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| author | Frank Li <Frank.Li@nxp.com> | 2024-05-06 18:40:07 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2024-05-23 00:29:19 +0200 |
| commit | 0d25965082013a3743972ca1887380b66de47dd3 (patch) | |
| tree | b753ccb22d4ba52aa452162a5713f8d95f667ed0 /drivers | |
| parent | Linux 6.9-rc1 (diff) | |
| download | linux-0d25965082013a3743972ca1887380b66de47dd3.tar.xz linux-0d25965082013a3743972ca1887380b66de47dd3.zip | |
i3c: Add comment for -EAGAIN in i3c_device_do_priv_xfers()
In accordance with I3C spec ver 1.1.1 09-Jun-2021, section: 5.1.2.2.3, if
a target requests hot join (HJ), In-Band Interrupt (IBI), or controller
role request (CRR) during the emission of an I3C address in
i3c_device_do_priv_xfers(), the target may win bus arbitration. In such
cases, it is imperative to notify the I3C client driver and retry
i3c_device_do_priv_xfers() after some delay.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20240506164009.21375-1-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i3c/device.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c index 1a6a8703dbc3..e80e48756914 100644 --- a/drivers/i3c/device.c +++ b/drivers/i3c/device.c @@ -27,6 +27,10 @@ * This function can sleep and thus cannot be called in atomic context. * * Return: 0 in case of success, a negative error core otherwise. + * -EAGAIN: controller lost address arbitration. Target + * (IBI, HJ or controller role request) win the bus. Client + * driver needs to resend the 'xfers' some time later. + * See I3C spec ver 1.1.1 09-Jun-2021. Section: 5.1.2.2.3. */ int i3c_device_do_priv_xfers(struct i3c_device *dev, struct i3c_priv_xfer *xfers, |