Re: [PATCH 3/4] arm64: dts: qcom: sa8775p: add support for video node

[Vikash Garodia]

On 3/15/2025 7:13 PM, Konrad Dybcio wrote:
> On 3/11/25 1:03 PM, Vikash Garodia wrote:
>> Video node enables video on Qualcomm SA8775P platform.
>>
>> Signed-off-by: Vikash Garodia <quic_vgarodia@xxxxxxxxxxx>
>> ---
>>  arch/arm64/boot/dts/qcom/sa8775p.dtsi | 67 +++++++++++++++++++++++++++++++++++
>>  1 file changed, 67 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> index 3394ae2d13003417a15e64c9e47833725ec779e6..09db8e2eb578f1cada0f4a15e3f844dc097bd46d 100644
>> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> @@ -10,6 +10,7 @@
>>  #include <dt-bindings/clock/qcom,sa8775p-dispcc.h>
>>  #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
>>  #include <dt-bindings/clock/qcom,sa8775p-gpucc.h>
>> +#include <dt-bindings/clock/qcom,sa8775p-videocc.h>
>>  #include <dt-bindings/dma/qcom-gpi.h>
>>  #include <dt-bindings/interconnect/qcom,sa8775p-rpmh.h>
>>  #include <dt-bindings/mailbox/qcom-ipcc.h>
>> @@ -3783,6 +3784,72 @@ llcc: system-cache-controller@9200000 {
>>  			interrupts = <GIC_SPI 580 IRQ_TYPE_LEVEL_HIGH>;
>>  		};
>>  
>> +		iris: video-codec@aa00000 {
>> +			compatible = "qcom,sa8775p-iris";
>> +
>> +			reg = <0 0x0aa00000 0 0xf0000>;
>> +			interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +			power-domains = <&videocc VIDEO_CC_MVS0C_GDSC>,
>> +					<&videocc VIDEO_CC_MVS0_GDSC>,
>> +					<&rpmhpd SA8775P_MXC>,
>> +					<&rpmhpd SA8775P_MMCX>;
>> +			power-domain-names = "venus",
>> +					     "vcodec0",
>> +					     "mx",
>> +					     "mmcx";
>> +			operating-points-v2 = <&iris_opp_table>;
>> +
>> +			clocks = <&gcc GCC_VIDEO_AXI0_CLK>,
>> +				 <&videocc VIDEO_CC_MVS0C_CLK>,
>> +				 <&videocc VIDEO_CC_MVS0_CLK>;
>> +			clock-names = "iface",
>> +				      "core",
>> +				      "vcodec0_core";
>> +
>> +			interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ALWAYS
>> +					&config_noc SLAVE_VENUS_CFG QCOM_ICC_TAG_ALWAYS>,
> 
> This path should use QCOM_ICC_TAG_ACTIVE_ONLY on both endpoints
What is the advantage of "ALWAYS" vs "ACTIVE_ONLY". Thinking of a possibility of
APSS power collapsed, while video hardware is processing a frame ?

Regards,
Vikash
> 
>> +					<&mmss_noc MASTER_VIDEO_P0 QCOM_ICC_TAG_ALWAYS
>> +					&mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>;
>> +			interconnect-names = "cpu-cfg",
>> +					     "video-mem";
>> +
>> +			firmware-name = "qcom/vpu/vpu30_p4_s6.mbn";
> 
> If it needs different firmware, I have my doubts over why 8550's data
> would be fully reused. Are you sure everything in iris_platform_sm8550.c
> applies?
> 
>> +			memory-region = <&pil_video_mem>;
>> +
>> +			resets = <&gcc GCC_VIDEO_AXI0_CLK_ARES>;
>> +			reset-names = "bus";
>> +
>> +			iommus = <&apps_smmu 0x0880 0x0400>,
>> +				 <&apps_smmu 0x0887 0x0400>;
>> +			dma-coherent;
>> +
>> +			iris_opp_table: opp-table {
>> +				compatible = "operating-points-v2";
>> +
>> +				opp-366000000 {
>> +					opp-hz = /bits/ 64 <366000000>;
>> +					required-opps = <&rpmhpd_opp_svs_l1>,
>> +							<&rpmhpd_opp_svs_l1>;
>> +				};
> 
> Please add a newline between subsequent subnodes
> 
> Konrad