From 499b9194ad7b7b6d7c06b01005508e5bcf3c8980 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Amaury=20Decr=C3=AAme?= Date: Mon, 28 Jan 2013 22:21:07 +0100 Subject: [PATCH] i2c: sis630: fix behavior after collision MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Datasheet on collision: SMBus Collision (SMBCOL_STS) This bit is set when a SMBus Collision condition occurs and SMBus Host loses in the bus arbitration. The software should clear this bit and re-start SMBus operation. As the status will be cleared in transaction_end, we can remove the sis630_write and prepare to return -EAGAIN to retry. Signed-off-by: Amaury Decrême Reviewed-by: Jean Delvare Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-sis630.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c index 3124d80..e152d36 100644 --- a/drivers/i2c/busses/i2c-sis630.c +++ b/drivers/i2c/busses/i2c-sis630.c @@ -200,12 +200,7 @@ static int sis630_transaction_wait(struct i2c_adapter *adap, int size) if (temp & 0x04) { dev_err(&adap->dev, "Bus collision!\n"); - result = -EIO; - /* - TBD: Datasheet say: - the software should clear this bit and restart SMBUS operation. - Should we do it or user start request again? - */ + result = -EAGAIN; } return result; -- 2.7.4