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authorEduardo Valentin <eduardo.valentin@ti.com>2014-01-06 09:04:18 -0400
committerEduardo Valentin <edubezval@gmail.com>2014-11-20 10:43:16 -0400
commitf9df89d897ee0928aa4e03b30250e87f5d1e788a (patch)
tree8f18e403fc6ef4225b0b40c3abfcb32d7ecef888 /drivers/thermal/Kconfig
parentfc14f9c1272f62c3e8d01300f52467c0d9af50f9 (diff)
downloadlinux-f9df89d897ee0928aa4e03b30250e87f5d1e788a.tar.bz2
thermal: introduce clock cooling device
This patch introduces a new thermal cooling device based on common clock framework. The original motivation to write this cooling device is to be able to cool down thermal zones using clocks that feed co-processors, such as GPUs, DSPs, Image Processing Co-processors, etc. But it is written in a way that it can be used on top of any clock. The implementation is pretty straight forward. The code creates a thermal cooling device based on a pair of a struct device and a clock name. The struct device is assumed to be usable by the OPP layer. The OPP layer is used as source of the list of possible frequencies. The (cpufreq) frequency table is then used as a map from frequencies to cooling states. Cooling states are indexes to the frequency table. The logic sits on top of common clock framework, specifically on clock pre notifications. Any PRE_RATE_CHANGE is hijacked, and the transition is only allowed when the new rate is within the thermal limit (cooling state -> freq). When a thermal cooling device state transition is requested, the clock is also checked to verify if the current clock rate is within the new thermal limit. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Mike Turquette <mturquette@linaro.org> Cc: Nishanth Menon <nm@ti.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Len Brown <len.brown@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-pm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal/Kconfig')
-rw-r--r--drivers/thermal/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index f554d25b4399..efbdb8c0bb1d 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -112,6 +112,18 @@ config CPU_THERMAL
If you want this support, you should say Y here.
+config CLOCK_THERMAL
+ bool "Generic clock cooling support"
+ depends on COMMON_CLK
+ depends on PM_OPP
+ help
+ This entry implements the generic clock cooling mechanism through
+ frequency clipping. Typically used to cool off co-processors. The
+ device that is configured to use this cooling mechanism will be
+ controlled to reduce clock frequency whenever temperature is high.
+
+ If you want this support, you should say Y here.
+
config THERMAL_EMULATION
bool "Thermal emulation mode support"
help