linux-kernel - Re: [PATCH] clk: qcom: rpmh: Set wake/sleep state for BCM clks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 6 May 2022 19:24:15 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        patches@...ts.linux.dev, Alex Elder <elder@...aro.org>,
        Taniya Das <quic_tdas@...cinc.com>
Subject: Re: [PATCH] clk: qcom: rpmh: Set wake/sleep state for BCM clks

Quoting Bjorn Andersson (2022-05-04 09:53:54)
> On Tue 12 Apr 14:45 CDT 2022, Stephen Boyd wrote:
>
> > Set the wake and sleep state for BCM clks here, not just the active
> > state, as the active only state is dropped when CPUs go to deep idle.
> > This ensures the clk is always on when the driver thinks it is on.
> >
> > This was found by inspection, and could very well be incorrect if the
> > RPMh hardware copies over the active only state to the sleep and wake
> > states.
> >
>
> Taking another look at this patch and now it makes perfect sense to me.
> Sorry for not grasping the problem earlier.
>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>
>
> Will you take this in fixes, or do you want me to pick it for 5.19?
>

I'm waiting for Taniya to reply. For all I know this has no effect
because there's some sort of copy/paste from one state to another. Until
then it doesn't seem like we should do anything.