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 11:23:59 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        robh+dt@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org
Cc:     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>
Subject: Re: [PATCH v4 4/5] arm64: dts: sdm845: Add OPP tables and
 power-domains for venus



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>;
> 
> 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@...0000 {
>>>
>>
> 

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