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i3c: Add comment for -EAGAIN in i3c_device_do_priv_xfers()

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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>
This commit is contained in:
Frank Li 2024-05-06 12:40:07 -04:00 committed by Alexandre Belloni
parent 4cece76496
commit 0d25965082
1 changed files with 4 additions and 0 deletions
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4
drivers/i3c/device.c
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@ -27,6 +27,10 @@
* This function can sleep and thus cannot be called in atomic context. * This function can sleep and thus cannot be called in atomic context.
* *
* Return: 0 in case of success, a negative error core otherwise. * 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, int i3c_device_do_priv_xfers(struct i3c_device *dev,
struct i3c_priv_xfer *xfers, struct i3c_priv_xfer *xfers,