linux-kernel - [PATCH v3 3/3] usb: dwc3: imx8mp: disable SS

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Message-Id: <20240904-dwc-mp-v3-3-319947736ec0@nxp.com>
Date: Wed, 04 Sep 2024 11:49:04 -0400
From: Frank Li <Frank.Li@....com>
To: Mathias Nyman <mathias.nyman@...el.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Thinh Nguyen <Thinh.Nguyen@...opsys.com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, jun.li@....com, 
 Frank Li <Frank.Li@....com>, Xu Yang <xu.yang_2@....com>
Subject: [PATCH v3 3/3] usb: dwc3: imx8mp: disable SS_CON and U3 wakeup for
 system sleep

From: Li Jun <jun.li@....com>

SS_CON and U3 wakeup need 'ref_clk' on. iMX8MP turn off it while system
sleep, So disable these wakeup source and only enable DP/DM wakeup source
for host mode.

Reviewed-by: Xu Yang <xu.yang_2@....com>
Signed-off-by: Li Jun <jun.li@....com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/usb/dwc3/dwc3-imx8mp.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
index bd6953246f42e..02159cd820a10 100644
--- a/drivers/usb/dwc3/dwc3-imx8mp.c
+++ b/drivers/usb/dwc3/dwc3-imx8mp.c
@@ -96,7 +96,8 @@ static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
 	writel(value, dwc3_imx->glue_base + USB_CTRL1);
 }
 
-static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
+static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx,
+				      pm_message_t msg)
 {
 	struct dwc3	*dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
 	u32		val;
@@ -106,12 +107,14 @@ static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
 
 	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 
-	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci)
-		val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
-		       USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
-	else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
+	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) {
+		val |= USB_WAKEUP_EN | USB_WAKEUP_DPDM_EN;
+		if (PMSG_IS_AUTO(msg))
+			val |= USB_WAKEUP_SS_CONN | USB_WAKEUP_U3_EN;
+	} else {
 		val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
 		       USB_WAKEUP_VBUS_SRC_SESS_VAL;
+	}
 
 	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 }
@@ -307,7 +310,7 @@ static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
 
 	/* Wakeup enable */
 	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
-		dwc3_imx8mp_wakeup_enable(dwc3_imx);
+		dwc3_imx8mp_wakeup_enable(dwc3_imx, msg);
 
 	dwc3_imx->pm_suspended = true;
 

-- 
2.34.1