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authorAkshu Agrawal <Akshu.Agrawal@amd.com>2018-01-18 13:21:30 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-02-07 13:26:37 +0300
commit59a3b3a8db16621574cbac69f6f1eddb9c60e821 (patch)
tree3aa46cf5f5cde496c79e86b304c932f1dbf92d28 /drivers/cpufreq/amd_freq_sensitivity.c
parent703cbaa601ff3fb554d1246c336ba727cc083ea0 (diff)
downloadlinux-59a3b3a8db16621574cbac69f6f1eddb9c60e821.tar.xz
cpufreq: AMD: Ignore the check for ProcFeedback in ST/CZ
In ST/CZ CPUID 8000_0007_EDX[11, ProcFeedbackInterface] is 0, but the mechanism is still available and can be used. Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/amd_freq_sensitivity.c')
-rw-r--r--drivers/cpufreq/amd_freq_sensitivity.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/cpufreq/amd_freq_sensitivity.c b/drivers/cpufreq/amd_freq_sensitivity.c
index 042023bbbf62..be926d9a66e5 100644
--- a/drivers/cpufreq/amd_freq_sensitivity.c
+++ b/drivers/cpufreq/amd_freq_sensitivity.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
+#include <linux/pci.h>
#include <linux/percpu-defs.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
@@ -109,12 +110,18 @@ out:
static int __init amd_freq_sensitivity_init(void)
{
u64 val;
+ struct pci_dev *pcidev;
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return -ENODEV;
- if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
- return -ENODEV;
+ pcidev = pci_get_device(PCI_VENDOR_ID_AMD,
+ PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, NULL);
+
+ if (!pcidev) {
+ if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
+ return -ENODEV;
+ }
if (rdmsrl_safe(MSR_AMD64_FREQ_SENSITIVITY_ACTUAL, &val))
return -ENODEV;