linux-kernel - Re: [PATCH 0/3] clk: qcom: gdsc: add support for collapse-vote registers

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]

Message-ID: <YotUwhIrwlSXH6Ak@hovoldconsulting.com>
Date:   Mon, 23 May 2022 11:32:50 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_tdas@...cinc.com,
        quic_rnayak@...cinc.com
Subject: Re: [PATCH 0/3] clk: qcom: gdsc: add support for collapse-vote
 registers

On Fri, May 20, 2022 at 08:51:09PM -0700, Stephen Boyd wrote:
> Please add Qualcomm on code for their hardware :)
> 
> I did a translation from codeaurora but I don't know if Rajendra's will
> work.

These addresses need to be added to .mailmap.

> Quoting Johan Hovold (2022-05-20 03:09:45)
> > Recent Qualcomm platforms have APCS collapse-vote registers that allow
> > for sharing GDSCs with other masters (e.g. LPASS).
> 
> How is it different from the voting logic that already exists in the
> gdsc file? Now every subsystem has to vote for off in addition to voting
> for on?

No, the voting logic is unchanged (i.e. enabling by clearing a collapse
bit).

The difference is just that a separate register register is used for the
voting.

> >     
> > Add support for using such vote registers instead of the control
> > register when updating the GDSC power state.

Johan