Re: [PATCH v2 0/3] phy: qcom-qmp-pcie: Add support to keep refclk always on

[Konrad Dybcio]

On 11/9/23 10:32, Krishna Chaitanya Chundru wrote:
> On 11/8/2023 3:27 AM, Konrad Dybcio wrote:
> > On 11/7/23 13:26, Krishna chaitanya chundru wrote:
> > > This series adds support to provide refclk to endpoint even in low
> > > power states.
> > >
> > > Due to some platform specific issues with CLKREQ signal, it is not being
> > > propagated to the host and as host doesn't know the clkreq signal host is
> > > not sending refclk. Due to this endpoint is seeing linkdown and going
> > > to bad state.
> > > To avoid those ref clk should be provided always to the endpoint. The
> > > issue is coming only when ep intiates the L1.1 or L1.2 exit and clkreq
> > > is not being propagated properly to the host.
> > I'm gonna sound like a broken record, but:
> >
> > How much power does this consume? Would it matter if we kept this
> > clock always-on for all platforms with this version of the phy?
> >
> > Konrad
>
> We see about 22mw extra power consumption with refclk always on.
>
> We can't keep this property always on as there is impact on power consumption.
Ooeheh, that's not far away from a low-clocked efficiency CPU core..

Thanks for checking!

Konrad