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

[Rajendra Nayak]

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@xxxxxxxxxxxxxx>
> > > ---
> > >   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>;
>
> 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.
I would expect a clk_round_rate() when called with 533000097 to return
a 533000000.

Taniya, Do you know why?

> If I change to opp-hz = /bits/ 64 <533000097> the error disappear.
>
> I guess we have to revisit m/n and/or pre-divider for this freq when the
> source pll is P_VIDEO_PLL0_OUT_MAIN PLL?
>
> > > +					required-opps = <&rpmhpd_opp_turbo>;
> > > +				};
> > > +			};
> > >   		};
> > >   
> > >   		videocc: clock-controller@ab00000 {

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