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mtd: atmel_nand: implement the nfc_device_ready() by checking the R/B bit

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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>
This commit is contained in:
Wu, Josh 2014-06-10 17:50:10 +08:00 committed by Brian Norris
parent 50e04e2f0c
commit 72a78e3cd2
1 changed files with 11 additions and 3 deletions
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14
drivers/mtd/nand/atmel_nand.c
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@ -1661,11 +1661,19 @@ static int nfc_send_command(struct atmel_nand_host *host,
static int nfc_device_ready(struct mtd_info *mtd) static int nfc_device_ready(struct mtd_info *mtd)
{ {
u32 status, mask;
struct nand_chip *nand_chip = mtd->priv; struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv; struct atmel_nand_host *host = nand_chip->priv;
if (!nfc_wait_interrupt(host, NFC_SR_RB_EDGE))
return 1; status = nfc_read_status(host);
return 0; 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) static void nfc_select_chip(struct mtd_info *mtd, int chip)