linux-kernel - Re: [RFC,v14 4/5] arm64: tegra: Add PCIe port node with PCIe WAKE# for C1 controller

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Date:   Wed, 8 Feb 2023 17:43:35 +0530
From:   Manikanta Maddireddy <mmaddireddy@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     bhelgaas@...gle.com, petlozup@...dia.com,
        rafael.j.wysocki@...el.com, lpieralisi@...nel.org, robh@...nel.org,
        jeffy.chen@...k-chips.com, krzysztof.kozlowski+dt@...aro.org,
        jonathanh@...dia.com, dmitry.osipenko@...labora.com,
        viresh.kumar@...aro.org, gregkh@...uxfoundation.org,
        steven.price@....com, kw@...ux.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        vidyas@...dia.com
Subject: Re: [RFC,v14 4/5] arm64: tegra: Add PCIe port node with PCIe WAKE#
 for C1 controller


On 2/8/2023 5:07 PM, Thierry Reding wrote:
> On Wed, Feb 08, 2023 at 04:46:44PM +0530, Manikanta Maddireddy wrote:
>> Add PCIe port node under the PCIe controller-1 device tree node to support
>> PCIe WAKE# interrupt for WiFi.
>>
>> Signed-off-by: Manikanta Maddireddy <mmaddireddy@...dia.com>
>> ---
>>
>> Changes in v14:
>> New patch in the series to support PCIe WAKE# in NVIDIA Jetson AGX Orin.
>>
>>   .../dts/nvidia/tegra234-p3737-0000+p3701-0000.dts     | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts b/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
>> index 8a9747855d6b..9c89be263141 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
>> +++ b/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
>> @@ -2147,6 +2147,17 @@ pcie@...00000 {
>>   
>>   			phys = <&p2u_hsio_3>;
>>   			phy-names = "p2u-0";
>> +
>> +			pci@0,0 {
>> +				reg = <0x0000 0 0 0 0>;
>> +				#address-cells = <3>;
>> +				#size-cells = <2>;
>> +				ranges;
>> +
>> +				interrupt-parent = <&gpio>;
>> +				interrupts = <TEGRA234_MAIN_GPIO(L, 2) IRQ_TYPE_LEVEL_LOW>;
>> +				interrupt-names = "wakeup";
>> +			};
> Don't we need to wire this to the PMC interrupt controller and the wake
> event corresponding to the L2 GPIO? Otherwise none of the wake logic in
> PMC will get invoked.
>
> Thierry
PCIe wake is gpio based not pmc, only wake support is provided by PMC 
controller.
I verified this patch and able to wake up Tegra from suspend.
Petlozu, correct me if my understanding is wrong.


Manikanta