linux-kernel - [PATCH v7 5/8] PCI: dwc: Implement .assert

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Message-Id: <20251029-qps615_v4_1-v7-5-68426de5844a@oss.qualcomm.com>
Date: Wed, 29 Oct 2025 16:59:58 +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 5/8] PCI: dwc: Implement .assert_perst() hook

Implement assert_perst() function op for dwc drivers.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index e92513c5bda51bde3a7157033ddbd73afa370d78..a209701e8037039191fb6c61b83978d8f561f7a7 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -856,16 +856,35 @@ static void __iomem *dw_pcie_ecam_conf_map_bus(struct pci_bus *bus, unsigned int
 	return pci->dbi_base + where;
 }
 
+static int dw_pcie_op_assert_perst(struct pci_bus *bus, bool assert)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	return dw_pcie_assert_perst(pci, assert);
+}
+
+static int dw_pcie_ecam_op_assert_perst(struct pci_bus *bus, bool assert)
+{
+	struct pci_config_window *cfg = bus->sysdata;
+	struct dw_pcie_rp *pp = cfg->priv;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	return dw_pcie_assert_perst(pci, assert);
+}
+
 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,
+	.assert_perst = dw_pcie_op_assert_perst,
 };
 
 static struct pci_ops dw_pcie_ecam_ops = {
 	.map_bus = dw_pcie_ecam_conf_map_bus,
 	.read = pci_generic_config_read,
 	.write = pci_generic_config_write,
+	.assert_perst = dw_pcie_ecam_op_assert_perst,
 };
 
 static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)

-- 
2.34.1