linux-kernel - [PATCH v6 2/5] PCI: dwc: Add wakeup host op to pci_epc

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Message-ID: <20240710-wakeup_host-v6-2-ef00f31ea38d@quicinc.com>
Date: Wed, 10 Jul 2024 16:46:09 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I
	<kishon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jonathan Corbet
	<corbet@....net>,
        Jingoo Han <jingoohan1@...il.com>,
        Lorenzo Pieralisi
	<lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <mhi@...ts.linux.dev>, <quic_vbadigan@...cinc.com>,
        <quic_ramkri@...cinc.com>, <quic_nitegupt@...cinc.com>,
        <quic_skananth@...cinc.com>, <quic_parass@...cinc.com>,
        "Krishna chaitanya
 chundru" <quic_krichai@...cinc.com>
Subject: [PATCH v6 2/5] PCI: dwc: Add wakeup host op to pci_epc_ops

Add wakeup host op to wake up host from D3cold or D3hot.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 12 ++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h    |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 43ba5c6738df..a20b6bec6078 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -440,6 +440,17 @@ dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 	return ep->ops->get_features(ep);
 }
 
+static bool dw_pcie_ep_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
+				   bool send_pme)
+{
+	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+
+	if (!ep->ops->wakeup_host)
+		return false;
+
+	return ep->ops->wakeup_host(ep, func_no, send_pme);
+}
+
 static const struct pci_epc_ops epc_ops = {
 	.write_header		= dw_pcie_ep_write_header,
 	.set_bar		= dw_pcie_ep_set_bar,
@@ -454,6 +465,7 @@ static const struct pci_epc_ops epc_ops = {
 	.start			= dw_pcie_ep_start,
 	.stop			= dw_pcie_ep_stop,
 	.get_features		= dw_pcie_ep_get_features,
+	.wakeup_host		= dw_pcie_ep_wakeup_host,
 };
 
 /**
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 53c4c8f399c8..da15ccd7a3f5 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -365,6 +365,7 @@ struct dw_pcie_ep_ops {
 	 */
 	unsigned int (*get_dbi_offset)(struct dw_pcie_ep *ep, u8 func_no);
 	unsigned int (*get_dbi2_offset)(struct dw_pcie_ep *ep, u8 func_no);
+	bool	(*wakeup_host)(struct dw_pcie_ep *ep, u8 func_no, bool send_pme);
 };
 
 struct dw_pcie_ep_func {

-- 
2.42.0