MIPS: lantiq: dma: fix burst length for DEU

[ Upstream commit 5ad74d39c51dd41b3c819f4f5396655f0629b4fd ]

The current definition of 2W burst length is invalid.
This patch fixes it. Current downstream DEU driver doesn't
use DMA. An incorrect burst length value doesn't cause any
errors. This patch also adds other burst length values.

Fixes: dfec1a827d2b ("MIPS: Lantiq: Add DMA support")
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
index 364ab39..53fcc67 100644 (file)
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -41,7 +41,11 @@
 #define DMA_IRQ_ACK            0x7e            /* IRQ status register */
 #define DMA_POLL               BIT(31)         /* turn on channel polling */
 #define DMA_CLK_DIV4           BIT(6)          /* polling clock divider */
-#define DMA_2W_BURST           BIT(1)          /* 2 word burst length */
+#define DMA_PCTRL_2W_BURST     0x1             /* 2 word burst length */
+#define DMA_PCTRL_4W_BURST     0x2             /* 4 word burst length */
+#define DMA_PCTRL_8W_BURST     0x3             /* 8 word burst length */
+#define DMA_TX_BURST_SHIFT     4               /* tx burst shift */
+#define DMA_RX_BURST_SHIFT     2               /* rx burst shift */
 #define DMA_ETOP_ENDIANNESS    (0xf << 8) /* endianness swap etop channels */
 #define DMA_WEIGHT     (BIT(17) | BIT(16))     /* default channel wheight */
 
@@ -192,7 +196,8 @@ ltq_dma_init_port(int p)
                break;
 
        case DMA_PORT_DEU:
-               ltq_dma_w32((DMA_2W_BURST << 4) | (DMA_2W_BURST << 2),
+               ltq_dma_w32((DMA_PCTRL_2W_BURST << DMA_TX_BURST_SHIFT) |
+                       (DMA_PCTRL_2W_BURST << DMA_RX_BURST_SHIFT),
                        LTQ_DMA_PCTRL);
                break;