linux-kernel - Re: [PATCH v5 5/5] arm64: dts: qcom: qcm2290: Add venus video node

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Message-ID: <7df8a438-364e-431e-8424-209ad7482efc@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 17:27:04 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
        Jorge Ramirez <jorge.ramirez@....qualcomm.com>
Cc: krzk+dt@...nel.org, bryan.odonoghue@...aro.org, quic_dikshita@...cinc.com,
        mchehab@...nel.org, robh@...nel.org, conor+dt@...nel.org,
        konradybcio@...nel.org, andersson@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 5/5] arm64: dts: qcom: qcm2290: Add venus video node

On 6/27/25 5:23 PM, Vikash Garodia wrote:
> 
> On 6/27/2025 8:50 PM, Konrad Dybcio wrote:
>> On 6/27/25 5:12 PM, Vikash Garodia wrote:
>>>
>>> On 6/27/2025 8:38 PM, Jorge Ramirez wrote:
>>>> On 27/06/25 20:28:29, Vikash Garodia wrote:
>>>>>
>>>>> On 6/27/2025 6:03 PM, Jorge Ramirez wrote:
>>>>>> On 27/06/25 17:40:19, Vikash Garodia wrote:
>>>>>>>
>>>>>>> On 6/26/2025 7:29 PM, Jorge Ramirez-Ortiz wrote:
>>>>>>>> Add DT entries for the qcm2290 venus encoder/decoder.
>>>>>>>>
>>>>>>>> Co-developed-by: Loic Poulain <loic.poulain@....qualcomm.com>
>>>>>>>> Signed-off-by: Loic Poulain <loic.poulain@....qualcomm.com>
>>>>>>>> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>
>>>>>>>> ---
>>>>>>>>  arch/arm64/boot/dts/qcom/qcm2290.dtsi | 57 +++++++++++++++++++++++++++
>>>>>>>>  1 file changed, 57 insertions(+)
>>>>>>>>
>>>>>>>> diff --git a/arch/arm64/boot/dts/qcom/qcm2290.dtsi b/arch/arm64/boot/dts/qcom/qcm2290.dtsi
>>>>>>>> index f49ac1c1f8a3..5326c91a0ff0 100644
>>>>>>>> --- a/arch/arm64/boot/dts/qcom/qcm2290.dtsi
>>>>>>>> +++ b/arch/arm64/boot/dts/qcom/qcm2290.dtsi
>>>>>>>> @@ -1628,6 +1628,63 @@ adreno_smmu: iommu@...0000 {
>>>>>>>>  			#iommu-cells = <2>;
>>>>>>>>  		};
>>>>>>>>  
>>>>>>>> +		venus: video-codec@...0000 {
>>>>>>>> +			compatible = "qcom,qcm2290-venus";
>>>>>>>> +			reg = <0 0x5a00000 0 0xf0000>;
>>>>>>>> +			interrupts = <GIC_SPI 225 IRQ_TYPE_LEVEL_HIGH>;
>>>>>>>> +
>>>>>>>> +			power-domains = <&gcc GCC_VENUS_GDSC>,
>>>>>>>> +					<&gcc GCC_VCODEC0_GDSC>,
>>>>>>>> +					<&rpmpd QCM2290_VDDCX>;
>>>>>>>> +			power-domain-names = "venus",
>>>>>>>> +					     "vcodec0",
>>>>>>>> +					     "cx";
>>>>>>>> +			operating-points-v2 = <&venus_opp_table>;
>>>>>>>> +
>>>>>>>> +			clocks = <&gcc GCC_VIDEO_VENUS_CTL_CLK>,
>>>>>>>> +				 <&gcc GCC_VIDEO_AHB_CLK>,
>>>>>>>> +				 <&gcc GCC_VENUS_CTL_AXI_CLK>,
>>>>>>>> +				 <&gcc GCC_VIDEO_THROTTLE_CORE_CLK>,
>>>>>>>> +				 <&gcc GCC_VIDEO_VCODEC0_SYS_CLK>,
>>>>>>>> +				 <&gcc GCC_VCODEC0_AXI_CLK>;
>>>>>>>> +			clock-names = "core",
>>>>>>>> +				      "iface",
>>>>>>>> +				      "bus",
>>>>>>>> +				      "throttle",
>>>>>>>> +				      "vcodec0_core",
>>>>>>>> +				      "vcodec0_bus";
>>>>>>>> +
>>>>>>>> +			memory-region = <&pil_video_mem>;
>>>>>>>> +			iommus = <&apps_smmu 0x860 0x0>,
>>>>>>>> +				 <&apps_smmu 0x880 0x0>,
>>>>>>>> +				 <&apps_smmu 0x861 0x04>,
>>>>>>>> +				 <&apps_smmu 0x863 0x0>,
>>>>>>>> +				 <&apps_smmu 0x804 0xe0>;
>>>>>>> keep only the non secure ones.
>>>>>>
>>>>>> ok
>>>>>>
>>>>>>>> +
>>>>>>>> +			interconnects = <&mmnrt_virt MASTER_VIDEO_P0 RPM_ALWAYS_TAG
>>>>>>>> +					 &bimc SLAVE_EBI1 RPM_ALWAYS_TAG>,
>>>>>>>> +					<&bimc MASTER_APPSS_PROC RPM_ACTIVE_TAG
>>>>>>>> +					 &config_noc SLAVE_VENUS_CFG RPM_ACTIVE_TAG>;
>>>>>>>> +			interconnect-names = "video-mem",
>>>>>>>> +					     "cpu-cfg";
>>>>>>>> +
>>>>>>>> +			status = "okay";
>>>>>>>> +
>>>>>>>> +			venus_opp_table: opp-table {
>>>>>>>> +				compatible = "operating-points-v2";
>>>>>>>> +
>>>>>>>> +				opp-133000000 {
>>>>>>>> +					opp-hz = /bits/ 64 <133000000>;
>>>>>>>> +					required-opps = <&rpmpd_opp_low_svs>;
>>>>>>>> +				};
>>>>>>> Fix the corner freq value
>>>>>>
>>>>>> can you add some reference please?
>>>>>>
>>>>>> I took this data from an internal document - not sure why the downstream
>>>>>> driver supports different values or where those were taken from (AFAIK
>>>>>> they are not supported)
>>>>> Most likely you have referred incorrect downstream file. Refer scuba-vidc.dtsi.
>>>>
>>>> I took them from actual documents (which might or might not be obsolete,
>>>> hard to say but they were the latest version and as such, they
>>>> contradict the downstream dtsi).
>>>>
>>>> So I'd rather not use downstream - could you point me to the reference
>>>> you used please - I wonder if the fix is required downstream instead of here?
>>>
>>> You can look for this file gcc-scuba.c and refer gcc_video_venus_clk_src which
>>> is the src for different venus clocks.
>>
>> This is not a good source in general, GCC often has more rates defined
>> than the consumer is supposed to finally run at (because they were deemed
>> power-inefficient or similar, you can pretty much set any rate you want
>> on the clocks fwiw)
> Count wise, i agree. Value-wise, afaik, corners should match OR are you saying
> client scaling request for 133.0 MHz is ok when src is generating 133.33 MHz ?

I *think* we're running a closest-match in there.. but I'd love to
have the clock and consumer drivers agree on the rate exactly
(which in this case would be 133333333 - and the clock plan in
our docs agrees)

Konrad