Patch "dmaengine: ti: k3-udma: Do conditional decrement of UDMA_CHAN_RT_PEER_BCNT_REG" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

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

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dmaengine-ti-k3-udma-do-conditional-decrement-of-udm.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2a5f92dd2ce3ed3e5bc88c57c6566d30b934d5e3
Author: Jayesh Choudhary <j-choudhary@xxxxxx>
Date:   Mon Nov 28 14:20:05 2022 +0530

    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@xxxxxx>
    Acked-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20221128085005.489964-1-j-choudhary@xxxxxx
    Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 7b5081989b3d..b86b809eb1f7 100644
--- 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);
 	}
 }