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

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Message-ID: <98a35a51-6351-5ebb-4207-0004e89682eb@quicinc.com>
Date: Tue, 18 Mar 2025 19:13:38 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>
CC: Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konradybcio@...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 3/4] arm64: dts: qcom: sa8775p: add support for video node


On 3/18/2025 5:52 PM, Konrad Dybcio wrote:
> On 3/17/25 12:31 PM, Dmitry Baryshkov wrote:
>> On Tue, Mar 11, 2025 at 05:33:55PM +0530, Vikash Garodia wrote:
>>> Video node enables video on Qualcomm SA8775P platform.
>>>
>>> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
>>> ---
>>>  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@...0000 {
>>>  			interrupts = <GIC_SPI 580 IRQ_TYPE_LEVEL_HIGH>;
>>>  		};
>>>  
>>> +		iris: video-codec@...0000 {
>>> +			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>,
>>> +					<&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";
>>> +			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;
>>
>> I think almost missed it:
>>
>> 	status = "disabled";
>>
>> Don't enable the device by default, there is a chance of the firmware
>> being not present.
> 
> On a sidenote, venus driver broke sync_state by requesting the firmware at
> load time, instead of at the time of first open (though the latter could
> introduce some latency on first video playback, but both are debatable) -
> what does iris do here?
iris does it on first open
Regards,
Vikash
> 
> Konrad>