From f3c677b997757326e1f29d33060719a6a5091950 Mon Sep 17 00:00:00 2001 From: Forrest Shi Date: Thu, 9 Dec 2010 16:14:04 +0800 Subject: [PATCH] fsldma: fix issue of slow dma 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 Signed-off-by: Li Yang Signed-off-by: Dan Williams --- 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 286c3ac6bdcc..e5e172d21692 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 cb4d6ff51597..ba9f403c0fbe 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 , 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 -- 2.20.1