diff options
| author | Kyungmin Park <kyungmin.park@samsung.com> | 2010-09-27 16:25:17 +0900 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-10-25 00:50:09 +0100 |
| commit | ebe8a642f50a0020bed317afcde1f9d2a9da429b (patch) | |
| tree | 0bfc44174459b60ae434f35157b597fe3eced428 /drivers/mtd/onenand/samsung.c | |
| parent | 12a40a57f762f569f58a393437d8c13864db390a (diff) | |
| download | linux-ebe8a642f50a0020bed317afcde1f9d2a9da429b.tar.bz2 | |
mtd: OneNAND: S5PC110: Add timeout to prevent the endless loop
There's no case timeout but add it for some H/W problem or
wrong codes implementation
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/onenand/samsung.c')
| -rw-r--r-- | drivers/mtd/onenand/samsung.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c index 7913a921b08b..b80128036a28 100644 --- a/drivers/mtd/onenand/samsung.c +++ b/drivers/mtd/onenand/samsung.c @@ -535,6 +535,7 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction) { void __iomem *base = onenand->dma_addr; int status; + unsigned long timeout; writel(src, base + S5PC110_DMA_SRC_ADDR); writel(dst, base + S5PC110_DMA_DST_ADDR); @@ -552,6 +553,13 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction) writel(S5PC110_DMA_TRANS_CMD_TR, base + S5PC110_DMA_TRANS_CMD); + /* + * There's no exact timeout values at Spec. + * In real case it takes under 1 msec. + * So 20 msecs are enough. + */ + timeout = jiffies + msecs_to_jiffies(20); + do { status = readl(base + S5PC110_DMA_TRANS_STATUS); if (status & S5PC110_DMA_TRANS_STATUS_TE) { @@ -559,7 +567,8 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction) base + S5PC110_DMA_TRANS_CMD); return -EIO; } - } while (!(status & S5PC110_DMA_TRANS_STATUS_TD)); + } while (!(status & S5PC110_DMA_TRANS_STATUS_TD) && + time_before(jiffies, timeout)); writel(S5PC110_DMA_TRANS_CMD_TDC, base + S5PC110_DMA_TRANS_CMD); |