From: "Gautham R. Shenoy" <e...@linux.vnet.ibm.com>
Implement a method named pnv_get_proc_freq(unsigned int cpu) which
returns the current clock rate on the 'cpu' in Hz to be reported in
/proc/cpuinfo. This method uses the value reported by cpufreq when
such a value is sane. Otherwise it falls back to old way of reporting
the clockrate, i.e. ppc_proc_freq.
Set the ppc_md.get_proc_freq() hook to pnv_get_proc_freq() on the
PowerNV platform.
Signed-off-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/setup.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/setup.c
b/arch/powerpc/platforms/powernv/setup.c
index 110f4fb..423e36d 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -28,6 +28,7 @@
#include <linux/bug.h>
#include <linux/cpuidle.h>
#include <linux/pci.h>
+#include <linux/cpufreq.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
@@ -235,6 +236,25 @@ void powernv_idle(void)
}
}
+/*
+ * Returns the cpu frequency for 'cpu' in Hz. This is used by
+ * /proc/cpuinfo
+ */
+unsigned long pnv_get_proc_freq(unsigned int cpu)
+{
+ unsigned long ret_freq;
+
+ ret_freq = cpufreq_quick_get(cpu) * 1000ul;
+
+ /*
+ * If the backend cpufreq driver does not exist,
+ * then fallback to old way of reporting the clockrate.
+ */
+ if (!ret_freq)
+ ret_freq = ppc_proc_freq;
+ return ret_freq;
+}
+
define_machine(powernv) {
.name = "PowerNV",
.probe = pnv_probe,
@@ -242,6 +262,7 @@ define_machine(powernv) {
.setup_arch = pnv_setup_arch,
.init_IRQ = pnv_init_IRQ,
.show_cpuinfo = pnv_show_cpuinfo,
+ .get_proc_freq = pnv_get_proc_freq,
.progress = pnv_progress,
.machine_shutdown = pnv_shutdown,
.power_save = powernv_idle,
--
1.8.3.1
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
