usb: cdnsp: fix issue with ZLP - added TD_SIZE = 1

Patch modifies the TD_SIZE in TRB before ZLP TRB.
The TD_SIZE in TRB before ZLP TRB must be set to 1 to force
processing ZLP TRB by controller.

cc: <stable@vger.kernel.org>
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20221115092218.421267-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
index 04dfcaa..2f29431 100644 (file)
--- a/drivers/usb/cdns3/cdnsp-ring.c
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -1763,10 +1763,15 @@ static u32 cdnsp_td_remainder(struct cdnsp_device *pdev,
                              int trb_buff_len,
                              unsigned int td_total_len,
                              struct cdnsp_request *preq,
-                             bool more_trbs_coming)
+                             bool more_trbs_coming,
+                             bool zlp)
 {
        u32 maxp, total_packet_count;
 
+       /* Before ZLP driver needs set TD_SIZE = 1. */
+       if (zlp)
+               return 1;
+
        /* One TRB with a zero-length data packet. */
        if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) ||
            trb_buff_len == td_total_len)
@@ -1960,7 +1965,8 @@ int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
                /* Set the TRB length, TD size, and interrupter fields. */
                remainder = cdnsp_td_remainder(pdev, enqd_len, trb_buff_len,
                                               full_len, preq,
-                                              more_trbs_coming);
+                                              more_trbs_coming,
+                                              zero_len_trb);
 
                length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) |
                        TRB_INTR_TARGET(0);
@@ -2025,7 +2031,7 @@ int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
 
        if (preq->request.length > 0) {
                remainder = cdnsp_td_remainder(pdev, 0, preq->request.length,
-                                              preq->request.length, preq, 1);
+                                              preq->request.length, preq, 1, 0);
 
                length_field = TRB_LEN(preq->request.length) |
                                TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0);
@@ -2226,7 +2232,7 @@ static int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
                /* Set the TRB length, TD size, & interrupter fields. */
                remainder = cdnsp_td_remainder(pdev, running_total,
                                               trb_buff_len, td_len, preq,
-                                              more_trbs_coming);
+                                              more_trbs_coming, 0);
 
                length_field = TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0);