diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2017-11-15 15:32:21 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2017-11-27 18:53:34 +0100 |
| commit | 4ed152c4daf32d2cd4a5285f3aaca3a4c89a31fb (patch) | |
| tree | 9a7ef07607e77a84ed80bdb4bc631147fb805302 /drivers/i2c/busses/i2c-sh_mobile.c | |
| parent | i2c: sh_mobile: send STOP according to datasheet (diff) | |
| download | linux-4ed152c4daf32d2cd4a5285f3aaca3a4c89a31fb.tar.xz linux-4ed152c4daf32d2cd4a5285f3aaca3a4c89a31fb.zip | |
i2c: sh_mobile: make sure to not accidently trigger STOP
The datasheet was a bit vague, but after consultation with HW designers,
we came to the conclusion that we should set the SCP bit always when
dealing only with the ICE bit. A set SCP bit is ignored, and thus fine,
a cleared one may trigger STOP on the bus.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-sh_mobile.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-sh_mobile.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index c904be631db3..bc1605a31534 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -604,10 +604,10 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, if (do_init) { /* Initialize channel registers */ - iic_wr(pd, ICCR, 0); + iic_wr(pd, ICCR, ICCR_SCP); /* Enable channel and configure rx ack */ - iic_wr(pd, ICCR, ICCR_ICE); + iic_wr(pd, ICCR, ICCR_ICE | ICCR_SCP); /* Set the clock */ iic_wr(pd, ICCL, pd->iccl & 0xff); @@ -723,7 +723,7 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, } /* Disable channel */ - iic_wr(pd, ICCR, 0); + iic_wr(pd, ICCR, ICCR_SCP); /* Disable clock and mark device as idle */ pm_runtime_put_sync(pd->dev); |