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usb: chipidea: otg: add a_alt_hnp_support response for B device 

This patch adds response to a_alt_hnp_support set feature request from legacy
A device, that is, B-device can provide a message to the user indicating that
the user needs to connect the B-device to an alternate port on the A-device.
A device sets this feature indicates to the B-device that it is connected
to an A-device port that is not capable of HNP, but that the A-device does have
an alternate port that is capable of HNP.

[Peter]
Without this patch, the OTG B device can't be enumerated on
non-HNP port at A device, see below log:
[    2.287464] usb 1-1: Dual-Role OTG device on non-HNP port
[    2.293105] usb 1-1: can't set HNP mode: -32
[    2.417422] usb 1-1: new high-speed USB device number 4 using ci_hdrc
[    2.460635] usb 1-1: Dual-Role OTG device on non-HNP port
[    2.466424] usb 1-1: can't set HNP mode: -32
[    2.587464] usb 1-1: new high-speed USB device number 5 using ci_hdrc
[    2.630649] usb 1-1: Dual-Role OTG device on non-HNP port
[    2.636436] usb 1-1: can't set HNP mode: -32
[    2.641003] usb usb1-port1: unable to enumerate USB device

Cc: stable <stable@vger.kernel.org>
Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Jun 2015-03-08 16:05:01 +08:00 committed by Greg Kroah-Hartman
parent c526c216fe
commit d20f780799
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/chipidea/udc.c
View File

@ -929,6 +929,13 @@ __acquires(hwep->lock)
return retval; return retval;
} }
static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
{
dev_warn(&ci->gadget.dev,
"connect the device to an alternate port if you want HNP\n");
return isr_setup_status_phase(ci);
}
/** /**
* isr_setup_packet_handler: setup packet handler * isr_setup_packet_handler: setup packet handler
* @ci: UDC descriptor * @ci: UDC descriptor
@ -1061,6 +1068,10 @@ __acquires(ci->lock)
ci); ci);
} }
break; break;
case USB_DEVICE_A_ALT_HNP_SUPPORT:
if (ci_otg_is_fsm_mode(ci))
err = otg_a_alt_hnp_support(ci);
break;
default: default:
goto delegate; goto delegate;
} }