Re: [PATCH] intel_idle: Add RaptorLake support

["Zhang, Rui" <rui.zhang@intel.com>]

On Sat, 2023-08-19 at 21:41 +0200, Guillaume Martres wrote:
> On 1/19/23 17:13, Zhang, Rui wrote:
> > On Thu, 2023-01-19 at 08:02 +0100, Álvaro Fernández Rojas wrote:
> > > This patch adds RaptorLake support to the intel_idle driver.
> > > 
> > > Since RaptorLake and AlderLake C-state are characteristics the
> > > same,
> > > we use
> > > AlderLake C-states tables for RaptorLake as well.
> > 
> > RPL and ADL have same cstates and use the same mwait hints, but the
> > latency of each c-state are still different on different platforms.
> > So we can not just duplicate the ADL table on RPL.
> > 
> > There is an effort ongoing that measures the latency of each
> > cstate on the RPL platforms. And based on the measurement result,
> > we
> > can decide if a new custom table is needed or we can just copy the
> > previous platform. Hopefully we will have a patch in a couple of
> > weeks.
> 
> Hi, I just stumbled upon this patch series as I was wondering about
> the
> lack of support for Raptor Lake in intel_idle.

intel_idle support for RaptorLake, and also other platforms that don't
have a custom table, is always there as long as we have BIOS support.
The custom table is just an optimization.

>  Your last message from
> January mentions a future patch, is it available anywhere or is this
> still future work?
> 

This is still work in progress because there are still some open
questions that we cannot answer from our measurement, and the table is
not finalized yet.

thanks,
rui