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i2c: tegra-bpmp: Implement better error handling

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Inspect a message's return value upon successful IVC transaction to
determine if the I2C transaction on the BPMP side was successful.

Heavily based on work by Timo Alho <talho@nvidia.com>.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Thierry Reding 2021-03-23 16:57:13 +01:00 committed by Wolfram Sang
parent 71581562ee
commit 1a0e240d09
1 changed files with 26 additions and 1 deletions
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27
drivers/i2c/busses/i2c-tegra-bpmp.c
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@ -217,7 +217,32 @@ static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
else
err = tegra_bpmp_transfer(i2c->bpmp, &msg);
return err;
if (err < 0) {
dev_err(i2c->dev, "failed to transfer message: %d\n", err);
return err;
}
if (msg.rx.ret != 0) {
if (msg.rx.ret == -BPMP_EAGAIN) {
dev_dbg(i2c->dev, "arbitration lost\n");
return -EAGAIN;
}
if (msg.rx.ret == -BPMP_ETIMEDOUT) {
dev_dbg(i2c->dev, "timeout\n");
return -ETIMEDOUT;
}
if (msg.rx.ret == -BPMP_ENXIO) {
dev_dbg(i2c->dev, "NAK\n");
return -ENXIO;
}
dev_err(i2c->dev, "transaction failed: %d\n", msg.rx.ret);
return -EIO;
}
return 0;
}
static int tegra_bpmp_i2c_xfer_common(struct i2c_adapter *adapter,