linux-kernel - [PATCH RFC v1 2/3] pci: dwc: Add wakeup host op to pci_epc

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Date:   Wed, 14 Jun 2023 20:30:48 +0530
From:   Krishna chaitanya chundru <quic_krichai@...cinc.com>
To:     manivannan.sadhasivam@...aro.org
Cc:     quic_vbadigan@...cinc.com, quic_ramkri@...cinc.com,
        linux-arm-msm@...r.kernel.org, konrad.dybcio@...aro.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci@...r.kernel.org (open list:PCI DRIVER FOR SYNOPSYS DESIGNWARE),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH RFC v1 2/3] 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 | 11 +++++++++++
 drivers/pci/controller/dwc/pcie-designware.h    |  2 ++
 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 f9182f8..60cc323 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -463,6 +463,16 @@ dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 	return ep->ops->get_features(ep);
 }
 
+static int dw_pcie_ep_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
+{
+	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+
+	if (!ep->ops->wakeup_host)
+		return -EINVAL;
+
+	return ep->ops->wakeup_host(ep, func_no);
+}
+
 static const struct pci_epc_ops epc_ops = {
 	.write_header		= dw_pcie_ep_write_header,
 	.set_bar		= dw_pcie_ep_set_bar,
@@ -477,6 +487,7 @@ 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,
 };
 
 int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 79713ce..e338591 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -330,6 +330,8 @@ struct dw_pcie_ep_ops {
 	 * driver.
 	 */
 	unsigned int (*func_conf_select)(struct dw_pcie_ep *ep, u8 func_no);
+
+	int	(*wakeup_host)(struct dw_pcie_ep *ep, u8 func_no);
 };
 
 struct dw_pcie_ep_func {
-- 
2.7.4