linux-kernel - Re: [PATCH 5/5] PCI: qcom: enable Link retain logic for Hamoa

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Message-ID: <woztsrvxwkgi34z3yop7nja6ojbxdboyzz5xpz4xlym75dtyja@iopi7hvw42v7>
Date: Fri, 9 Jan 2026 15:09:26 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jingoo Han <jingoohan1@...il.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>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 5/5] PCI: qcom: enable Link retain logic for Hamoa

On Fri, Jan 09, 2026 at 12:51:10PM +0530, Krishna Chaitanya Chundru wrote:
> The Hamoa platform supports keeping the PCIe link active across
> bootloader and kernel handoff. To take advantage of this, introduce a
> specific configuration (cfg_x1e80100) with link_retain = true and
> update the device match table to use it.

Why are we enabling it only for this platform?

> 
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index bdd5bdb462c5f6814c8311be96411173456b6b14..975671a0dd4757074600d5a0966e94220bb18d8c 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1531,6 +1531,12 @@ static const struct qcom_pcie_cfg cfg_sc8280xp = {
>  	.no_l0s = true,
>  };
>  
> +static const struct qcom_pcie_cfg cfg_x1e80100 = {
> +	.ops = &ops_1_21_0,
> +	.no_l0s = true,
> +	.link_retain = true,
> +};
> +
>  static const struct qcom_pcie_cfg cfg_fw_managed = {
>  	.firmware_managed = true,
>  };
> @@ -2168,7 +2174,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-sm8450-pcie0", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
> -	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_sc8280xp },
> +	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_x1e80100 },
>  	{ }
>  };
>  
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry