linux-kernel - Re: [PATCH v4 4/5] arm64: dts: sdm845: Add OPP tables and power-domains for venus

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Date:   Mon, 27 Jul 2020 21:08:06 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        robh+dt@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, Taniya Das <tdas@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v4 4/5] arm64: dts: sdm845: Add OPP tables and
 power-domains for venus

On 27-07-20, 17:38, Rajendra Nayak wrote:
> 
> On 7/27/2020 11:23 AM, Rajendra Nayak wrote:
> > 
> > 
> > On 7/24/2020 7:39 PM, Stanimir Varbanov wrote:
> > > Hi,
> > > 
> > > On 7/23/20 9:06 PM, Stanimir Varbanov wrote:
> > > > Hi Rajendra,
> > > > 
> > > > After applying 2,3 and 4/5 patches on linaro-integration v5.8-rc2 I see
> > > > below messages on db845:
> > > > 
> > > > qcom-venus aa00000.video-codec: dev_pm_opp_set_rate: failed to find
> > > > current OPP for freq 533000097 (-34)
> > > > 
> > > > ^^^ This one is new.
> > > > 
> > > > qcom_rpmh TCS Busy, retrying RPMH message send: addr=0x30000
> > > > 
> > > > ^^^ and this message is annoying, can we make it pr_debug in rpmh?
> > > > 
> > > > On 7/23/20 2:26 PM, Rajendra Nayak wrote:
> > > > > Add the OPP tables in order to be able to vote on the performance state of
> > > > > a power-domain.
> > > > > 
> > > > > Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> > > > > ---
> > > > >   arch/arm64/boot/dts/qcom/sdm845.dtsi | 40 ++++++++++++++++++++++++++++++++++--
> > > > >   1 file changed, 38 insertions(+), 2 deletions(-)
> > > > > 
> > > > > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > > > index e506793..5ca2265 100644
> > > > > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > > > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > > > @@ -3631,8 +3631,10 @@
> > > > >               interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
> > > > >               power-domains = <&videocc VENUS_GDSC>,
> > > > >                       <&videocc VCODEC0_GDSC>,
> > > > > -                    <&videocc VCODEC1_GDSC>;
> > > > > -            power-domain-names = "venus", "vcodec0", "vcodec1";
> > > > > +                    <&videocc VCODEC1_GDSC>,
> > > > > +                    <&rpmhpd SDM845_CX>;
> > > > > +            power-domain-names = "venus", "vcodec0", "vcodec1", "cx";
> > > > > +            operating-points-v2 = <&venus_opp_table>;
> > > > >               clocks = <&videocc VIDEO_CC_VENUS_CTL_CORE_CLK>,
> > > > >                    <&videocc VIDEO_CC_VENUS_AHB_CLK>,
> > > > >                    <&videocc VIDEO_CC_VENUS_CTL_AXI_CLK>,
> > > > > @@ -3654,6 +3656,40 @@
> > > > >               video-core1 {
> > > > >                   compatible = "venus-encoder";
> > > > >               };
> > > > > +
> > > > > +            venus_opp_table: venus-opp-table {
> > > > > +                compatible = "operating-points-v2";
> > > > > +
> > > > > +                opp-100000000 {
> > > > > +                    opp-hz = /bits/ 64 <100000000>;
> > > > > +                    required-opps = <&rpmhpd_opp_min_svs>;
> > > > > +                };
> > > > > +
> > > > > +                opp-200000000 {
> > > > > +                    opp-hz = /bits/ 64 <200000000>;
> > > > > +                    required-opps = <&rpmhpd_opp_low_svs>;
> > > > > +                };
> > > > > +
> > > > > +                opp-320000000 {
> > > > > +                    opp-hz = /bits/ 64 <320000000>;
> > > > > +                    required-opps = <&rpmhpd_opp_svs>;
> > > > > +                };
> > > > > +
> > > > > +                opp-380000000 {
> > > > > +                    opp-hz = /bits/ 64 <380000000>;
> > > > > +                    required-opps = <&rpmhpd_opp_svs_l1>;
> > > > > +                };
> > > > > +
> > > > > +                opp-444000000 {
> > > > > +                    opp-hz = /bits/ 64 <444000000>;
> > > > > +                    required-opps = <&rpmhpd_opp_nom>;
> > > > > +                };
> > > > > +
> > > > > +                opp-533000000 {
> > > > > +                    opp-hz = /bits/ 64 <533000000>;

Is this the highest OPP in table ?

> > > Actually it comes from videocc, where ftbl_video_cc_venus_clk_src
> > > defines 533000000 but the real calculated freq is 533000097.
> > 
> > I still don't quite understand why the videocc driver returns this
> > frequency despite this not being in the freq table.
> 
> Ok, so I see the same issue on sc7180 also. clk_round_rate() does seem to
> return whats in the freq table, but clk_set_rate() goes ahead and sets it
> to 533000097. Subsequently when we try to set a different OPP, it fails to
> find the 'current' OPP entry for 533000097. This sounds like an issue with the OPP
> framework? Should we not fall back to the highest OPP as the current OPP?
> 
> Stephen/Viresh, any thoughts?

I think we (in all frameworks generally) try to set a frequency <=
target frequency and so there may be a problem if the frequency is
larger than highest supported. IOW, you need to fix tables a bit.

-- 
viresh