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-rw-r--r--drivers/mtd/nand/omap2.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index fbe84146717..f1648fd5924 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -244,7 +244,8 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
}
/* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x0);
+ ret = gpmc_prefetch_enable(info->gpmc_cs,
+ PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0);
if (ret) {
/* PFPW engine is busy, use cpu copy method */
if (info->nand.options & NAND_BUSWIDTH_16)
@@ -289,7 +290,8 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
}
/* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x1);
+ ret = gpmc_prefetch_enable(info->gpmc_cs,
+ PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1);
if (ret) {
/* PFPW engine is busy, use cpu copy method */
if (info->nand.options & NAND_BUSWIDTH_16)
@@ -345,8 +347,9 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
int ret;
unsigned long tim, limit;
- /* The fifo depth is 64 bytes. We have a sync at each frame and frame
- * length is 64 bytes.
+ /* The fifo depth is 64 bytes max.
+ * But configure the FIFO-threahold to 32 to get a sync at each frame
+ * and frame length is 32 bytes.
*/
int buf_len = len >> 6;
@@ -387,7 +390,8 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
OMAP24XX_DMA_GPMC, OMAP_DMA_SRC_SYNC);
}
/* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs, 0x1, len, is_write);
+ ret = gpmc_prefetch_enable(info->gpmc_cs,
+ PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
if (ret)
/* PFPW engine is busy, use cpu copy method */
goto out_copy;
@@ -522,7 +526,8 @@ static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len)
init_completion(&info->comp);
/* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x0);
+ ret = gpmc_prefetch_enable(info->gpmc_cs,
+ PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0);
if (ret)
/* PFPW engine is busy, use cpu copy method */
goto out_copy;
@@ -569,8 +574,9 @@ static void omap_write_buf_irq_pref(struct mtd_info *mtd,
info->buf = (u_char *) buf;
init_completion(&info->comp);
- /* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x1);
+ /* configure and start prefetch transfer : size=24 */
+ ret = gpmc_prefetch_enable(info->gpmc_cs,
+ (PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1);
if (ret)
/* PFPW engine is busy, use cpu copy method */
goto out_copy;