linux-kernel - [PATCH v3 4/6] PCI: dwc: Add support for new pci function op

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Message-ID: <20241112-qps615_pwr-v3-4-29a1e98aa2b0@quicinc.com>
Date: Tue, 12 Nov 2024 20:31:36 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: <andersson@...nel.org>, 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>,
        Konrad Dybcio <konradybcio@...nel.org>,
        <cros-qcom-dts-watchers@...omium.org>,
        Jingoo Han <jingoohan1@...il.com>, Bartosz Golaszewski <brgl@...ev.pl>
CC: <quic_vbadigan@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Krishna chaitanya chundru
	<quic_krichai@...cinc.com>
Subject: [PATCH v3 4/6] PCI: dwc: Add support for new pci function op

Add the support for stop_link() and  start_link() function op.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 18 ++++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h      | 16 ++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 3e41865c7290..d7e7f782390a 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -691,10 +691,28 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn,
 }
 EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
 
+static int dw_pcie_op_start_link(struct pci_bus *bus)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	return dw_pcie_host_start_link(pci);
+}
+
+static void dw_pcie_op_stop_link(struct pci_bus *bus)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	dw_pcie_host_stop_link(pci);
+}
+
 static struct pci_ops dw_pcie_ops = {
 	.map_bus = dw_pcie_own_conf_map_bus,
 	.read = pci_generic_config_read,
 	.write = pci_generic_config_write,
+	.start_link = dw_pcie_op_start_link,
+	.stop_link = dw_pcie_op_stop_link,
 };
 
 static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 347ab74ac35a..b88b4edafcc3 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -433,6 +433,8 @@ 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 {
@@ -665,6 +667,20 @@ 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