unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

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

Browse source 
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: 7c94dcfa8f ("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>
This commit is contained in:
Jayesh Choudhary 2022-11-28 14:20:05 +05:30 committed by Vinod Koul
parent 6744a030d8
commit efab25894a
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/dma/ti/k3-udma.c
View file

@ -762,11 +762,12 @@ 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);
}
}