target/linux/lantiq/patches-3.9/0002-MIPS-lantiq-adds-4dword-burst-length-for-dma.patch

   1 From e9e520f4f10fdd673e5083bdc082515425ed7457 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 6 Dec 2012 11:59:23 +0100
   4 Subject: [PATCH 02/22] MIPS: lantiq: adds 4dword burst length for dma
   5
   6 ---
   7  arch/mips/lantiq/xway/dma.c |    4 +++-
   8  1 file changed, 3 insertions(+), 1 deletion(-)
   9
  10 diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
  11 index 08f7ebd..ccf1451 100644
  12 --- a/arch/mips/lantiq/xway/dma.c
  13 +++ b/arch/mips/lantiq/xway/dma.c
  14 @@ -48,6 +48,7 @@
  15  #define DMA_IRQ_ACK            0x7e            /* IRQ status register */
  16  #define DMA_POLL               BIT(31)         /* turn on channel polling */
  17  #define DMA_CLK_DIV4           BIT(6)          /* polling clock divider */
  18 +#define DMA_4W_BURST           BIT(2)          /* 4 word burst length */
  19  #define DMA_2W_BURST           BIT(1)          /* 2 word burst length */
  20  #define DMA_MAX_CHANNEL                20              /* the soc has 20 channels */
  21  #define DMA_ETOP_ENDIANNESS    (0xf << 8) /* endianness swap etop channels */
  22 @@ -196,7 +197,8 @@ ltq_dma_init_port(int p)
  23                  * Tell the DMA engine to swap the endianness of data frames and
  24                  * drop packets if the channel arbitration fails.
  25                  */
  26 -               ltq_dma_w32_mask(0, DMA_ETOP_ENDIANNESS | DMA_PDEN,
  27 +               ltq_dma_w32_mask(0, (DMA_4W_BURST << 4) | (DMA_4W_BURST << 2) |
  28 +                       DMA_ETOP_ENDIANNESS | DMA_PDEN,
  29                         LTQ_DMA_PCTRL);
  30                 break;
  31
  32 --
  33 1.7.10.4
  34