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Message-Id: <20180528100212.742559751@linuxfoundation.org>
Date: Mon, 28 May 2018 12:01:07 +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>,
Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 093/268] usb: musb: fix enumeration after resume
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andreas Kemnade <andreas@...nade.info>
[ Upstream commit 17539f2f4f0b7fa906b508765c8ada07a1e45f52 ]
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: Sasha Levin <alexander.levin@...rosoft.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
@@ -2522,7 +2522,8 @@ static int musb_resume(struct device *de
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
- musb_start(musb);
+ musb_enable_interrupts(musb);
+ musb_platform_enable(musb);
return 0;
}
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