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Commit d2350c2a authored by Barry Song's avatar Barry Song Committed by David Woodhouse
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mtd: Blackfin NFC: fix nand busy detection 



The IRQSTAT register is a W1C register used by the interrupt handler and
may have its BUSY bit changed.  This makes it somewhat unreliable for the
polling devready function.  So switch it over to use the BUSY bit in the
STAT register that always reflects the current state of the hardware.

This fixes driver hangs seen when the NAND flash is under heavy system
load (like I/O benchmarks).

Signed-off-by: default avatarBarry Song <barry.song@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 44299179

drivers/mtd/nand/bf5xx_nand.c

+2 −2
Original line number Diff line number Diff line
@@ -215,9 +215,9 @@ static void bf5xx_nand_hwcontrol(struct mtd_info *mtd, int cmd, 
 */

static int bf5xx_nand_devready(struct mtd_info *mtd)

{

	unsigned short val = bfin_read_NFC_IRQSTAT();

	unsigned short val = bfin_read_NFC_STAT();



	if ((val & NBUSYIRQ) == NBUSYIRQ)

	if ((val & NBUSY) == NBUSY)

		return 1;

	else

		return 0;