[PATCH v3 4/4] PCI: qcom: enable Link retain logic for Hamoa

From: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
To: "Vinod Koul" <vkoul@kernel.org>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Manivannan Sadhasivam" <mani@kernel.org>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>
Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>,
	Qiang Yu <qiang.yu@oss.qualcomm.com>
Subject: [PATCH v3 4/4] PCI: qcom: enable Link retain logic for Hamoa
Date: Thu, 09 Jul 2026 12:05:19 +0530	[thread overview]
Message-ID: <20260709-link_retain-v3-4-81a9d187bb61@oss.qualcomm.com> (raw)
In-Reply-To: <20260709-link_retain-v3-0-81a9d187bb61@oss.qualcomm.com>

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.

Tested-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.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 77d2d989e9da..0b345a16f4cf 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1671,6 +1671,12 @@ 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,
 };
@@ -2370,7 +2376,7 @@ 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


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