.pm = &intel_pch_pm_ops,
};
module_pci_driver(intel_pch_thermal_driver);