[Letux-kernel] [PATCH 01/14] i2c: jz4780: suppress txabrt reports for i2cdetect

H. Nikolaus Schaller hns at goldelico.com
Tue Feb 11 22:41:18 CET 2020

This suppresses "simple" error reasons


from flooding the console log when running i2cdetect on
addresses without a responding slave.

Additionally, reading the JZ4780_I2C_TAR in this situation
seems to harm the controller state.

Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
 drivers/i2c/busses/i2c-jz4780.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index 16a67a64284a..55b7518435f1 100644
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -578,6 +578,9 @@ static void jz4780_i2c_txabrt(struct jz4780_i2c *i2c, int src)
 	int i;
+	if (!(src & ~7))
+		return;
 	dev_err(&i2c->adap.dev, "txabrt: 0x%08x\n", src);
 	dev_err(&i2c->adap.dev, "device addr=%x\n",
 		jz4780_i2c_readw(i2c, JZ4780_I2C_TAR));

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