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>

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)