[PATCH V5 20/30] csky/dma: bugfix dma_sync_for_cpu/device

From: Guo Ren <ren_guo@c-sky.com>
To: akpm@linux-foundation.org, arnd@arndb.de,
	daniel.lezcano@linaro.org, davem@davemloft.net,
	gregkh@linuxfoundation.org, jason@lakedaemon.net,
	marc.zyngier@arm.com, mark.rutland@arm.com,
	mchehab+samsung@kernel.org, peterz@infradead.org,
	robh@kernel.org, robh+dt@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	devicetree@vger.kernel.org, green.hu@gmail.com,
	palmer@sifive.com, Guo Ren <ren_guo@c-sky.com>
Subject: [PATCH V5 20/30] csky/dma: bugfix dma_sync_for_cpu/device
Date: Tue, 25 Sep 2018 07:39:23 +0800	[thread overview]
Message-ID: <1ccf1bed89758a5a9b57ac2ce6d11ca898a1b9ae.1537789737.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <a23b652c2ab55b129f729a57ec765550da1d2c16.1537789737.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1537789736.git.ren_guo@c-sky.com>

ref: https://lkml.org/lkml/2018/5/18/1068

        map             for_cpu         for_device      unmap
TO_DEV  writeback       none            writeback       none
TO_CPU  invalidate      invalidate*     invalidate      invalidate*
BIDIR   writeback       invalidate      writeback       invalidate

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 arch/csky/mm/dma-mapping.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c
index 16c2087..30a2041 100644
--- a/arch/csky/mm/dma-mapping.c
+++ b/arch/csky/mm/dma-mapping.c
@@ -217,7 +217,8 @@ void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
 		break;
 	case DMA_FROM_DEVICE:
 	case DMA_BIDIRECTIONAL:
-		BUG();
+		dma_wbinv_range(vaddr + offset, vaddr + offset + size);
+		break;
 	default:
 		BUG();
 	}
@@ -240,7 +241,7 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
 
 	switch (dir) {
 	case DMA_TO_DEVICE:
-		BUG();
+		break;
 	case DMA_FROM_DEVICE:
 	case DMA_BIDIRECTIONAL:
 		dma_wbinv_range(vaddr + offset, vaddr + offset + size);
-- 
2.7.4

