From 7ce380fe7574e7f084e2dc6b24264341fa90ac8e Mon Sep 17 00:00:00 2001 From: Jayesh Choudhary Date: Mon, 28 Nov 2022 14:20:05 +0530 Subject: [PATCH] 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 Acked-by: Peter Ujfalusi Link: https://lore.kernel.org/r/20221128085005.489964-1-j-choudhary@ti.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/ti/k3-udma.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c index 75f2a00..d796e50 100644 --- a/drivers/dma/ti/k3-udma.c +++ b/drivers/dma/ti/k3-udma.c @@ -760,11 +760,12 @@ 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); } } -- 2.7.4