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Commit 61c0e23d authored by Bar Weiner's avatar Bar Weiner
Browse files

usb: dwc3-msm: Expose functions for dbm ep reset in lpm 



USB suspend/resume sequence requires a DBM EP
reset. This commit add the support for resetting
the DBM EP which is linked to a given USB EP. In addition,
it adds the necessary functionality to query the DBM as to
whether the DBM EP reset is necessary.

Change-Id: I18449b3584ff82a638d9cd413cb7d8e825b92f99
Signed-off-by: default avatarDov Levenglick <dovl@codeaurora.org>
Signed-off-by: default avatarBar Weiner <bweiner@codeaurora.org>
parent 2b979b24

drivers/usb/dwc3/dwc3-msm.c

+80 −5
Original line number Diff line number Diff line
@@ -405,9 +405,12 @@ static void dwc3_msm_req_complete_func(struct usb_ep *ep, 


	/*

	 * If this is the last endpoint we unconfigured, than reset also

	 * the event buffers.

	 * the event buffers; unless unconfiguring the ep due to lpm,

	 * in which case the event buffer only gets reset during the

	 * block reset.

	 */

	if (0 == dbm_get_num_of_eps_configured(mdwc->dbm))

	if (0 == dbm_get_num_of_eps_configured(mdwc->dbm) &&

		!dbm_reset_ep_after_lpm(mdwc->dbm))

			dbm_event_buffer_config(mdwc->dbm, 0, 0, 0);



	/*
@@ -421,6 +424,65 @@ static void dwc3_msm_req_complete_func(struct usb_ep *ep, 
	kfree(req_complete);

}





/**

* Helper function

*

* Reset  DBM endpoint.

*

* @mdwc - pointer to dwc3_msm instance.

* @dep - pointer to dwc3_ep instance.

*

* @return int - 0 on success, negative on error.

*/

static int __dwc3_msm_dbm_ep_reset(struct dwc3_msm *mdwc, struct dwc3_ep *dep)

{

	int ret;



	dev_dbg(mdwc->dev, "Resetting dbm endpoint %d\n", dep->number);



	/* Reset the dbm endpoint */

	ret = dbm_ep_soft_reset(mdwc->dbm, dep->number, true);

	if (ret) {

		dev_err(mdwc->dev, "%s: failed to assert dbm ep reset\n",

				__func__);

		return ret;

	}



	/*

	 * 10 usec delay is required before deasserting DBM endpoint reset

	 * according to hardware programming guide.

	 */

	udelay(10);

	ret = dbm_ep_soft_reset(mdwc->dbm, dep->number, false);

	if (ret) {

		dev_err(mdwc->dev, "%s: failed to deassert dbm ep reset\n",

				__func__);

		return ret;

	}



	return 0;

}



/**

* Reset the DBM endpoint which is linked to the given USB endpoint.

*

* @usb_ep - pointer to usb_ep instance.

*

* @return int - 0 on success, negative on error.

*/



int msm_dwc3_reset_dbm_ep(struct usb_ep *ep)

{

	struct dwc3_ep *dep = to_dwc3_ep(ep);

	struct dwc3 *dwc = dep->dwc;

	struct dwc3_msm *mdwc = dev_get_drvdata(dwc->dev->parent);



	return __dwc3_msm_dbm_ep_reset(mdwc, dep);

}

EXPORT_SYMBOL(msm_dwc3_reset_dbm_ep);





/**

* Helper function.

* See the header of the dwc3_msm_ep_queue function.
@@ -625,6 +687,7 @@ static int dwc3_msm_ep_queue(struct usb_ep *ep, 
	return 0;

}





/**

 * Configure MSM endpoint.

 * This function do specific configurations
@@ -666,8 +729,6 @@ int msm_ep_config(struct usb_ep *ep) 
	}

	(*new_ep_ops) = (*ep->ops);

	new_ep_ops->queue = dwc3_msm_ep_queue;

	new_ep_ops->disable = ep->ops->disable;



	ep->ops = new_ep_ops;



	/*
@@ -805,6 +866,20 @@ int msm_register_usb_ext_notification(struct usb_ext_notification *info) 
}

EXPORT_SYMBOL(msm_register_usb_ext_notification);



/*

 * Check whether the DWC3 requires resetting the ep

 * after going to Low Power Mode (lpm)

 */

bool msm_dwc3_reset_ep_after_lpm(struct usb_gadget *gadget)

{

	struct dwc3 *dwc = container_of(gadget, struct dwc3, gadget);

	struct dwc3_msm *mdwc = dev_get_drvdata(dwc->dev->parent);



	return dbm_reset_ep_after_lpm(mdwc->dbm);

}

EXPORT_SYMBOL(msm_dwc3_reset_ep_after_lpm);





/*

 * Config Global Distributed Switch Controller (GDSC)

 * to support controller power collapse