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X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Oct 2022 06:07:28.3888 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4ed6c74c-dd65-48fa-572d-08dab1983396 X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9;Ip=[64.207.220.244];Helo=[wcmailrelayl01.cadence.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM12FT057.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR07MB5091 X-Proofpoint-ORIG-GUID: L4dSBQesf5cjdNbPipFvKuYuTFVz6a_0 X-Proofpoint-GUID: L4dSBQesf5cjdNbPipFvKuYuTFVz6a_0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-19_02,2022-10-19_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 impostorscore=0 adultscore=0 spamscore=0 bulkscore=0 clxscore=1011 priorityscore=1501 phishscore=0 lowpriorityscore=0 malwarescore=0 mlxlogscore=426 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210190033 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org 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: Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") Signed-off-by: Pawel Laszczak --- drivers/usb/cdns3/cdnsp-ring.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c index 794e413800ae..4809d0e894bb 100644 --- a/drivers/usb/cdns3/cdnsp-ring.c +++ b/drivers/usb/cdns3/cdnsp-ring.c @@ -1765,18 +1765,19 @@ static u32 cdnsp_td_remainder(struct cdnsp_device *pdev, struct cdnsp_request *preq, bool more_trbs_coming) { - u32 maxp, total_packet_count; - - /* One TRB with a zero-length data packet. */ - if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) || - trb_buff_len == td_total_len) - return 0; + u32 maxp, total_packet_count, remainder; maxp = usb_endpoint_maxp(preq->pep->endpoint.desc); total_packet_count = DIV_ROUND_UP(td_total_len, maxp); /* Queuing functions don't count the current TRB into transferred. */ - return (total_packet_count - ((transferred + trb_buff_len) / maxp)); + remainder = (total_packet_count - ((transferred + trb_buff_len) / maxp)); + + /* Before ZLP driver needs set TD_SIZE=1. */ + if (!remainder && more_trbs_coming) + remainder = 1; + + return remainder; } static int cdnsp_align_td(struct cdnsp_device *pdev,