linux-kernel - [PATCH 4.14 012/183] usb: musb: fix enumeration after resume

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Date:   Wed, 25 Apr 2018 12:33:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andreas Kemnade <andreas@...nade.info>,
        Tony Lindgren <tony@...mide.com>, Bin Liu <b-liu@...com>
Subject: [PATCH 4.14 012/183] usb: musb: fix enumeration after resume

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andreas Kemnade <andreas@...nade.info>

commit 17539f2f4f0b7fa906b508765c8ada07a1e45f52 upstream.

On dm3730 there are enumeration problems after resume.
Investigation led to the cause that the MUSB_POWER_SOFTCONN
bit is not set. If it was set before suspend (because it
was enabled via musb_pullup()), it is set in
musb_restore_context() so the pullup is enabled. But then
musb_start() is called which overwrites MUSB_POWER and
therefore disables MUSB_POWER_SOFTCONN, so no pullup is
enabled and the device is not enumerated.

So let's do a subset of what musb_start() does
in the same way as musb_suspend() does it. Platform-specific
stuff it still called as there might be some phy-related stuff
which needs to be enabled.
Also interrupts are enabled, as it was the original idea
of calling musb_start() in musb_resume() according to
Commit 6fc6f4b87cb3 ("usb: musb: Disable interrupts on suspend,
enable them on resume")

Signed-off-by: Andreas Kemnade <andreas@...nade.info>
Tested-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Bin Liu <b-liu@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/musb_core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2733,7 +2733,8 @@ static int musb_resume(struct device *de
 	if ((devctl & mask) != (musb->context.devctl & mask))
 		musb->port1_status = 0;

-	musb_start(musb);
+	musb_enable_interrupts(musb);
+	musb_platform_enable(musb);

 	spin_lock_irqsave(&musb->lock, flags);
 	error = musb_run_resume_work(musb);