From: Forrest Shi <[email protected]>
Fixed fsl dma slow issue by initializing dma mode register with
bandwidth control. It boosts dma performance and should works
with 85xx board.
Signed-off-by: Forrest Shi <[email protected]>
Signed-off-by: Li Yang <[email protected]>
---
drivers/dma/fsldma.c | 6 ++++--
drivers/dma/fsldma.h | 9 ++++++++-
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 286c3ac..e5e172d 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -50,9 +50,11 @@ static void dma_init(struct fsldma_chan *chan)
* EIE - Error interrupt enable
* EOSIE - End of segments interrupt enable (basic mode)
* EOLNIE - End of links interrupt enable
+ * BWC - Bandwidth sharing among channels
*/
- DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_EIE
- | FSL_DMA_MR_EOLNIE | FSL_DMA_MR_EOSIE, 32);
+ DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_BWC
+ | FSL_DMA_MR_EIE | FSL_DMA_MR_EOLNIE
+ | FSL_DMA_MR_EOSIE, 32);
break;
case FSL_DMA_IP_83XX:
/* Set the channel to below modes:
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index cb4d6ff..ba9f403 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved.
*
* Author:
* Zhang Wei <[email protected]>, Jul 2007
@@ -36,6 +36,13 @@
#define FSL_DMA_MR_DAHE 0x00002000
#define FSL_DMA_MR_SAHE 0x00001000
+/*
+ * Bandwidth/pause control determines how many bytes a given
+ * channel is allowed to transfer before the DMA engine pauses
+ * the current channel and switches to the next channel
+ */
+#define FSL_DMA_MR_BWC 0x08000000
+
/* Special MR definition for MPC8349 */
#define FSL_DMA_MR_EOTIE 0x00000080
#define FSL_DMA_MR_PRC_RM 0x00000800
--
1.6.6-rc1.GIT
On Thu, Dec 9, 2010 at 12:14 AM, Li Yang <[email protected]> wrote:
> From: Forrest Shi <[email protected]>
>
> Fixed fsl dma slow issue by initializing dma mode register with
> bandwidth control. It boosts dma performance and should works
> with 85xx board.
>
> Signed-off-by: Forrest Shi <[email protected]>
> Signed-off-by: Li Yang <[email protected]>
Applied.