[PATCH 6.18 1449/1518] net: airoha: npu: fix missing streaming DMA mask

6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Pawlik <redacted>

[ Upstream commit 6fe7e31a45e3418a39e6343a85126124feec1c2f ]

The driver calls dma_set_coherent_mask() but never dma_set_mask(),
leaving the streaming DMA mask at the bus default. On the non-coherent
EN7581 platform (Cortex-A53), this causes the NPU mailbox to hang
after approximately 41 calls when using streaming DMA mappings.

Replace dma_set_coherent_mask() with dma_set_mask_and_coherent() to
set both the streaming and coherent DMA masks, matching standard
driver practice.

Fixes: 6f884eb87a79 ("net: airoha: Fix DMA direction for NPU mailbox buffer")
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260814110017.2795022-1-pawlik.dan@gmail.com/
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260809152813.585797-1-pawlik.dan@gmail.com/
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260805070851.2885888-1-pawlik.dan@gmail.com/
Signed-off-by: Daniel Pawlik <redacted>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260820085941.380401-1-pawlik.dan@gmail.com (local)
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/airoha/airoha_npu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_npu.c b/drivers/net/ethernet/airoha/airoha_npu.c
index d6547834d3c78..ddc5a6a7681b1 100644
--- a/drivers/net/ethernet/airoha/airoha_npu.c
+++ b/drivers/net/ethernet/airoha/airoha_npu.c

@@ -686,7 +686,7 @@ static int airoha_npu_probe(struct platform_device *pdev)
 		npu->irqs[i] = irq;
 	}
 
-	err = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (err)
 		return err;
 

-- 
2.53.0