linux-kernel - Re: [PATCH v2] arm64: dts: sdm845: add video nodes

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Date:   Thu, 20 Dec 2018 13:16:21 +0530
From:   mgottam@...eaurora.org
To:     Alexandre Courbot <acourbot@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>, david.brown@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH v2] arm64: dts: sdm845: add video nodes

On 2018-11-30 12:09, Alexandre Courbot wrote:
> On Wed, Nov 28, 2018 at 10:12 PM Malathi Gottam 
> <mgottam@...eaurora.org> wrote:
>> 
>> This adds video nodes to sdm845 based on the examples
>> in the bindings.
>> 
>> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 35 
>> +++++++++++++++++++++++++++++++++++
>>  1 file changed, 35 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi 
>> b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> index 0c9a2aa..4c9d6a4 100644
>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> @@ -84,6 +84,11 @@
>>                         reg = <0 0x86200000 0 0x2d00000>;
>>                         no-map;
>>                 };
>> +
>> +               venus_region: memory@...00000 {
>> +                       reg = <0x0 0x95800000 0x0 0x500000>;
> 
> This patch depends on the firmware loader being fixed to not expect a
> 6MB area size. I think you can do it as follows:
> 

For now, we are proceeding on adding node with memory region as 6MB.
Once we have the other patch for fixing firmware loader merged,
we can then try on recording the reserved area size.

I am posting updated patch with hard coded memory region.

Regards,
Malathi.

> 1) Record the reserved area size in the venus_core structure during
> venus_load_fw(),
> 2) Use that area size in place of VENUS_FW_MEM_SIZE everywhere else in 
> the code.
> 
> That way we don't put any artificial limitation on the expected
> firmware size, or on the reserved area in the DT matching a hardcoded
> size.
> 
> Once you have this, the driver should work no matter what the size of
> the reserved area is, provided the firmware first into it.
> 
>> +                       no-map;
>> +               };
>>         };
>> 
>>         cpus {
>> @@ -1103,5 +1108,35 @@
>>                                 status = "disabled";
>>                         };
>>                 };
>> +
>> +               video-codec@...0000 {
>> +                       compatible = "qcom,sdm845-venus";
>> +                       reg = <0x0aa00000 0xff000>;
>> +                       interrupts = <GIC_SPI 174 
>> IRQ_TYPE_LEVEL_HIGH>;
>> +                       power-domains = <&videocc VENUS_GDSC>;
>> +                       clocks = <&videocc 
>> VIDEO_CC_VENUS_CTL_CORE_CLK>,
>> +                                <&videocc VIDEO_CC_VENUS_AHB_CLK>,
>> +                                <&videocc 
>> VIDEO_CC_VENUS_CTL_AXI_CLK>;
>> +                       clock-names = "core", "iface", "bus";
>> +                       iommus = <&apps_smmu 0x10a0 0x8>,
>> +                                <&apps_smmu 0x10b0 0x0>;
>> +                       memory-region = <&venus_region>;
>> +
>> +                       video-core0 {
>> +                               compatible = "venus-decoder";
>> +                               clocks = <&videocc 
>> VIDEO_CC_VCODEC0_CORE_CLK>,
>> +                                        <&videocc 
>> VIDEO_CC_VCODEC0_AXI_CLK>;
>> +                               clock-names = "core", "bus";
>> +                               power-domains = <&videocc 
>> VCODEC0_GDSC>;
>> +                       };
>> +
>> +                       video-core1 {
>> +                               compatible = "venus-encoder";
>> +                               clocks = <&videocc 
>> VIDEO_CC_VCODEC1_CORE_CLK>,
>> +                                        <&videocc 
>> VIDEO_CC_VCODEC1_AXI_CLK>;
>> +                               clock-names = "core", "bus";
>> +                               power-domains = <&videocc 
>> VCODEC1_GDSC>;
>> +                       };
> 
> We should probably have status = "disabled" here and enable this node
> on a per-board basis?
> 
> Also, shouldn't we define the firmware subnode here too?
> 
> Cheers,
> Alex.
>> --
>> 1.9.1
>>