Eric Lee / linux-smarc-t335x-v3.2

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Commit 70b1e9ea8c724997f9b9f0b2aed46799eddc686c

Authored by Ravi B
Committed by Ajay Kumar Gupta
1 parent c9c405dd9e
Exists in master

usb: musb: Fix for handling overcurrent condition in host mode 

The overcurrent situation can occur in 2 scenarios
a) when usb device connected directly to musb root-port and device draw the
more current, further the VBUS_ERROR is generated and root-hub port change
status need to be notified to hub driver to handle over-current situation.
b) when usb device connected thrugh HUB, the hub status change will be
notified by hub through interrupt transfer and handled approperiately by HUB
driver.

This patch fixes (a), where root hub status change was not notified to hub driver.

Signed-off-by: Ravi B <ravibabu@ti.com>

Showing 1 changed file with 8 additions and 0 deletions Side-by-side Diff

drivers/usb/musb/musb_core.c
Diff comments   View file @ 70b1e9e
... ... @@ -571,6 +571,7 @@
571 571 }
572 572  
573 573 if (int_usb & MUSB_INTR_VBUSERROR) {
  574 + struct usb_hcd *hcd = musb_to_hcd(musb);
574 575 int ignore = 0;
575 576  
576 577 /* During connection as an A-Device, we may see a short
... ... @@ -610,6 +611,13 @@
610 611 musb->port1_status |=
611 612 USB_PORT_STAT_OVERCURRENT
612 613 | (USB_PORT_STAT_C_OVERCURRENT << 16);
  614 +
  615 + if (hcd->status_urb)
  616 + usb_hcd_poll_rh_status(hcd);
  617 + else
  618 + usb_hcd_resume_root_hub(hcd);
  619 +
  620 + MUSB_HST_MODE(musb);
613 621 }
614 622 break;
615 623 default: