linux-kernel - [PATCH v18 9/9] usb: dwc3: qcom: Add multiport suspend/resume support for wrapper

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Message-ID: <20240326113253.3010447-10-quic_kriskura@quicinc.com>
Date: Tue, 26 Mar 2024 17:02:53 +0530
From: Krishna Kurapati <quic_kriskura@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring
	<robh@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
        Wesley Cheng
	<quic_wcheng@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Felipe Balbi
	<balbi@...nel.org>, Johan Hovold <johan@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_ppratap@...cinc.com>, <quic_jackp@...cinc.com>,
        Krishna Kurapati
	<quic_kriskura@...cinc.com>,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v18 9/9] usb: dwc3: qcom: Add multiport suspend/resume support for wrapper

Power event IRQ is used for wakeup in cases:
a) where the controller is super speed capable and missing an
ss_phy interrupt.
b) where the GIC is not capable of detecting DP/DM hs phy irq's.

Power event IRQ stat register indicates whether high speed phy
entered and exited L2 successfully during suspend and resume.
Indicate the same for all ports of multiport.

Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 12182e0f8f45..d3e6d5d5e8bf 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -52,6 +52,13 @@
 #define APPS_USB_AVG_BW 0
 #define APPS_USB_PEAK_BW MBps_to_icc(40)
 
+static const u32 pwr_evnt_irq_stat_reg[DWC3_MAX_PORTS] = {
+	0x58,
+	0x1dc,
+	0x228,
+	0x238,
+};
+
 struct dwc3_qcom_port {
 	int			qusb2_phy_irq;
 	int			dp_hs_phy_irq;
@@ -421,9 +428,11 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 	if (qcom->is_suspended)
 		return 0;
 
-	val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
-	if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
-		dev_err(qcom->dev, "HS-PHY not in L2\n");
+	for (i = 0; i < qcom->num_ports; i++) {
+		val = readl(qcom->qscratch_base + pwr_evnt_irq_stat_reg[i]);
+		if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
+			dev_err(qcom->dev, "port-%d HS-PHY not in L2\n", i + 1);
+	}
 
 	for (i = qcom->num_clocks - 1; i >= 0; i--)
 		clk_disable_unprepare(qcom->clks[i]);
@@ -472,8 +481,11 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
 		dev_warn(qcom->dev, "failed to enable interconnect: %d\n", ret);
 
 	/* Clear existing events from PHY related to L2 in/out */
-	dwc3_qcom_setbits(qcom->qscratch_base, PWR_EVNT_IRQ_STAT_REG,
-			  PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
+	for (i = 0; i < qcom->num_ports; i++) {
+		dwc3_qcom_setbits(qcom->qscratch_base,
+				  pwr_evnt_irq_stat_reg[i],
+				  PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
+	}
 
 	qcom->is_suspended = false;
 
-- 
2.34.1