linux-kernel - [PATCH v4 04/10] PCI: dwc: Add host_start_link() & host_start

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Message-Id: <20250225-qps615_v4_1-v4-4-e08633a7bdf8@oss.qualcomm.com>
Date: Tue, 25 Feb 2025 15:04:01 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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>
Cc: quic_vbadigan@...cnic.com, amitk@...nel.org, dmitry.baryshkov@...aro.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,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH v4 04/10] PCI: dwc: Add host_start_link() &
 host_start_link() hooks for dwc glue drivers

Add host_start_link() and host_stop_link() functions to dwc glue drivers to
register with start_link() and stop_link() 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 | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 501d9ddfea16..47f34dd12c39 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -435,6 +435,8 @@ 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	(*host_start_link)(struct dw_pcie *pcie);
+	void	(*host_stop_link)(struct dw_pcie *pcie);
 };
 
 struct dw_pcie {
@@ -664,6 +666,20 @@ static inline void dw_pcie_stop_link(struct dw_pcie *pci)
 		pci->ops->stop_link(pci);
 }
 
+static inline int dw_pcie_host_start_link(struct dw_pcie *pci)
+{
+	if (pci->ops && pci->ops->host_start_link)
+		return pci->ops->host_start_link(pci);
+
+	return 0;
+}
+
+static inline void dw_pcie_host_stop_link(struct dw_pcie *pci)
+{
+	if (pci->ops && pci->ops->host_stop_link)
+		pci->ops->host_stop_link(pci);
+}
+
 static inline enum dw_pcie_ltssm dw_pcie_get_ltssm(struct dw_pcie *pci)
 {
 	u32 val;

-- 
2.34.1