linux-kernel - [PATCH v2 1/5] of: address: Fix default coherency for MIPS

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Date:   Thu, 23 Feb 2023 11:36:40 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        tsbogend@...ha.franken.de, mpe@...erman.id.au,
        paul.walmsley@...ive.com, palmer@...belt.com, robh+dt@...nel.org,
        hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
        linux-riscv@...ts.infradead.org,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v2 1/5] of: address: Fix default coherency for MIPS

DT-based MIPS doesn't use OF_DMA_DEFAULT_COHERENT, but
might override the system-wide default at runtime.

Use dma_default_coherent to override default coherence for
MIPS.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 drivers/of/address.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 4c0b169ef9bf..c105d66a1fa4 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1105,6 +1105,14 @@ bool of_dma_is_coherent(struct device_node *np)
 	struct device_node *node;
 	bool is_coherent = IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT);
 
+	/*
+	 * DT-based MIPS doesn't use OF_DMA_DEFAULT_COHERENT, but
+	 * might override the system-wide default at runtime.
+	 */
+#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
+	is_coherent = dma_default_coherent;
+#endif
+
 	node = of_node_get(np);
 
 	while (node) {
-- 
2.37.1 (Apple Git-137.1)