On 13.02.2014 09:02, Thomas Abraham wrote:
On Wed, Feb 12, 2014 at 8:28 PM, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote:
Hi Thomas,
On 07.02.2014 16:55, Thomas Abraham wrote:
[snip]
diff --git a/drivers/cpufreq/cpufreq-cpu0.c
b/drivers/cpufreq/cpufreq-cpu0.c
index 0c12ffc..06539eb 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -195,6 +195,9 @@ static int cpu0_cpufreq_probe(struct platform_device
*pdev)
transition_latency += ret * 1000;
}
+ if (of_find_property(cpu_dev->of_node, "boost-frequency", NULL))
+ cpu0_cpufreq_driver.boost_supported = true;
+
ret = cpufreq_register_driver(&cpu0_cpufreq_driver);
if (ret) {
pr_err("failed register driver: %d\n", ret);
I'd say that boost should be enabled depending on user's preference, as done
before in Exynos cpufreq driver. So both presence of boost-frequency
property and state of CPU_FREQ_BOOST_SW should be considered.
As for CPU_FREQ_BOOST_SW, I don't think it should be always selected, but
ather, either converted to a user-selectable bool entry or made selectable
by other entry, like current ARM_EXYNOS_CPU_FREQ_BOOST_SW.
We still will have the same problem on Exynos multi-platform kernel
where one Exynos platform needs it and others don't. Same with just
using the CPU_FREQ_BOOST_SW config option. So that was the reason to
just fallback on presence of boost property.
I don't think we really have a problem here, because we have well
defined semantics for particular enable methods:
- Kconfig is supposed to be a global enable - if an option is
disabled, it is not even built into the kernel and can be used in any
way - this is per-user choice, regardless of platform the image is going
to be running on,
- device tree is supposed to be telling us whether the hardware we are
running on supports given feature and all the required data to enable
it, if yes,
- then, for per system configuration, you should be able to
enable/disable given feature by a command line parameter, e.g.
cpufreq.boost_disable.
If you follow the above description, you should be able to get any
configuration you want on any system, as long as it's supported by hardware.
Best regards,
Tomasz
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