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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2008-08-14 14:00:12 +0300
committerDavid Woodhouse <David.Woodhouse@intel.com>2008-08-15 01:25:30 +0100
commit782b7a367d81da005d93b28cb00f9ae086773c24 (patch)
tree79d42e09cb7c891f98131798bfee8e7959ea97ad
parentbde86fec7c822b6009d3cfefc20b76b8d34716af (diff)
[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>
-rw-r--r--drivers/mtd/onenand/omap2.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c
index 40153ace5df6..34b42533f4bb 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) {