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

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Message-ID: <bac1e5e4-ed18-4e26-a883-2a41bf8468a8@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 17:20:44 +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 5:12 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)

Konrad