Commit 21704804 authored Apr 07, 2014 by Joe Schultz Committed by Brian Norris May 20, 2014

mtd: fsl_ifc_nand: Workaround bogus WP on 16-bit NAND



A workaround was already in place that set the WP bit in the
IFC_CSPR0 register after a STATUS command, however it used an 8-bit
write method. As a result, the WP bit was never set on 16-bit devices,
and these devices would eventually be incorrectly marked as
write-protected.

This patch checks the chip options for a 16-bit device and uses the
appropriate write method to set the WP bit after a STATUS command.

Signed-off-by: Joe Schultz <jschultz@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

parent 4454406e

drivers/mtd/nand/fsl_ifc_nand.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -591,6 +591,9 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
		* The chip always seems to report that it is
		* write-protected, even when it is not.
		*/
		if (chip->options & NAND_BUSWIDTH_16)
		setbits16(ifc_nand_ctrl->addr, NAND_STATUS_WP);
		else
		setbits8(ifc_nand_ctrl->addr, NAND_STATUS_WP);
		return;