Support for enforced STOPs will allow us to use SCCB compatible devices.
Based on a preliminary patch by Wolfram Sang.
Signed-off-by: Jean Delvare <jdelvare@xxxxxxx>
Tested-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
Changes since v1:
* Simplify logic
drivers/i2c/algos/i2c-algo-bit.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- linux-4.11.orig/drivers/i2c/algos/i2c-algo-bit.c 2017-06-19 09:57:17.949074198 +0200
+++ linux-4.11/drivers/i2c/algos/i2c-algo-bit.c 2017-06-21 09:07:07.910049960 +0200
@@ -553,9 +553,18 @@ static int bit_xfer(struct i2c_adapter *
nak_ok = pmsg->flags & I2C_M_IGNORE_NAK;
if (!(pmsg->flags & I2C_M_NOSTART)) {
if (i) {
- bit_dbg(3, &i2c_adap->dev, "emitting "
- "repeated start condition\n");
- i2c_repstart(adap);
+ if (msgs[i - 1].flags & I2C_M_STOP) {
+ bit_dbg(3, &i2c_adap->dev,
+ "emitting enforced stop condition\n");
+ i2c_stop(adap);
+ bit_dbg(3, &i2c_adap->dev,
+ "emitting start condition\n");
+ i2c_start(adap);
+ } else {
+ bit_dbg(3, &i2c_adap->dev,
+ "emitting repeated start condition\n");
+ i2c_repstart(adap);
+ }
}
ret = bit_doAddress(i2c_adap, pmsg);
if ((ret != 0) && !nak_ok) {
--
Jean Delvare
SUSE L3 Support
