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Thu, 20 Aug 2026 02:00:01 -0700 (PDT) Received: from fedora ([46.205.218.68]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499aa1111b2sm176837215e9.5.2026.08.20.01.59.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Aug 2026 02:00:00 -0700 (PDT) From: Daniel Pawlik To: netdev@vger.kernel.org Cc: linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kuba@kernel.org, lorenzo@kernel.org, nbd@nbd.name, sean.wang@mediatek.com, Mark-MC.Lee@mediatek.com, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, yangshiji66@outlook.com, Daniel Pawlik Subject: [PATCH v10 1/2] net: airoha: npu: fix missing streaming DMA mask Date: Thu, 20 Aug 2026 10:59:40 +0200 Message-ID: <20260820085941.380401-1-pawlik.dan@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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/ Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Daniel Pawlik --- 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 b679bed952de..4045d1eb93ea 100644 --- a/drivers/net/ethernet/airoha/airoha_npu.c +++ b/drivers/net/ethernet/airoha/airoha_npu.c @@ -766,7 +766,7 @@ 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; -- 2.55.0