linux-kernel - Re: [PATCH 1/3] soc: qcom: rpmh: Update dirty flag only when data changes

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Message-ID: <CAE=gft6DCqmX8=cHWXNeOjSTuRHL23t7+b_GZOrvUJAPfhVD8A@mail.gmail.com>
Date:   Tue, 4 Feb 2020 16:35:53 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Lina Iyer <ilina@...eaurora.org>, lsrao@...eaurora.org
Subject: Re: [PATCH 1/3] soc: qcom: rpmh: Update dirty flag only when data changes

On Mon, Feb 3, 2020 at 10:14 PM Maulik Shah <mkshah@...eaurora.org> wrote:
>
> Currently rpmh ctrlr dirty flag is set for all cases regardless
> of data is really changed or not.
>
> Add changes to update it when data is updated to new values.
>
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  drivers/soc/qcom/rpmh.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
> index 035091f..c3d6f00 100644
> --- a/drivers/soc/qcom/rpmh.c
> +++ b/drivers/soc/qcom/rpmh.c
> @@ -139,20 +139,27 @@ static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
>  existing:
>         switch (state) {
>         case RPMH_ACTIVE_ONLY_STATE:
> -               if (req->sleep_val != UINT_MAX)
> +               if (req->sleep_val != UINT_MAX) {
>                         req->wake_val = cmd->data;
> +                       ctrlr->dirty = true;
> +               }

Don't you need to set dirty = true for ACTIVE_ONLY state always? The
conditional is just saying "if nobody set a sleep vote, then maintain
this vote when we wake back up".