Feedback-ID: ifd894703:Fastmail
From:   Jiaxun Yang <jiaxun.yang@flygoat.com>
To:     linux-mips@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        tsbogend@alpha.franken.de, mpe@ellerman.id.au,
        paul.walmsley@sifive.com, palmer@dabbelt.com, robh+dt@kernel.org,
        hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com,
        Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: [PATCH 3/7] MIPS: c-r4k: Always install dma flush functions
Date:   Tue, 21 Feb 2023 12:46:09 +0000
Message-Id: <20230221124613.2859-4-jiaxun.yang@flygoat.com>
In-Reply-To: <20230221124613.2859-1-jiaxun.yang@flygoat.com>
References: <20230221124613.2859-1-jiaxun.yang@flygoat.com>
MIME-Version: 1.0
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As nowadays DMA coherence is managed per device, it is possible
to have a system that is defaulted to coherent dma but still
have noncoherent device that needs to use those flush functions.

Just install them unconditionally.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 arch/mips/mm/c-r4k.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index a549fa98c2f4..7d447050a20b 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -1867,15 +1867,9 @@ void r4k_cache_init(void)
 	__local_flush_icache_user_range	= local_r4k_flush_icache_user_range;
 
 #ifdef CONFIG_DMA_NONCOHERENT
-	if (dma_default_coherent) {
-		_dma_cache_wback_inv	= (void *)cache_noop;
-		_dma_cache_wback	= (void *)cache_noop;
-		_dma_cache_inv		= (void *)cache_noop;
-	} else {
-		_dma_cache_wback_inv	= r4k_dma_cache_wback_inv;
-		_dma_cache_wback	= r4k_dma_cache_wback_inv;
-		_dma_cache_inv		= r4k_dma_cache_inv;
-	}
+	_dma_cache_wback_inv	= r4k_dma_cache_wback_inv;
+	_dma_cache_wback	= r4k_dma_cache_wback_inv;
+	_dma_cache_inv		= r4k_dma_cache_inv;
 #endif /* CONFIG_DMA_NONCOHERENT */
 
 	build_clear_page();
-- 
2.37.1 (Apple Git-137.1)