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UPSTREAM: spl: nand: sunxi: ensure enough time has passed after changing the column 

When changing the column, the ONFI specification states that a minimum
time of tCCS (Change Column Setup time) must elapse between the last
address cycle is asserted on the bus and the first data cycle is
clocked. An usual value for average NANDs is 500 nanoseconds. Round it
up to 1 microsecond to be safe.

Change-Id: If9f02bf0861da520e9c7e6288e41986cbb8fbe0e
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 4dac80a5e991dd3b5b99910d7927edfdf4c99bb3)
This commit is contained in:
Miquel Raynal 2018-02-28 20:51:51 +01:00 committed by Kever Yang
parent 0cb95e3088
commit 989f52df7b
1 changed files with 12 additions and 3 deletions
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15
drivers/mtd/nand/sunxi_nand_spl.c
View File

@ -243,15 +243,24 @@ static int nand_load_page(const struct nfc_config *conf, u32 offs)
static int nand_reset_column(void)
{
int ret;
writel((NFC_CMD_RNDOUTSTART << NFC_RANDOM_READ_CMD1_OFFSET) |
(NFC_CMD_RNDOUT << NFC_RANDOM_READ_CMD0_OFFSET) |
(NFC_CMD_RNDOUTSTART << NFC_READ_CMD_OFFSET),
SUNXI_NFC_BASE + NFC_RCMD_SET);
writel(0, SUNXI_NFC_BASE + NFC_ADDR_LOW);
return nand_exec_cmd(NFC_SEND_CMD1 | NFC_SEND_CMD2 | NFC_RAW_CMD |
(1 << NFC_ADDR_NUM_OFFSET) | NFC_SEND_ADDR |
NFC_CMD_RNDOUT);
ret = nand_exec_cmd(NFC_SEND_CMD1 | NFC_SEND_CMD2 | NFC_RAW_CMD |
(1 << NFC_ADDR_NUM_OFFSET) | NFC_SEND_ADDR |
NFC_CMD_RNDOUT);
if (ret)
return ret;
/* Ensure tCCS has passed before reading data */
udelay(1);
return 0;
}
static int nand_read_page(const struct nfc_config *conf, u32 offs,