[PATCH 4.9 132/152] usb: musb: da8xx: Fix host mode suspend

[Greg Kroah-Hartman]

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

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

From: Alexandre Bailon <abailon@xxxxxxxxxxxx>

[ Upstream commit 486fc20ac8391338a42b015801b846acda4db7b7 ]

On da8xx, VBUS is not maintained during suspend when musb is in host mode.
On resume, all the connected devices will be disconnected and then will
be enumerated again.
This happens because MUSB_DEVCTL is cleared during suspend.

Use the quirk MUSB_PRESERVE_SESSION to preseve MUSB_DEVCTL during suspend.

Signed-off-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
Signed-off-by: Bin Liu <b-liu@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/musb/da8xx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -434,7 +434,7 @@ static int da8xx_musb_exit(struct musb *
 }
 
 static const struct musb_platform_ops da8xx_ops = {
-	.quirks		= MUSB_INDEXED_EP,
+	.quirks		= MUSB_INDEXED_EP | MUSB_PRESERVE_SESSION,
 	.init		= da8xx_musb_init,
 	.exit		= da8xx_musb_exit,