[PATCH] mtd: atmel_nand: incease the chip_delay to support some 4k-page flash

[Josh Wu]

For MT29F8G08ABABA nand flash, the time read a page (tR) is 25us.
To support it, we need increase the chip_delay to 25us.

Signed-off-by: Josh Wu <josh.wu at atmel.com>
---
 drivers/mtd/nand/atmel_nand.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index e321c56..371afdd 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -2099,7 +2099,11 @@ static int atmel_nand_probe(struct platform_device *pdev)
 	}
 
 	nand_chip->ecc.mode = host->board.ecc_mode;
-	nand_chip->chip_delay = 20;		/* 20us command delay time */
+
+	/* For support 4k-page flash, incease the delay time to 25us.
+	 * In P.108 of MT29F8G08ABABA datasheet, tR max is 25us.
+	 */
+	nand_chip->chip_delay = 25;
 
 	if (host->board.bus_width_16)	/* 16-bit bus width */
 		nand_chip->options |= NAND_BUSWIDTH_16;
-- 
1.9.1