linux-kernel - Re: [PATCH v3] arm64: dts: qcom: sc7180: Add A618 gpu dt blob

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Date:   Wed, 05 Feb 2020 12:21:38 +0530
From:   smasetty@...eaurora.org
To:     Doug Anderson <dianders@...omium.org>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, dri-devel@...edesktop.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: qcom: sc7180: Add A618 gpu dt blob

On 2020-02-01 03:13, Doug Anderson wrote:
> Hi,
> 
> On Fri, Jan 31, 2020 at 4:04 AM Sharat Masetty 
> <smasetty@...eaurora.org> wrote:
>> 
>> +               adreno_smmu: iommu@...0000 {
>> +                       compatible = "qcom,sc7180-smmu-v2", 
>> "qcom,smmu-v2";
>> +                       reg = <0 0x05040000 0 0x10000>;
>> +                       #iommu-cells = <1>;
>> +                       #global-interrupts = <2>;
>> +                       interrupts = <GIC_SPI 229 
>> IRQ_TYPE_LEVEL_HIGH>,
>> +                                       <GIC_SPI 231 
>> IRQ_TYPE_LEVEL_HIGH>,
>> +                                       <GIC_SPI 364 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 365 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 366 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 367 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 368 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 369 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 370 
>> IRQ_TYPE_EDGE_RISING>,
>> +                                       <GIC_SPI 371 
>> IRQ_TYPE_EDGE_RISING>;
>> +                       clocks = <&gcc GCC_GPU_MEMNOC_GFX_CLK>,
>> +                               <&gcc GCC_GPU_CFG_AHB_CLK>,
>> +                               <&gcc GCC_DDRSS_GPU_AXI_CLK>;
>> +
>> +                       clock-names = "bus", "iface", "mem_iface_clk";
> 
> Repeated comment from v2 feedback:
> 
> Please send a patch to:
> 
> Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> 
> ...adding 'qcom,sc7180-smmu-v2'.  If you do this it will point out
> that you've added a new clock: "mem_iface_clk".  Is this truly a new
> clock in sc7180 compared to previous IOMMUs?  ...or is it not really
> needed?
I can confirm that this clock is needed for SC7180. I will send out a 
new patch
to update the documentation this week.
> 
> 
>> +               gmu: gmu@...a000 {
>> +                       compatible="qcom,adreno-gmu-618.0", 
>> "qcom,adreno-gmu";
>> +                       reg = <0 0x0506a000 0 0x31000>, <0 0x0b290000 
>> 0 0x10000>,
>> +                               <0 0x0b490000 0 0x10000>;
>> +                       reg-names = "gmu", "gmu_pdc", "gmu_pdc_seq";
>> +                       interrupts = <GIC_SPI 304 
>> IRQ_TYPE_LEVEL_HIGH>,
>> +                                  <GIC_SPI 305 IRQ_TYPE_LEVEL_HIGH>;
>> +                       interrupt-names = "hfi", "gmu";
>> +                       clocks = <&gpucc GPU_CC_CX_GMU_CLK>,
>> +                              <&gpucc GPU_CC_CXO_CLK>,
>> +                              <&gcc GCC_DDRSS_GPU_AXI_CLK>,
>> +                              <&gcc GCC_GPU_MEMNOC_GFX_CLK>;
>> +                       clock-names = "gmu", "cxo", "axi", "memnoc";
>> +                       power-domains = <&gpucc CX_GDSC>;
>> +                       power-domain-names = "cx";
> 
> As per continued comments on v2, please see if this works for you:
> 
>   power-domains = <&gpucc CX_GDSC>, <0>;
>   power-domain-names = "cx", "gx";
> 
> ...and work to get something more real for "gx" ASAP.  It did seem to
> boot for me and (unless someone disagrees) it seems better than
> totally leaving it out / violating the bindings?
> 
> 
> -Doug