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| author | Wolfram Sang | 2018-04-28 22:01:02 +0200 |
|---|---|---|
| committer | Wolfram Sang | 2018-04-30 11:14:35 +0200 |
| commit | b1437dcb973de79d1f9bca55c6056e8b40ff7ba7 (patch) | |
| tree | 561fb170f41c4b1610e63ca7f4e7977bfa56510b /drivers/i2c/busses/i2c-rcar.c | |
| parent | i2c: mlxcpld: Add capability register description to documentation (diff) | |
| download | kernel-qcow2-linux-b1437dcb973de79d1f9bca55c6056e8b40ff7ba7.tar.gz kernel-qcow2-linux-b1437dcb973de79d1f9bca55c6056e8b40ff7ba7.tar.xz kernel-qcow2-linux-b1437dcb973de79d1f9bca55c6056e8b40ff7ba7.zip | |
i2c: rcar: enhance comment to avoid regressions
Give a clear testcase for people wishing to change this code. It is also
a reminder for me if people ask about it.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-rcar.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index c6915b835396..9d8d5b91220f 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -542,6 +542,8 @@ static void rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) * If next received data is the _LAST_, go to STOP phase. Might be * overwritten by REP START when setting up a new msg. Not elegant * but the only stable sequence for REP START I have found so far. + * If you want to change this code, make sure sending one transfer with + * four messages (WR-RD-WR-RD) works! */ if (priv->pos + 1 >= msg->len) rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); |