[PATCH] dma: ti: k3-udma: Fix channel hang on teardown

Vignesh Raghavendra vigneshr at ti.com
Wed Mar 8 05:12:57 CET 2023

Setting RX flow error handling will stall the channel until descriptors
are available to move RX data. Setting this bit causes issues when
tearing down ethernet DMA channel at the end of TFTP transfer as
unrelated network packets can cause teardown to stall indefinitely waiting
for driver to queue add more desc leading to channel hang with error
udma_stop_dev2mem TIMEOUT !
udma_stop_dev2mem: peer not stopped TIMEOUT !
udma_stop_dev2mem TIMEOUT !

Fix this by clearing rx_error_handling similar to how its done for UDMA
as part of udma_alloc_rchan_sci_req()

This fixes occasional TFTP Failures seen when downloading multiple files
one after the other on AM64/AM62 SoCs.

Fixes: 9a92851c33e8 ("dma: ti: k3-udma: Add BCDMA and PKTDMA support")
Reported-by: Nishanth Menon <nm at ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
 drivers/dma/ti/k3-udma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index d92b96443694..05c3a4311ced 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -2150,7 +2150,7 @@ static int pktdma_tisci_rx_channel_config(struct udma_chan *uc)
 		flow_req.rx_psinfo_present = 1;
 		flow_req.rx_psinfo_present = 0;
-	flow_req.rx_error_handling = 1;
+	flow_req.rx_error_handling = 0;
 	ret = tisci_ops->rx_flow_cfg(tisci_rm->tisci, &flow_req);

More information about the U-Boot mailing list