linux-kernel - [PATCH 4.19 15/38] usb: dwc3: fix clock issue during resume in OTG mode

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Date:   Mon,  8 Feb 2021 16:01:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Gary Bisson <gary.bisson@...ndarydevices.com>
Subject: [PATCH 4.19 15/38] usb: dwc3: fix clock issue during resume in OTG mode

From: Gary Bisson <gary.bisson@...ndarydevices.com>

commit 0e5a3c8284a30f4c43fd81d7285528ece74563b5 upstream.

Commit fe8abf332b8f ("usb: dwc3: support clocks and resets for DWC3
core") introduced clock support and a new function named
dwc3_core_init_for_resume() which enables the clock before calling
dwc3_core_init() during resume as clocks get disabled during suspend.

Unfortunately in this commit the DWC3_GCTL_PRTCAP_OTG case was forgotten
and therefore during resume, a platform could call dwc3_core_init()
without re-enabling the clocks first, preventing to resume properly.

So update the resume path to call dwc3_core_init_for_resume() as it
should.

Fixes: fe8abf332b8f ("usb: dwc3: support clocks and resets for DWC3 core")
Cc: stable@...r.kernel.org
Signed-off-by: Gary Bisson <gary.bisson@...ndarydevices.com>
Link: https://lore.kernel.org/r/20210125161934.527820-1-gary.bisson@boundarydevices.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1700,7 +1700,7 @@ static int dwc3_resume_common(struct dwc
 		if (PMSG_IS_AUTO(msg))
 			break;

-		ret = dwc3_core_init(dwc);
+		ret = dwc3_core_init_for_resume(dwc);
 		if (ret)
 			return ret;