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

[Krishna Chaitanya Chundru]

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.

- Krishna Chaitanya