dmaengine: ti: k3-udma: Do conditional decrement of UDMA_CHAN_RT_PEER_BCNT_REG

[ Upstream commit efab25894a41a920d9581183741e7fadba00719c ]

PSIL_EP_NATIVE endpoints may not have PEER registers for BCNT and thus
udma_decrement_byte_counters() should not try to decrement these counters.
This fixes the issue of crypto IPERF testing where the client side (EVM)
hangs without transfer of packets to the server side, seen since this
function was added.

Fixes: 7c94dcfa8fcf ("dmaengine: ti: k3-udma: Reset UDMA_CHAN_RT byte counters to prevent overflow")
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20221128085005.489964-1-j-choudhary@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 7b50819..b86b809 100644 (file)
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -761,11 +761,12 @@ static void udma_decrement_byte_counters(struct udma_chan *uc, u32 val)
        if (uc->desc->dir == DMA_DEV_TO_MEM) {
                udma_rchanrt_write(uc, UDMA_CHAN_RT_BCNT_REG, val);
                udma_rchanrt_write(uc, UDMA_CHAN_RT_SBCNT_REG, val);
-               udma_rchanrt_write(uc, UDMA_CHAN_RT_PEER_BCNT_REG, val);
+               if (uc->config.ep_type != PSIL_EP_NATIVE)
+                       udma_rchanrt_write(uc, UDMA_CHAN_RT_PEER_BCNT_REG, val);
        } else {
                udma_tchanrt_write(uc, UDMA_CHAN_RT_BCNT_REG, val);
                udma_tchanrt_write(uc, UDMA_CHAN_RT_SBCNT_REG, val);
-               if (!uc->bchan)
+               if (!uc->bchan && uc->config.ep_type != PSIL_EP_NATIVE)
                        udma_tchanrt_write(uc, UDMA_CHAN_RT_PEER_BCNT_REG, val);
        }
 }