linux-kernel - Re: [PATCH V4 2/6] iommu/arm-smmu: Add pm

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: <20170712230152.GC22780@codeaurora.org>
Date:   Wed, 12 Jul 2017 16:01:52 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     joro@...tes.org, robin.murphy@....com, robh+dt@...nel.org,
        mark.rutland@....com, will.deacon@....com,
        m.szyprowski@...sung.com, robdclark@...il.com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, sricharan@...eaurora.org,
        stanimir.varbanov@...aro.org, architt@...eaurora.org,
        linux-arm-kernel@...ts.infradead.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH V4 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops

On 07/12, Stephen Boyd wrote:
> On 07/06, Vivek Gautam wrote:
> > From: Sricharan R <sricharan@...eaurora.org>
> > 
> > The smmu needs to be functional only when the respective
> > master's using it are active. The device_link feature
> > helps to track such functional dependencies, so that the
> > iommu gets powered when the master device enables itself
> > using pm_runtime. So by adapting the smmu driver for
> > runtime pm, above said dependency can be addressed.
> > 
> > This patch adds the pm runtime/sleep callbacks to the
> > driver and also the functions to parse the smmu clocks
> > from DT and enable them in resume/suspend.
> > 
> > Signed-off-by: Sricharan R <sricharan@...eaurora.org>
> > Signed-off-by: Archit Taneja <architt@...eaurora.org>
> > [vivek: Clock rework to loop over clock names data]
> > Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> > ---
> 
> General comment, we have a bulk clk API now, but I guess we
> failed to add the clk_bulk_prepare_enable() API that could be
> used here. Perhaps you can add that API and then use it here to
> reduce lines of code.
> 

Bjorn just sent a patch for that API an hour ago.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project