linux-kernel - Re: [PATCH] PCI: qcom: Prevent GDSC power down on suspend

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Message-ID: <30e971d3-90ea-4f08-bc5b-ff25030130b6@oss.qualcomm.com>
Date: Wed, 28 Jan 2026 13:31:44 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Stanimir Varbanov <svarbanov@...sol.com>
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] PCI: qcom: Prevent GDSC power down on suspend

On 1/28/26 1:22 PM, Krishna Chaitanya Chundru wrote:
> Currently, the driver expects the devices to remain in D0 across system
> suspend, but the genpd framework may still power down the associated
> GDSC during suspend. When that happens, the PCIe link goes down and
> cannot be recovered on resume.
> 
> Prevent genpd from turning off the PCIe GDSC by using
> dev_pm_genpd_rpm_always_on() so that the power domain stays on while
> the controller is suspended. This preserves the link state across
> suspend/resume and avoids unrecoverable link failures.
> 
> Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---

How does this play along with your D3Cold series?

Is this patch supposed to be applied first?

Konrad