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authorAjay Kumar Gupta <ajay.gupta@ti.com>2014-02-04 15:28:06 +0200
committerFelipe Balbi <balbi@ti.com>2014-02-18 10:32:23 -0600
commit3c4653c1f62ea5f1706084090a5a3bcf3402dc8f (patch)
tree10dcf56ecc0504b6e54fe2b5c3f31f3c48bf8adc
parent30a70b026b4cde4e51989661ff3bd0ede08d9646 (diff)
downloadblackbird-op-linux-3c4653c1f62ea5f1706084090a5a3bcf3402dc8f.tar.gz
blackbird-op-linux-3c4653c1f62ea5f1706084090a5a3bcf3402dc8f.zip
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>
-rw-r--r--drivers/usb/musb/musb_host.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ed455724017b..abb38c3833ef 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)
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;
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