Re: Support for low power mode for powerpc processors

2008-07-07 Thread Josh Boyer
On Fri, 04 Jul 2008 09:42:51 +1000 Benjamin Herrenschmidt <[EMAIL PROTECTED]> wrote: > On Thu, 2008-07-03 at 12:52 -0700, prodyut hazarika wrote: > > But a lot of SoC like 440GT/EX support two modes of power save - > > - Cut off power to other cores like PCIExpress/USB/MAC/UART etc > > - Lower the

Re: Support for low power mode for powerpc processors

2008-07-03 Thread Benjamin Herrenschmidt
On Thu, 2008-07-03 at 12:52 -0700, prodyut hazarika wrote: > But a lot of SoC like 440GT/EX support two modes of power save - > - Cut off power to other cores like PCIExpress/USB/MAC/UART etc > - Lower the CPU frequency > > Is it possible to scale down CPU freq or cut off power to unused cores > w

Re: Support for low power mode for powerpc processors

2008-07-03 Thread prodyut hazarika
But a lot of SoC like 440GT/EX support two modes of power save - - Cut off power to other cores like PCIExpress/USB/MAC/UART etc - Lower the CPU frequency Is it possible to scale down CPU freq or cut off power to unused cores while the CPU is idle? The ideal way would be that the SoC registers a s

Re: Support for low power mode for powerpc processors

2008-07-03 Thread Josh Boyer
On Thu, 3 Jul 2008 11:54:33 -0700 "prodyut hazarika" <[EMAIL PROTECTED]> wrote: > Hi all, > I would like to know whether Linux on PowerPC puts the processor on > low power mode during idle state. Most PowerPC processors support a > low power mode. I am looking to add support for low-power mode in

Support for low power mode for powerpc processors

2008-07-03 Thread prodyut hazarika
Hi all, I would like to know whether Linux on PowerPC puts the processor on low power mode during idle state. Most PowerPC processors support a low power mode. I am looking to add support for low-power mode in Linux for AMCC 4xx processors. My questions are the following: 1) Is tickless kernel int