--- drivers/mtd/nand/pxa3xx_nand.c

+++ drivers/mtd/nand/pxa3xx_nand.c

@@ -316,7 +316,7 @@ static struct pxa3xx_nand_flash *builtin

#define tAR_NDTR1(r) (((r) >> 0) & 0xf)

/* convert nano-seconds to nand flash controller clock cycles */

-#define ns2cycle(ns, clk) (int)(((ns) * (clk / 1000000) / 1000) - 1)

+#define ns2cycle(ns, clk) (int)((ns) * (clk / 1000000) / 1000)

/* convert nand flash controller clock cycles to nano-seconds */

#define cycle2ns(c, clk) ((((c) + 1) * 1000000 + clk / 500) / (clk / 1000))