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powerpc: powernv: Implement ppc_md.get_proc_freq()

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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 <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gautham R. Shenoy 2014-03-11 17:01:19 +05:30 committed by Benjamin Herrenschmidt
parent 2299d03a63
commit fb5153d05a
1 changed files with 21 additions and 0 deletions
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21
arch/powerpc/platforms/powernv/setup.c
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@ -27,6 +27,7 @@
#include <linux/interrupt.h>
#include <linux/bug.h>
#include <linux/pci.h>
#include <linux/cpufreq.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
@ -290,6 +291,25 @@ static int __init pnv_probe(void)
return 1;
}
/*
* 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,
@ -297,6 +317,7 @@ 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 = power7_idle,