From 782b7a367d81da005d93b28cb00f9ae086773c24 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 14 Aug 2008 14:00:12 +0300 Subject: [MTD] [OneNAND] OMAP3: add delay for GPIO On OMAP3, the driver was occasionally not seeing the GPIO interrupt. Adding a small delay of one register read eliminates the problem. Signed-off-by: Adrian Hunter Signed-off-by: David Woodhouse --- drivers/mtd/onenand/omap2.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/mtd/onenand/omap2.c') diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c index 40153ac..34b4253 100644 --- a/drivers/mtd/onenand/omap2.c +++ b/drivers/mtd/onenand/omap2.c @@ -141,8 +141,13 @@ static int omap2_onenand_wait(struct mtd_info *mtd, int state) /* Turn interrupts on */ syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); - syscfg |= ONENAND_SYS_CFG1_IOBE; - write_reg(c, syscfg, ONENAND_REG_SYS_CFG1); + if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) { + syscfg |= ONENAND_SYS_CFG1_IOBE; + write_reg(c, syscfg, ONENAND_REG_SYS_CFG1); + if (cpu_is_omap34xx()) + /* Add a delay to let GPIO settle */ + syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); + } INIT_COMPLETION(c->irq_done); if (c->gpio_irq) { -- cgit v1.1