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From dee3f591103910c8d8b2a6d57879ccd2a4be4b10 Mon Sep 17 00:00:00 2001
Message-ID: <dee3f591103910c8d8b2a6d57879ccd2a4be4b10.1706067287.git.daniel@makrotopia.org>
From: Daniel Golle <daniel@makrotopia.org>
Date: Wed, 24 Jan 2024 03:19:49 +0000
Subject: [PATCH net] net: ethernet: mtk_eth_soc: set coherent mask to get PPE
working
To: Felix Fietkau <nbd@nbd.name>,
Sean Wang <sean.wang@mediatek.com>,
Mark Lee <Mark-MC.Lee@mediatek.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
David S. Miller <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
Daniel Golle <daniel@makrotopia.org>,
netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Set DMA coherent mask to 32-bit which makes PPE offloading engine start
working on BPi-R4 which got 4 GiB of RAM.
Fixes: 2d75891ebc09 ("net: ethernet: mtk_eth_soc: support 36-bit DMA addressing on MT7988")
Suggested-by: Elad Yifee <eladwf@users.github.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -4832,7 +4832,10 @@ static int mtk_probe(struct platform_dev
}
if (MTK_HAS_CAPS(eth->soc->caps, MTK_36BIT_DMA)) {
- err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(36));
+ err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(36));
+ if (!err)
+ err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+
if (err) {
dev_err(&pdev->dev, "Wrong DMA config\n");
return -EINVAL;
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