linux-kernel - [PATCH v3 1/5] usb: dwc3: core: Host wake up support from system suspend

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Message-Id: <1601376452-31839-2-git-send-email-sanm@codeaurora.org>
Date:   Tue, 29 Sep 2020 16:17:28 +0530
From:   Sandeep Maheswaram <sanm@...eaurora.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manu Gautam <mgautam@...eaurora.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>
Subject: [PATCH v3 1/5] usb: dwc3: core: Host wake up support from system suspend

Avoiding phy powerdown in host mode so that it can be wake up by devices.
Added hs_phy_flags and ss_phy_flags to check connection status and
set phy mode and configure interrupts.

Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
---
 drivers/usb/dwc3/core.c | 14 +++-----------
 drivers/usb/dwc3/core.h |  3 +++
 2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 385262f..c32ed10 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1663,10 +1663,6 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
 		dwc3_core_exit(dwc);
 		break;
 	case DWC3_GCTL_PRTCAP_HOST:
-		if (!PMSG_IS_AUTO(msg)) {
-			dwc3_core_exit(dwc);
-			break;
-		}
 
 		/* Let controller to suspend HSPHY before PHY driver suspends */
 		if (dwc->dis_u2_susphy_quirk ||
@@ -1724,13 +1720,9 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
 		spin_unlock_irqrestore(&dwc->lock, flags);
 		break;
 	case DWC3_GCTL_PRTCAP_HOST:
-		if (!PMSG_IS_AUTO(msg)) {
-			ret = dwc3_core_init_for_resume(dwc);
-			if (ret)
-				return ret;
-			dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
-			break;
-		}
+
+		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
+
 		/* Restore GUSB2PHYCFG bits that were modified in suspend */
 		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 		if (dwc->dis_u2_susphy_quirk)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 83b6c87..cd385a8 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1096,6 +1096,9 @@ struct dwc3 {
 
 	bool			phys_ready;
 
+	unsigned int            hs_phy_flags;
+	unsigned int            ss_phy_flags;
+
 	struct ulpi		*ulpi;
 	bool			ulpi_ready;
 
-- 
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