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usb: musb: only restore devctl when session was set in backup

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commit 84ac5d1140f716a616522f952734e850448d2556 upstream.

If the session bit was not set in the backup of devctl register,
restoring devctl would clear the session bit. Therefor, only restore
devctl register when the session bit was set in the backup.

This solves the device enumeration failure in otg mode exposed by commit
56f487c (PM / Runtime: Update last_busy in rpm_resume).

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2016-05-31 10:05:24 -05:00 committed by Greg Kroah-Hartman
parent 4fe6d4b48d
commit 089a2d8400
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/musb/musb_core.c
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@ -2401,7 +2401,8 @@ static void musb_restore_context(struct musb *musb)
musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
if (musb->context.devctl & MUSB_DEVCTL_SESSION)
musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
for (i = 0; i < musb->config->num_eps; ++i) {
struct musb_hw_ep *hw_ep;