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Commit cf77b5fb authored by Vahram Aharonyan's avatar Vahram Aharonyan Committed by Felipe Balbi
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usb: dwc2: gadget: Transfer length limit checking for DDMA 



Add dwc2_gadget_get_chain_limit() function and its call in transfer
start routine to correctly estimate one go on transfer size if
descriptor DMA mode is selected.

Signed-off-by: default avatarVahram Aharonyan <vahrama@synopsys.com>
Signed-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 3a1ec351

drivers/usb/dwc2/gadget.c

+31 −1
Original line number Diff line number Diff line
@@ -601,6 +601,32 @@ static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg) 
	return dsts;

}



/**

 * dwc2_gadget_get_chain_limit - get the maximum data payload value of the

 * DMA descriptor chain prepared for specific endpoint

 * @hs_ep: The endpoint

 *

 * Return the maximum data that can be queued in one go on a given endpoint

 * depending on its descriptor chain capacity so that transfers that

 * are too long can be split.

 */

static unsigned int dwc2_gadget_get_chain_limit(struct dwc2_hsotg_ep *hs_ep)

{

	int is_isoc = hs_ep->isochronous;

	unsigned int maxsize;



	if (is_isoc)

		maxsize = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_LIMIT :

					   DEV_DMA_ISOC_RX_NBYTES_LIMIT;

	else

		maxsize = DEV_DMA_NBYTES_LIMIT;



	/* Above size of one descriptor was chosen, multiple it */

	maxsize *= MAX_DMA_DESC_NUM_GENERIC;



	return maxsize;

}



/**

 * dwc2_hsotg_start_req - start a USB request from an endpoint's queue

 * @hsotg: The controller state.
@@ -659,7 +685,11 @@ static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg, 
	dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n",

		ureq->length, ureq->actual);



	if (!using_desc_dma(hsotg))

		maxreq = get_ep_limit(hs_ep);

	else

		maxreq = dwc2_gadget_get_chain_limit(hs_ep);



	if (length > maxreq) {

		int round = maxreq % hs_ep->ep.maxpacket;