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Subject[PATCH 02/12] i2c: designware-master: use core to detect 'no zero length' quirk
Date
And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

Only build tested.

drivers/i2c/busses/i2c-designware-master.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index fc7c255c80af..a1717bff06a8 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -274,13 +274,6 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
break;
}

- if (msgs[dev->msg_write_idx].len == 0) {
- dev_err(dev->dev,
- "%s: invalid message length\n", __func__);
- dev->msg_err = -EINVAL;
- break;
- }
-
if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
/* new i2c_msg */
buf = msgs[dev->msg_write_idx].buf;
@@ -523,6 +516,10 @@ static const struct i2c_algorithm i2c_dw_algo = {
.functionality = i2c_dw_func,
};

+static const struct i2c_adapter_quirks i2c_dw_quirks = {
+ .flags = I2C_AQ_NO_ZERO_LEN,
+};
+
static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
{
u32 stat;
@@ -718,6 +715,7 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
"Synopsys DesignWare I2C adapter");
adap->retries = 3;
adap->algo = &i2c_dw_algo;
+ adap->quirks = &i2c_dw_quirks;
adap->dev.parent = dev->dev;
i2c_set_adapdata(adap, dev);

--
2.11.0
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