linux-kernel - Re: [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO parent

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Date:   Tue, 21 Dec 2021 17:22:21 +0100
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Abhinav Kumar <abhinavk@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO
 parent

On 2021-12-15 16:43:45, Stephen Boyd wrote:
> Quoting Dmitry Baryshkov (2021-12-15 12:02:37)
> > On 14/12/2021 22:46, Marijn Suijten wrote:
> > > Hi all,
> > > 
> > > On 2021-09-18 16:40:38, Marijn Suijten wrote:
> > >> On 2021-09-14 14:44:01, Stephen Boyd wrote:
> > >>> Quoting Marijn Suijten (2021-09-11 06:19:19)
> > >>>> All DSI PHY/PLL drivers were referencing their VCO parent clock by a
> > >>>> global name, most of which don't exist or have been renamed.  These
> > >>>> clock drivers seem to function fine without that except the 14nm driver
> > >>>> for sdm6xx [1].
> > >>>>
> > >>>> At the same time all DTs provide a "ref" clock as per the requirements
> > >>>> of dsi-phy-common.yaml, but the clock is never used.  This patchset puts
> > >>>> that clock to use without relying on a global clock name, so that all
> > >>>> dependencies are explicitly defined in DT (the firmware) in the end.
> > >>>
> > >>> I can take this through clk tree if it helps avoid conflicts. There are
> > >>> some other patches to sdm660.c in the clk tree already.
> > >>
> > >> Might be useful to maintain proper ordering of these dependent patches
> > >> but it's up to Dmitry and Rob to decide, whom I'm sending this mail
> > >> directly to so that they can chime in.
> > > 
> > > Dependent patch [3] landed in 5.15 and [2] made it into 5.16 rc's - is
> > > it time to pick this series up and if so through what tree?
> > 
> > I'd also second the idea of merging these two patches into 5.17.
> > Most probably it'd be easier to merge both of them through the clk tree. 
> > Or we can take the first patch into drm-msm (but then we'd have a 
> > dependency between msm-next and clk-qcom-next).
> > 
> > Bjorn, Stephen?
> > 
> 
> Sounds fine to take through clk tree.

Thanks Stephen, would be great to take this in through the clk tree for
5.17.  I don't have anything to add that could possibly warrant a v3,
only msm8996 remains with the "xo" clock but that needs more work in
other drivers and is best dealt with separately.  Please take v2,
assuming there are enough acks/reviews :)

- Marijn