diff options
| author | Federico Vaga <federico.vaga@cern.ch> | 2019-02-14 09:51:31 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2019-02-14 17:55:30 +0100 |
| commit | 2dc9834688ae3ba057d46e60525a11ec146ae3df (patch) | |
| tree | 71578e34cb22aa59ce1da25fb91d01fd9b9814af /drivers/i2c | |
| parent | e7663ef5ae0f02e3b902eb0305dec981333eb3e1 (diff) | |
i2c: ocores: do not handle IRQ if IF is not set
If the Interrupt Flag (IF) is not set, we should not handle the IRQ:
- the line can be shared with other devices
- it can be a spurious interrupt
To avoid reading twice the status register, the ocores_process() function
expects it to be read by the caller.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ocores.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index aa852028d8c1..fcc25582c648 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -143,10 +143,9 @@ static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) return i2c->getreg(i2c, reg); } -static void ocores_process(struct ocores_i2c *i2c) +static void ocores_process(struct ocores_i2c *i2c, u8 stat) { struct i2c_msg *msg = i2c->msg; - u8 stat = oc_getreg(i2c, OCI2C_STATUS); unsigned long flags; /* @@ -223,8 +222,12 @@ out: static irqreturn_t ocores_isr(int irq, void *dev_id) { struct ocores_i2c *i2c = dev_id; + u8 stat = oc_getreg(i2c, OCI2C_STATUS); + + if (!(stat & OCI2C_STAT_IF)) + return IRQ_NONE; - ocores_process(i2c); + ocores_process(i2c, stat); return IRQ_HANDLED; } |