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usb: cdnsp: fix lack of ZLP for ep0 

Patch implements the handling of ZLP for control transfer.
To send the ZLP driver must prepare the extra TRB in TD with
length set to zero and TRB type to TRB_NORMAL.
The first TRB must have set TRB_CHAIN flag, TD_SIZE = 1
and TRB type to TRB_DATA.

Fixes: 3d82904559 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
cc: <stable@vger.kernel.org>
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Link: https://lore.kernel.org/r/20221122085138.332434-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawel Laszczak 2022-11-22 03:51:38 -05:00 committed by Greg Kroah-Hartman
parent 57f8e00d8a
commit ae423ef5d0
1 changed files with 32 additions and 10 deletions
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42
drivers/usb/cdns3/cdnsp-ring.c
View File

@ -2006,10 +2006,11 @@ int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
{
u32 field, length_field, remainder;
u32 field, length_field, zlp = 0;
struct cdnsp_ep *pep = preq->pep;
struct cdnsp_ring *ep_ring;
int num_trbs;
u32 maxp;
int ret;
ep_ring = cdnsp_request_to_transfer_ring(pdev, preq);
@ -2019,26 +2020,33 @@ int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
/* 1 TRB for data, 1 for status */
num_trbs = (pdev->three_stage_setup) ? 2 : 1;
maxp = usb_endpoint_maxp(pep->endpoint.desc);
if (preq->request.zero && preq->request.length &&
(preq->request.length % maxp == 0)) {
num_trbs++;
zlp = 1;
}
ret = cdnsp_prepare_transfer(pdev, preq, num_trbs);
if (ret)
return ret;
/* If there's data, queue data TRBs */
if (pdev->ep0_expect_in)
field = TRB_TYPE(TRB_DATA) | TRB_IOC;
else
field = TRB_ISP | TRB_TYPE(TRB_DATA) | TRB_IOC;
if (preq->request.length > 0) {
remainder = cdnsp_td_remainder(pdev, 0, preq->request.length,
preq->request.length, preq, 1, 0);
field = TRB_TYPE(TRB_DATA);
length_field = TRB_LEN(preq->request.length) |
TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0);
if (zlp)
field |= TRB_CHAIN;
else
field |= TRB_IOC | (pdev->ep0_expect_in ? 0 : TRB_ISP);
if (pdev->ep0_expect_in)
field |= TRB_DIR_IN;
length_field = TRB_LEN(preq->request.length) |
TRB_TD_SIZE(zlp) | TRB_INTR_TARGET(0);
cdnsp_queue_trb(pdev, ep_ring, true,
lower_32_bits(preq->request.dma),
upper_32_bits(preq->request.dma), length_field,
@ -2046,6 +2054,20 @@ int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
TRB_SETUPID(pdev->setup_id) |
pdev->setup_speed);
if (zlp) {
field = TRB_TYPE(TRB_NORMAL) | TRB_IOC;
if (!pdev->ep0_expect_in)
field = TRB_ISP;
cdnsp_queue_trb(pdev, ep_ring, true,
lower_32_bits(preq->request.dma),
upper_32_bits(preq->request.dma), 0,
field | ep_ring->cycle_state |
TRB_SETUPID(pdev->setup_id) |
pdev->setup_speed);
}
pdev->ep0_stage = CDNSP_DATA_STAGE;
}