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authorBin Liu <b-liu@ti.com>2017-12-05 08:45:30 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-20 10:10:38 +0100
commitbed6119aa21b28f096880342f9e2445f9ad47b25 (patch)
treed0f5755bdc4d79c7af6ec65e88e8346dcfba7023
parentd094690cbed906ca96752cb94abed50fbf1cfaa3 (diff)
usb: musb: da8xx: fix babble condition handling
commit bd3486ded7a0c313a6575343e6c2b21d14476645 upstream. When babble condition happens, the musb controller might automatically turns off VBUS. On DA8xx platform, the controller generates drvvbus interrupt for turning off VBUS along with the babble interrupt. In this case, we should handle the babble interrupt first and recover from the babble condition. This change ignores the drvvbus interrupt if babble interrupt is also generated at the same time, so the babble recovery routine works properly. Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/musb/da8xx.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index df88123274ca..972bf4210189 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -305,7 +305,15 @@ static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
portstate(musb->port1_status |= USB_PORT_STAT_POWER);
del_timer(&otg_workaround);
- } else {
+ } else if (!(musb->int_usb & MUSB_INTR_BABBLE)){
+ /*
+ * When babble condition happens, drvvbus interrupt
+ * is also generated. Ignore this drvvbus interrupt
+ * and let babble interrupt handler recovers the
+ * controller; otherwise, the host-mode flag is lost
+ * due to the MUSB_DEV_MODE() call below and babble
+ * recovery logic will not called.
+ */
musb->is_active = 0;
MUSB_DEV_MODE(musb);
otg->default_a = 0;