Re: [PATCH 1/1] usb: chipidea: otg: gadget module load and unload support

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Hello


On 10/21/2015 12:23 PM, Peter Chen wrote:
From: Li Jun <B47624@xxxxxxxxxxxxx>

This patch is to support load and unload gadget driver in full OTG mode.

Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Cc: Jiada Wang <jiada_wang@xxxxxxxxxx>
(Peter: it fixes a bug that the unload/reload gadget driver can't work
  well at OTG FSM mode)
Cc: <stable@xxxxxxxxxxxxxxx> #v4.0+
---
  drivers/usb/chipidea/udc.c | 17 +++++++++++++++++
  1 file changed, 17 insertions(+)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index e19d8b8..67cfa04 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1755,6 +1755,22 @@ static int ci_udc_start(struct usb_gadget *gadget,
  	return retval;
  }

+static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
+{
+	if (!ci_otg_is_fsm_mode(ci))
+		return;
+
+	mutex_lock(&ci->fsm.lock);
+	if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
+		ci->fsm.a_bidl_adis_tmout = 1;
+		ci_hdrc_otg_fsm_start(ci);
+	} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
+		ci->fsm.protocol = PROTO_UNDEF;
+		ci->fsm.otg->state = OTG_STATE_UNDEFINED;
+	}
+	mutex_unlock(&ci->fsm.lock);
+}
+
  /**
   * ci_udc_stop: unregister a gadget driver
   */
@@ -1779,6 +1795,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
  	ci->driver = NULL;
  	spin_unlock_irqrestore(&ci->lock, flags);

+	ci_udc_stop_for_otg_fsm(ci);
  	return 0;
  }


I have confirmed this patch resolves my issue with gadget module load/unload
please feel free to add my Tested-by

Thanks,
Jiada
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