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Commit 0ed723e6 authored by Mayank Rana's avatar Mayank Rana Committed by Gerrit - the friendly Code Review server
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dwc3-msm: Add dwc3_msm_release_ss_lane() API 



DP driver needs to use both USB SS lane in some use case. Hence
to release USB SS lane, add dwc3_msm_release_ss_lane() API which
performs below operations:
i. Stop USB host mode
ii. Start USB host mode into high speed mode if USB host mode
was active.

dwc3_msm_release_ss_lane() API is blocking call, and will comeback
once above both operations are performed.

Change-Id: I56df606914a613bfe4b76298b0041a66fc74878d
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent e1007d06

drivers/usb/dwc3/dwc3-msm.c

+60 −0
Original line number Diff line number Diff line
@@ -150,6 +150,9 @@ 
#define DWC3_GEVNTADRHI_EVNTADRHI_GSI_IDX(n)	(n << 16)

#define DWC3_GEVENT_TYPE_GSI			0x3



/* BAM pipe mask */

#define MSM_PIPE_ID_MASK	(0x1F)



enum dbm_reg {

	DBM_EP_CFG,

	DBM_DATA_FIFO,
@@ -3738,6 +3741,63 @@ static void dwc3_init_dbm(struct dwc3_msm *mdwc) 
			"qcom,reset-ep-after-lpm-resume");

}



static void dwc3_start_stop_host(struct dwc3_msm *mdwc, bool start)

{

	struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);



	if (start) {

		dbg_log_string("start host mode");

		mdwc->id_state = DWC3_ID_GROUND;

		mdwc->vbus_active = false;

	} else {

		dbg_log_string("stop_host_mode started");

		mdwc->id_state = DWC3_ID_FLOAT;

		mdwc->vbus_active = false;

	}



	dwc3_ext_event_notify(mdwc);

	dbg_event(0xFF, "flush_work", 0);

	flush_work(&mdwc->resume_work);

	drain_workqueue(mdwc->sm_usb_wq);

	if (start)

		dbg_log_string("host mode started");

	else

		dbg_log_string("stop_host_mode completed");

}



int dwc3_msm_release_ss_lane(struct device *dev)

{

	struct dwc3_msm *mdwc = dev_get_drvdata(dev);

	struct dwc3 *dwc = NULL;



	if (mdwc == NULL) {

		dev_err(dev, "dwc3-msm is not initialized yet.\n");

		return -EAGAIN;

	}



	dwc = platform_get_drvdata(mdwc->dwc3);

	if (dwc == NULL) {

		dev_err(dev, "dwc3 controller is not initialized yet.\n");

		return -EAGAIN;

	}



	dbg_event(0xFF, "ss_lane_release", 0);

	if (mdwc->id_state != DWC3_ID_GROUND) {

		dbg_log_string("USB host mode is not active");

		return 0;

	}



	/* stop USB host mode */

	dwc3_start_stop_host(mdwc, false);



	/* restart USB host mode into high speed */

	dwc->maximum_speed = USB_SPEED_HIGH;

	dwc3_start_stop_host(mdwc, true);



	return 0;

}

EXPORT_SYMBOL(dwc3_msm_release_ss_lane);



static int dwc3_msm_probe(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node, *dwc3_node;

include/linux/usb/dwc3-msm.h

+3 −1
Original line number Diff line number Diff line
@@ -22,7 +22,6 @@ 
 * These bit fields are set by function drivers that wish to queue

 * usb_requests with sps/bam parameters.

 */

#define MSM_PIPE_ID_MASK		(0x1F)

#define MSM_TX_PIPE_ID_OFS		(16)

#define MSM_SPS_MODE			BIT(5)

#define MSM_IS_FINITE_TRANSFER		BIT(6)
@@ -121,6 +120,7 @@ int msm_data_fifo_config(struct usb_ep *ep, unsigned long addr, u32 size, 
	u8 dst_pipe_idx);

bool msm_dwc3_reset_ep_after_lpm(struct usb_gadget *gadget);

int msm_dwc3_reset_dbm_ep(struct usb_ep *ep);

int dwc3_msm_release_ss_lane(struct device *dev);

#else

static inline struct usb_ep *usb_ep_autoconfig_by_name(

		struct usb_gadget *gadget, struct usb_endpoint_descriptor *desc,
@@ -146,6 +146,8 @@ static inline bool msm_dwc3_reset_ep_after_lpm(struct usb_gadget *gadget) 
{ return false; }

static inline int msm_dwc3_reset_dbm_ep(struct usb_ep *ep)

{ return -ENODEV; }

static inline int dwc3_msm_release_ss_lane(struct device *dev)

{ return -ENODEV; }

#endif



#endif /* __LINUX_USB_DWC3_MSM_H */