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Commit 7d5e650a authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: ep0: use immediate SETUP on TRB 



If we pass TRB's own address on bpl/bph fields, we can get our SETUP
packet as immediate data on the TRB itself, without having to allocate
extra memory for it.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 374a1020

drivers/usb/dwc3/core.h

+0 −4
Original line number Diff line number Diff line
@@ -760,12 +760,10 @@ struct dwc3_scratchpad_array { 


/**

 * struct dwc3 - representation of our controller

 * @ctrl_req: usb control request which is used for ep0

 * @ep0_trb: trb which is used for the ctrl_req

 * @ep0_bounce: bounce buffer for ep0

 * @zlp_buf: used when request->zero is set

 * @setup_buf: used while precessing STD USB requests

 * @ctrl_req_addr: dma address of ctrl_req

 * @ep0_trb: dma address of ep0_trb

 * @ep0_usb_req: dummy req used while handling STD USB requests

 * @ep0_bounce_addr: dma address of ep0_bounce
@@ -859,14 +857,12 @@ struct dwc3_scratchpad_array { 
 *                 increments or 0 to disable.

 */

struct dwc3 {

	struct usb_ctrlrequest	*ctrl_req;

	struct dwc3_trb		*ep0_trb;

	void			*bounce;

	void			*ep0_bounce;

	void			*zlp_buf;

	void			*scratchbuf;

	u8			*setup_buf;

	dma_addr_t		ctrl_req_addr;

	dma_addr_t		ep0_trb_addr;

	dma_addr_t		bounce_addr;

	dma_addr_t		ep0_bounce_addr;

drivers/usb/dwc3/ep0.c

+6 −5
Original line number Diff line number Diff line
@@ -283,7 +283,7 @@ void dwc3_ep0_out_start(struct dwc3 *dwc) 


	complete(&dwc->ep0_in_setup);



	dwc3_ep0_prepare_one_trb(dwc, 0, dwc->ctrl_req_addr, 8,

	dwc3_ep0_prepare_one_trb(dwc, 0, dwc->ep0_trb_addr, 8,

			DWC3_TRBCTL_CONTROL_SETUP, false);

	ret = dwc3_ep0_start_trans(dwc, 0);

	WARN_ON(ret < 0);
@@ -794,7 +794,7 @@ static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 
static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,

		const struct dwc3_event_depevt *event)

{

	struct usb_ctrlrequest *ctrl = dwc->ctrl_req;

	struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;

	int ret = -EINVAL;

	u32 len;
@@ -916,7 +916,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc, 


			dwc->ep0_next_event = DWC3_EP0_COMPLETE;



			dwc3_ep0_prepare_one_trb(dwc, epnum, dwc->ctrl_req_addr,

			dwc3_ep0_prepare_one_trb(dwc, epnum, dwc->ep0_trb_addr,

					0, DWC3_TRBCTL_CONTROL_DATA, false);

			ret = dwc3_ep0_start_trans(dwc, epnum);

			WARN_ON(ret < 0);
@@ -997,8 +997,9 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, 
	req->direction = !!dep->number;



	if (req->request.length == 0) {



		dwc3_ep0_prepare_one_trb(dwc, dep->number,

				dwc->ctrl_req_addr, 0,

				dwc->ep0_trb_addr, 0,

				DWC3_TRBCTL_CONTROL_DATA, false);

		ret = dwc3_ep0_start_trans(dwc, dep->number);

	} else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
@@ -1056,7 +1057,7 @@ static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) 
		: DWC3_TRBCTL_CONTROL_STATUS2;



	dwc3_ep0_prepare_one_trb(dwc, dep->number,

			dwc->ctrl_req_addr, 0, type, false);

			dwc->ep0_trb_addr, 0, type, false);

	return dwc3_ep0_start_trans(dwc, dep->number);

}

drivers/usb/dwc3/gadget.c

+12 −27
Original line number Diff line number Diff line
@@ -3144,27 +3144,19 @@ int dwc3_gadget_init(struct dwc3 *dwc) 


	dwc->irq_gadget = irq;



	dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),

			&dwc->ctrl_req_addr, GFP_KERNEL);

	if (!dwc->ctrl_req) {

		dev_err(dwc->dev, "failed to allocate ctrl request\n");

		ret = -ENOMEM;

		goto err0;

	}



	dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,

					  sizeof(*dwc->ep0_trb) * 2,

					  &dwc->ep0_trb_addr, GFP_KERNEL);

	if (!dwc->ep0_trb) {

		dev_err(dwc->dev, "failed to allocate ep0 trb\n");

		ret = -ENOMEM;

		goto err1;

		goto err0;

	}



	dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);

	if (!dwc->setup_buf) {

		ret = -ENOMEM;

		goto err2;

		goto err1;

	}



	dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
@@ -3173,20 +3165,20 @@ int dwc3_gadget_init(struct dwc3 *dwc) 
	if (!dwc->ep0_bounce) {

		dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");

		ret = -ENOMEM;

		goto err3;

		goto err2;

	}



	dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);

	if (!dwc->zlp_buf) {

		ret = -ENOMEM;

		goto err4;

		goto err3;

	}



	dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,

			&dwc->bounce_addr, GFP_KERNEL);

	if (!dwc->bounce) {

		ret = -ENOMEM;

		goto err5;

		goto err4;

	}



	init_completion(&dwc->ep0_in_setup);
@@ -3226,38 +3218,34 @@ int dwc3_gadget_init(struct dwc3 *dwc) 


	ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);

	if (ret)

		goto err6;

		goto err5;



	ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);

	if (ret) {

		dev_err(dwc->dev, "failed to register udc\n");

		goto err6;

		goto err5;

	}



	return 0;

err6:

err5:

	dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,

			dwc->bounce_addr);



err5:

err4:

	kfree(dwc->zlp_buf);



err4:

err3:

	dwc3_gadget_free_endpoints(dwc);

	dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,

			dwc->ep0_bounce, dwc->ep0_bounce_addr);



err3:

err2:

	kfree(dwc->setup_buf);



err2:

err1:

	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,

			dwc->ep0_trb, dwc->ep0_trb_addr);



err1:

	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),

			dwc->ctrl_req, dwc->ctrl_req_addr);



err0:

	return ret;

}
@@ -3280,9 +3268,6 @@ void dwc3_gadget_exit(struct dwc3 *dwc) 


	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,

			dwc->ep0_trb, dwc->ep0_trb_addr);



	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),

			dwc->ctrl_req, dwc->ctrl_req_addr);

}



int dwc3_gadget_suspend(struct dwc3 *dwc)