* [PATCH] mtd: atmel_nand: incease the chip_delay to support some 4k-page flash
@ 2014-07-22 9:12 Josh Wu
0 siblings, 0 replies; only message in thread
From: Josh Wu @ 2014-07-22 9:12 UTC (permalink / raw)
To: linux-mtd; +Cc: Josh Wu, computersforpeace
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@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
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