linux-kernel - [PATCH RFC v1 3/3] PCI: qcom: ep: Add wake up host op to dw_pcie_ep

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Message-Id: <1686754850-29817-4-git-send-email-quic_krichai@quicinc.com>
Date:   Wed, 14 Jun 2023 20:30:49 +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>,
        Manivannan Sadhasivam <mani@...nel.org>,
        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:PCIE ENDPOINT DRIVER FOR QUALCOMM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH RFC v1 3/3] PCI: qcom: ep: Add wake up host op to dw_pcie_ep_ops

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

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 34 +++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 5d146ec..916a138 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -91,6 +91,7 @@
 /* PARF_PM_CTRL register fields */
 #define PARF_PM_CTRL_REQ_EXIT_L1		BIT(1)
 #define PARF_PM_CTRL_READY_ENTR_L23		BIT(2)
+#define PARF_PM_CTRL_XMT_PME			BIT(4)
 #define PARF_PM_CTRL_REQ_NOT_ENTR_L1		BIT(5)
 
 /* PARF_MHI_CLOCK_RESET_CTRL fields */
@@ -794,10 +795,43 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep)
 		dw_pcie_ep_reset_bar(pci, bar);
 }
 
+static int qcom_pcie_ep_wakeup_host(struct dw_pcie_ep *ep, u8 func_no)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
+	struct device *dev = pci->dev;
+	u32 perst, dstate, val;
+
+	perst = gpiod_get_value(pcie_ep->reset);
+	/* Toggle wake GPIO when device is in D3 cold */
+	if (perst) {
+		dev_info(dev, "Device is in D3 cold toggling wake\n");
+		gpiod_set_value_cansleep(pcie_ep->wake, 1);
+		usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500);
+		gpiod_set_value_cansleep(pcie_ep->wake, 0);
+		return 0;
+	}
+
+	dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) &
+				   DBI_CON_STATUS_POWER_STATE_MASK;
+	if (dstate == 3) {
+		dev_info(dev, "Device is in D3 hot sending inband PME\n");
+		val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
+		val |= PARF_PM_CTRL_XMT_PME;
+		writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
+	} else {
+		dev_err(dev, "Device is not in D3 state wakeup is not supported\n");
+		return -EPERM;
+	}
+
+	return 0;
+}
+
 static const struct dw_pcie_ep_ops pci_ep_ops = {
 	.ep_init = qcom_pcie_ep_init,
 	.raise_irq = qcom_pcie_ep_raise_irq,
 	.get_features = qcom_pcie_epc_get_features,
+	.wakeup_host = qcom_pcie_ep_wakeup_host,
 };
 
 static int qcom_pcie_ep_probe(struct platform_device *pdev)
-- 
2.7.4