linux-kernel - [PATCH v7 4/8] PCI: dwc: Add assert_perst() hook for dwc glue drivers

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Message-Id: <20251029-qps615_v4_1-v7-4-68426de5844a@oss.qualcomm.com>
Date: Wed, 29 Oct 2025 16:59:57 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        chaitanya chundru <quic_krichai@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, Jingoo Han <jingoohan1@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>
Cc: quic_vbadigan@...cnic.com, amitk@...nel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, jorge.ramirez@....qualcomm.com,
        linux-arm-kernel@...ts.infradead.org,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>
Subject: [PATCH v7 4/8] PCI: dwc: Add assert_perst() hook for dwc glue
 drivers

Add assert_perst() function hook for dwc glue drivers to register with
assert_perst() of pci ops, allowing for better control over the
link initialization and shutdown process.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-designware.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index e995f692a1ecd10130d3be3358827f801811387f..99a02f052e1c8410573ecd44340a9ba4f822e979 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -485,6 +485,7 @@ struct dw_pcie_ops {
 	enum dw_pcie_ltssm (*get_ltssm)(struct dw_pcie *pcie);
 	int	(*start_link)(struct dw_pcie *pcie);
 	void	(*stop_link)(struct dw_pcie *pcie);
+	int	(*assert_perst)(struct dw_pcie *pcie, bool assert);
 };
 
 struct debugfs_info {
@@ -787,6 +788,14 @@ static inline void dw_pcie_stop_link(struct dw_pcie *pci)
 		pci->ops->stop_link(pci);
 }
 
+static inline int dw_pcie_assert_perst(struct dw_pcie *pci, bool assert)
+{
+	if (pci->ops && pci->ops->assert_perst)
+		return pci->ops->assert_perst(pci, assert);
+
+	return 0;
+}
+
 static inline enum dw_pcie_ltssm dw_pcie_get_ltssm(struct dw_pcie *pci)
 {
 	u32 val;

-- 
2.34.1