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Commit ef89a880 authored by Karl Beldan's avatar Karl Beldan Committed by David Woodhouse
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[MTD] [NAND] nand_base.c: reset chip first 



Some chips require a RESET after power-up (e.g. Micron MT29FxGxxxxx).
The first command sent is NAND_CMD_READID.
Issue a NAND_CMD_RESET in nand_scan_ident before reading the device id.
Tested with an MT29F4G08AAC.

Signed-off-by: default avatarKarl Beldan <karl.beldan@gmail.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 8afbc114

drivers/mtd/nand/nand_base.c

+8 −0
Original line number Diff line number Diff line
@@ -2318,6 +2318,12 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd, 
	/* Select the device */

	chip->select_chip(mtd, 0);



	/*

	 * Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)

	 * after power-up

	 */

	chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);



	/* Send the command for reading device ID */

	chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
@@ -2488,6 +2494,8 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips) 
	/* Check for a chip array */

	for (i = 1; i < maxchips; i++) {

		chip->select_chip(mtd, i);

		/* See comment in nand_get_flash_type for reset */

		chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);

		/* Send the command for reading device ID */

		chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);

		/* Read manufacturer and device IDs */