linux-kernel - Re: [PATCH] tty: serial: qcom-geni-serial: Drop the icc bw votes in suspend for console

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Message-ID: <CAD=FV=XJQaAHsDb6uvKpwU87qtqTQgNeoiuRr2kF9pqjBLhLpg@mail.gmail.com>
Date:   Mon, 13 Jul 2020 17:53:20 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Akash Asthana <akashast@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-serial@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH] tty: serial: qcom-geni-serial: Drop the icc bw votes in
 suspend for console

Rajendra,

On Fri, Jul 10, 2020 at 5:41 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Thu, Jul 09, 2020 at 03:07:00PM +0530, Rajendra Nayak wrote:
> > When using the geni-serial as console, its important to be
> > able to hit the lowest possible power state in suspend,
> > even with no_console_suspend.
> > The only thing that prevents it today on platforms like the sc7180
> > is the interconnect BW votes, which we certainly don't need when
> > the system is in suspend. So in the suspend handler mark them as
> > ACTIVE_ONLY (0x3) and on resume switch them back to the ALWAYS tag (0x7)
> >
> > Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> > ---
> > Note: Patch applies on qcom for-next, which has the ICC support patches.
> > The tag macros are currently not exported and hence the hardcoded values.
> > Perhaps if and when https://patchwork.kernel.org/patch/11619705/ lands I
> > can refresh this patch to use the macros.
>
> Feel free to take this patch through that tree.
>
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Could you post a v2?  Bjorn landed some of my geni serial patches to
make console / kgdb work better, but then I realized that your patch
no longer applies cleanly.  It's trivial to resolve, so hopefully a v2
should be quick and then Bjorn can land?

Thanks!

-Doug