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authorWu, Josh <Josh.wu@atmel.com>2014-06-10 13:50:10 +0400
committerBrian Norris <computersforpeace@gmail.com>2014-07-22 07:02:09 +0400
commit72a78e3cd2c02c46ce5a3b89a2a854199e5a4820 (patch)
tree8ce6da298b10841ae5827ac428cb6cf2caf8e307 /drivers/mtd
parent50e04e2f0cf25917d8bec05326d0003cc2ab25eb (diff)
downloadlinux-72a78e3cd2c02c46ce5a3b89a2a854199e5a4820.tar.xz
mtd: atmel_nand: implement the nfc_device_ready() by checking the R/B bit
In nfc_device_ready(), it's more reasonable to check R/B bit in NFC_SR than waiting for the R/B interrupt. It cost less time. Signed-off-by: Josh Wu <josh.wu@atmel.com> Tested-by: Matthieu Crapet <Matthieu.Crapet@ingenico.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/atmel_nand.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 22e9137412b4..459acf01fefe 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -1661,11 +1661,19 @@ static int nfc_send_command(struct atmel_nand_host *host,
static int nfc_device_ready(struct mtd_info *mtd)
{
+ u32 status, mask;
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
- if (!nfc_wait_interrupt(host, NFC_SR_RB_EDGE))
- return 1;
- return 0;
+
+ status = nfc_read_status(host);
+ mask = nfc_readl(host->nfc->hsmc_regs, IMR);
+
+ /* The mask should be 0. If not we may lost interrupts */
+ if (unlikely(mask & status))
+ dev_err(host->dev, "Lost the interrupt flags: 0x%08x\n",
+ mask & status);
+
+ return status & NFC_SR_RB_EDGE;
}
static void nfc_select_chip(struct mtd_info *mtd, int chip)