[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 <ext-adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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 @@
/* 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) {