[PATCH V2] drm/amdgpu/display: Enable DC_FP for LoongArch

[Alex Deucher]

On Fri, May 5, 2023 at 2:39 PM WANG Xuerui <kernel at xen0n.name> wrote:
>
> On 5/6/23 02:00, Alex Deucher wrote:
> > On Fri, May 5, 2023 at 1:57 PM WANG Xuerui <kernel at xen0n.name> wrote:
> >> <snip>
> >> On a side note, I had to modprobe amdgpu with runpm=0, otherwise my
> >> dmesg gets flooded with PSP getting resumed every 8~10 seconds or so. I
> >> currently have none of the connectors plugged in. I didn't notice any
> >> similar reports on the Internet so I don't know if it's due to platform
> >> quirks or not.
> > That might just be part of the normal suspend/resume process.  If it
> > happens at regular intervals, it sounds like something is waking the
> > GPU at a regular interval.  We should probably remove that message to
> > avoid it being too chatty, but you may want to check what is waking it
> > so much as doing so sort of negates the value of runtime power
> > management.
>
> Ah. This is extremely helpful as I'm immediately able to confirm it's
> node_exporter trying to access the hwmon readings (I have a monitoring
> infra for all my devboxes). Every sufficiently spaced read from say
> temp1_input wakes up the GPU. Not many people have their boxes working
> like this I guess... but at least we could probably reduce the log spam
> a bit if it's not feasible to get GPU metrics while avoiding to resume
> it? (Currently it's 25 lines per resume, mostly SMU resume logs and ring

Well, there are no metrics to pull because the GPU is powered down
when in runtime suspend.

Alex

> info.)
>
> And of course this is not a big deal, I can always work around it
> locally. Thanks for the hint again.
>
> --
> WANG "xen0n" Xuerui
>
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