linux-kernel - [PATCH v6 4/5] PCI: epf-mhi: Add wakeup host op

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Message-ID: <20240710-wakeup_host-v6-4-ef00f31ea38d@quicinc.com>
Date: Wed, 10 Jul 2024 16:46:11 +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 4/5] PCI: epf-mhi: Add wakeup host op

Add wakeup host op for MHI EPF.
If the D-state is in D3cold toggle wake signal, otherwise send PME.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/endpoint/functions/pci-epf-mhi.c | 11 +++++++++++
 include/linux/mhi_ep.h                       |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 6de9014e6e53..82fc52490324 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -708,6 +708,16 @@ static int pci_epf_mhi_dma_init(struct pci_epf_mhi *epf_mhi)
 	return ret;
 }
 
+static int pci_epf_mhi_wakeup_host(struct mhi_ep_cntrl *mhi_cntrl)
+{
+	struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
+	struct pci_epf *epf = epf_mhi->epf;
+	struct pci_epc *epc = epf->epc;
+
+	return pci_epc_wakeup_host(epc, epf->func_no, epf->vfunc_no,
+			(mhi_cntrl->dstate == PCI_D3cold) ? false : true);
+}
+
 static void pci_epf_mhi_dma_deinit(struct pci_epf_mhi *epf_mhi)
 {
 	destroy_workqueue(epf_mhi->dma_wq);
@@ -803,6 +813,7 @@ static int pci_epf_mhi_link_up(struct pci_epf *epf)
 	mhi_cntrl->unmap_free = pci_epf_mhi_unmap_free;
 	mhi_cntrl->read_sync = mhi_cntrl->read_async = pci_epf_mhi_iatu_read;
 	mhi_cntrl->write_sync = mhi_cntrl->write_async = pci_epf_mhi_iatu_write;
+	mhi_cntrl->wakeup_host = pci_epf_mhi_wakeup_host;
 	if (info->flags & MHI_EPF_USE_DMA) {
 		mhi_cntrl->read_sync = pci_epf_mhi_edma_read;
 		mhi_cntrl->write_sync = pci_epf_mhi_edma_write;
diff --git a/include/linux/mhi_ep.h b/include/linux/mhi_ep.h
index 7c9e5895ea2c..04646cf7782b 100644
--- a/include/linux/mhi_ep.h
+++ b/include/linux/mhi_ep.h
@@ -165,6 +165,7 @@ struct mhi_ep_cntrl {
 	int (*write_sync)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info);
 	int (*read_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info);
 	int (*write_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info);
+	int (*wakeup_host)(struct mhi_ep_cntrl *mhi_cntrl);
 
 	enum mhi_state mhi_state;
 

-- 
2.42.0