Hi Hans,
On 9/17/2020 7:39 AM, Hans de Goede wrote:
Hi,
On 8/21/20 7:53 PM, Mark Pearson wrote:
Lenovo Thinkpad platforms with DYTC version 5 and newer have enhanced
firmware to provide different performance/thermal modes.
<Snip>
So we recently had another driver show up with almost the same interface
/ thing:
https://patchwork.kernel.org/patch/11774509/
So I believe that we really should come up with a standardize sysfs
interface
for this under /sys/class/<some-name>
Please see the "RFC: offering a standardized (/sys/class) userspace API
for selecting
system/laptop performance-profiles" mail thread which I just started.
Note I've not looked at the rest of this patch at all yet. But this
patch should
not be merged until the userspace API question is settled so nack to
this patch
for now (sorry).
Mark, once we have an agreement on what the userspace API for this should
look like I can implement a small helper-library / class-core for
registering
the class device for this, modify this patch to use that and test it on
a X1C8.
Or if you prefer you can do this yourself. Please let me know how you
want to
proceed with this.
I'll join in that thread and depending on what is involved and the level
of kernel expertise involved will contribute as much as I can. For sure
will modify, integrate and test this implementation once that is available.
If there is a way I can 'tweak' this patch to expose the current
performance mode to users in a way that is acceptable until the generic
solution is available let me know and I'll do that. I'm just guessing
that a generic solution needing input from multiple vendors could take a
little while to develop - having a way to check what mode your system is
in is really useful given you can change the mode using hotkeys.
Mark
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