usb: musb: host: Fix SuperSpeed hub enumeration

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>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ed455724017b5767f6ad849961946d7ad7af3228..abb38c3833ef46a1f8041c8a5f95fa96138b1796 100644 (file)
--- 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)
                                csr = MUSB_CSR0_H_STATUSPKT
                                        | MUSB_CSR0_TXPKTRDY;
 
+                       /* disable ping token in status phase */
+                       csr |= MUSB_CSR0_H_DIS_PING;
+
                        /* flag status stage */
                        musb->ep0_stage = MUSB_EP0_STATUS;