linux-kernel - [PATCH v9 07/10] usb: dwc3: qcom: Add multiport suspend/resume support for wrapper

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Message-ID: <20230621043628.21485-8-quic_kriskura@quicinc.com>
Date:   Wed, 21 Jun 2023 10:06:25 +0530
From:   Krishna Kurapati <quic_kriskura@...cinc.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Johan Hovold <johan@...nel.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_pkondeti@...cinc.com>, <quic_ppratap@...cinc.com>,
        <quic_jackp@...cinc.com>, <quic_harshq@...cinc.com>,
        <ahalaney@...hat.com>, <quic_shazhuss@...cinc.com>,
        Krishna Kurapati <quic_kriskura@...cinc.com>
Subject: [PATCH v9 07/10] usb: dwc3: qcom: Add multiport suspend/resume support for wrapper

QCOM SoC SA8295P's tertiary quad port controller supports 2 HS+SS
ports and 2 HS only ports. Add support for configuring PWR_EVENT_IRQ's
for all the ports during suspend/resume.

Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
 drivers/usb/dwc3/dwc3-qcom.c | 48 +++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 3ab48a6925fe..699485a85233 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -37,7 +37,11 @@
 #define PIPE3_PHYSTATUS_SW			BIT(3)
 #define PIPE_UTMI_CLK_DIS			BIT(8)
 
-#define PWR_EVNT_IRQ_STAT_REG			0x58
+#define PWR_EVNT_IRQ1_STAT_REG			0x58
+#define PWR_EVNT_IRQ2_STAT_REG			0x1dc
+#define PWR_EVNT_IRQ3_STAT_REG			0x228
+#define PWR_EVNT_IRQ4_STAT_REG			0x238
+
 #define PWR_EVNT_LPM_IN_L2_MASK			BIT(4)
 #define PWR_EVNT_LPM_OUT_L2_MASK		BIT(5)
 
@@ -93,6 +97,13 @@ struct dwc3_qcom {
 	struct icc_path		*icc_path_apps;
 };
 
+static u32 pwr_evnt_irq_stat_reg_offset[4] = {
+	PWR_EVNT_IRQ1_STAT_REG,
+	PWR_EVNT_IRQ2_STAT_REG,
+	PWR_EVNT_IRQ3_STAT_REG,
+	PWR_EVNT_IRQ4_STAT_REG,
+};
+
 static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
 {
 	u32 reg;
@@ -417,17 +428,37 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
 	dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq[0], 0);
 }
 
+static u8 dwc3_qcom_get_port_info(struct dwc3_qcom *qcom)
+{
+	struct dwc3 __maybe_unused *dwc = platform_get_drvdata(qcom->dwc3);
+
+	if (dwc3_qcom_is_host(qcom))
+		return dwc->num_usb2_ports;
+
+	/*
+	 * If not in host mode, either dwc was not probed
+	 * or we are in device mode, either case checking for
+	 * only first pwr event irq would suffice.
+	 */
+
+	return 1;
+}
+
 static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 {
 	u32 val;
 	int i, ret;
+	u8 num_ports;
 
 	if (qcom->is_suspended)
 		return 0;
 
-	val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
-	if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
+	num_ports = dwc3_qcom_get_port_info(qcom);
+	for (i = 0; i < num_ports; i++) {
+		val = readl(qcom->qscratch_base + pwr_evnt_irq_stat_reg_offset[i]);
+		if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
 		dev_err(qcom->dev, "HS-PHY not in L2\n");
+	}
 
 	for (i = qcom->num_clocks - 1; i >= 0; i--)
 		clk_disable_unprepare(qcom->clks[i]);
@@ -452,12 +483,14 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 
 static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
 {
+	int num_ports;
 	int ret;
 	int i;
 
 	if (!qcom->is_suspended)
 		return 0;
 
+	num_ports = dwc3_qcom_get_port_info(qcom);
 	if (dwc3_qcom_is_host(qcom) && wakeup)
 		dwc3_qcom_disable_interrupts(qcom);
 
@@ -474,9 +507,12 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
 	if (ret)
 		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 < num_ports; i++) {
+		/* Clear existing events from PHY related to L2 in/out */
+		dwc3_qcom_setbits(qcom->qscratch_base,
+			pwr_evnt_irq_stat_reg_offset[i],
+			PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
+	}
 
 	qcom->is_suspended = false;
 
-- 
2.40.0