From: Sonic Zhang <sonic.zhang@analog.com>
Date: Tue, 11 Dec 2012 08:51:23 +0000 (+0800)
Subject: blackfin: limit the max memory dma peripheral transfer size to 4 bytes.
X-Git-Tag: v2013.07-rc1~1^2~53^2~20
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=c4239b5341b6eb8126072c853d1eb32e86face7f;p=u-boot

blackfin: limit the max memory dma peripheral transfer size to 4 bytes.

Othersize, the bf609 memory dma halts after being enabled.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
---

diff --git a/arch/blackfin/lib/string.c b/arch/blackfin/lib/string.c
index 44d8c6d906..5b7ac0b91a 100644
--- a/arch/blackfin/lib/string.c
+++ b/arch/blackfin/lib/string.c
@@ -128,10 +128,12 @@ static void dma_calc_size(unsigned long ldst, unsigned long lsrc, size_t count,
 	unsigned long limit;
 
 #ifdef MSIZE
-	limit = 6;
+	/* The max memory DMA memory transfer size is 32 bytes. */
+	limit = 5;
 	*dshift = MSIZE_P;
 #else
-	limit = 3;
+	/* The max memory DMA memory transfer size is 4 bytes. */
+	limit = 2;
 	*dshift = WDSIZE_P;
 #endif
 
@@ -170,7 +172,8 @@ void dma_memcpy_nocache(void *dst, const void *src, size_t count)
 	mod = 1 << bpos;
 
 #ifdef PSIZE
-	dsize |= min(3, bpos) << PSIZE_P;
+	/* The max memory DMA peripheral transfer size is 4 bytes. */
+	dsize |= min(2, bpos) << PSIZE_P;
 #endif
 
 	/* Copy sram functions from sdram to sram */