[1/2] usb: musb: host: Fix SuperSpeed hub enumeration

Message ID 1391520486-26298-1-git-send-email-rogerq@ti.com
State Accepted
Commit 3c4653c1f62ea5f1706084090a5a3bcf3402dc8f
Headers show

Commit Message

Roger Quadros Feb. 4, 2014, 1:28 p.m.
From: Ajay Kumar Gupta <ajay.gupta@ti.com>

Disables PING on status phase of control transfer.
PING token is not mandatory in status phase of control transfer
and so some high speed USB devices don't support it. If such devices
are connected to MUSB then they would not respond to PING token
causing delayed or failed enumeration.

[Roger Q] Fixes enumeration issues with some Super-Speed USB hubs
e.g. Dlink DUB-1340

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
 drivers/usb/musb/musb_host.c | 3 +++
 1 file changed, 3 insertions(+)


diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ed45572..abb38c3 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1183,6 +1183,9 @@  irqreturn_t musb_h_ep0_irq(struct musb *musb)
+			/* disable ping token in status phase */
+			csr |= MUSB_CSR0_H_DIS_PING;
 			/* flag status stage */
 			musb->ep0_stage = MUSB_EP0_STATUS;