From 2f9992e080b8892a10d189cbc846c06e6594ad0b Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Wed, 2 Dec 2015 15:10:40 +0100 Subject: [PATCH] mtd: nand: sunxi: fix clk rate calculation Unlike what is specified in the Allwinner datasheets, the NAND clock rate is not equal to 2/T but 1/T. Fix the clock rate selection accordingly. Signed-off-by: Boris Brezillon --- drivers/mtd/nand/sunxi_nand.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index 546a9ca..05b3303 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1208,12 +1208,12 @@ static int sunxi_nand_chip_set_timings(struct sunxi_nand_chip *chip, min_clk_period = DIV_ROUND_UP(min_clk_period, 1000); /* - * Convert min_clk_period into a clk frequency, then get the - * appropriate rate for the NAND controller IP given this formula - * (specified in the datasheet): - * nand clk_rate = 2 * min_clk_rate + * Unlike what is stated in Allwinner datasheet, the clk_rate should + * be set to (1 / min_clk_period), and not (2 / min_clk_period). + * This new formula was verified with a scope and validated by + * Allwinner engineers. */ - chip->clk_rate = (2 * NSEC_PER_SEC) / min_clk_period; + chip->clk_rate = NSEC_PER_SEC / min_clk_period; return 0; } -- 2.7.4