linux-kernel - Re: [PATCH v2 4/4] interconnect: qcom: icc-rpmh: Add BCMs to commit list in pre

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Date:   Tue, 10 Aug 2021 19:18:02 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Mike Tipton <mdtipton@...eaurora.org>, djakov@...nel.org,
        agross@...nel.org, saravanak@...gle.com, okukatla@...eaurora.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Alex Elder <elder@...aro.org>
Subject: Re: [PATCH v2 4/4] interconnect: qcom: icc-rpmh: Add BCMs to commit
 list in pre_aggregate

On Tue 10 Aug 18:31 CDT 2021, Stephen Boyd wrote:

> Quoting Mike Tipton (2021-07-21 10:54:32)
> > We're only adding BCMs to the commit list in aggregate(), but there are
> > cases where pre_aggregate() is called without subsequently calling
> > aggregate(). In particular, in icc_sync_state() when a node with initial
> > BW has zero requests. Since BCMs aren't added to the commit list in
> > these cases, we don't actually send the zero BW request to HW. So the
> > resources remain on unnecessarily.
> >
> > Add BCMs to the commit list in pre_aggregate() instead, which is always
> > called even when there are no requests.
> >
> > Fixes: 976daac4a1c5 ("interconnect: qcom: Consolidate interconnect RPMh support")
> > Signed-off-by: Mike Tipton <mdtipton@...eaurora.org>
> > ---
> 
> This patch breaks reboot for me on sc7180 Lazor
> 

FWIW, it prevents at least SM8150 from booting (need to check my other
boards as well), because its no longer okay to have the interconnect
providers defined without having all client paths specified.

Regards,
Bjorn