From 8afbc114542a6810b0a2e658abda6e911121cd22 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 25 Aug 2008 12:01:31 +0300 Subject: [PATCH] [MTD] [NAND] OMAP2: add retry after read timeout Very occasionally, (about one in a million) read operations are ongoing after the timeout has expired. So, retry three times while the ongoing bit remains set. Signed-off-by: Adrian Hunter Signed-off-by: David Woodhouse --- drivers/mtd/onenand/omap2.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c index 34b42533f4bb..8387e05daae2 100644 --- a/drivers/mtd/onenand/omap2.c +++ b/drivers/mtd/onenand/omap2.c @@ -187,16 +187,36 @@ retry: } } } else { + int retry_cnt = 0; + /* Turn interrupts off */ syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); syscfg &= ~ONENAND_SYS_CFG1_IOBE; write_reg(c, syscfg, ONENAND_REG_SYS_CFG1); timeout = jiffies + msecs_to_jiffies(20); - while (time_before(jiffies, timeout)) { - intr = read_reg(c, ONENAND_REG_INTERRUPT); - if (intr & ONENAND_INT_MASTER) + while (1) { + if (time_before(jiffies, timeout)) { + intr = read_reg(c, ONENAND_REG_INTERRUPT); + if (intr & ONENAND_INT_MASTER) + break; + } else { + /* Timeout after 20ms */ + ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); + if (ctrl & ONENAND_CTRL_ONGO) { + /* + * The operation seems to be still going + * so give it some more time. + */ + retry_cnt += 1; + if (retry_cnt < 3) { + timeout = jiffies + + msecs_to_jiffies(20); + continue; + } + } break; + } } }