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| author | Dongil Park <dongil01.park@samsung.com> | 2016-05-26 10:04:27 +0900 |
|---|---|---|
| committer | wansu.yoo <wansu.yoo@samsung.com> | 2016-08-24 10:15:13 +0900 |
| commit | 96574aaadfab9acc5a7d354c384fbf24061eb851 (patch) | |
| tree | 33285515b596931e6c1a1a2bf0151cdeac905395 /drivers | |
| parent | 85fbbdc6c2de88d67b91b41c9ee1963a6e7cc19f (diff) | |
| download | linux-3.10-artik-96574aaadfab9acc5a7d354c384fbf24061eb851.tar.gz linux-3.10-artik-96574aaadfab9acc5a7d354c384fbf24061eb851.tar.bz2 linux-3.10-artik-96574aaadfab9acc5a7d354c384fbf24061eb851.zip | |
i2c: s3c24xx: Add clear pending bit for i2c stop.
This patch adds clear pending bit for i2c stop to avoid interrupt flooding
while i2c stop.
Change-Id: I424207bf2ccc905e4c266d632478e66e02f5d12c
Signed-off-by: Dongil Park <dongil01.park@samsung.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-s3c2410.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index b58d73bf8fb..c47104be2c0 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -323,6 +323,7 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) { unsigned long iicstat = readl(i2c->regs + S3C2410_IICSTAT); + unsigned long iiccon = 0; dev_dbg(i2c->dev, "STOP\n"); @@ -369,10 +370,16 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) } writel(iicstat, i2c->regs + S3C2410_IICSTAT); - i2c->state = STATE_STOP; + /* Clear pending bit */ + iiccon = readl(i2c->regs + S3C2410_IICCON); + iiccon &= ~S3C2410_IICCON_IRQPEND; + writel(iiccon, i2c->regs + S3C2410_IICCON); - s3c24xx_i2c_master_complete(i2c, ret); s3c24xx_i2c_disable_irq(i2c); + + s3c24xx_i2c_master_complete(i2c, ret); + + i2c->state = STATE_STOP; } /* helper functions to determine the current state in the set of |