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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>
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@ -27,6 +27,10 @@
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* This function can sleep and thus cannot be called in atomic context.
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*
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* Return: 0 in case of success, a negative error core otherwise.
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* -EAGAIN: controller lost address arbitration. Target
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* (IBI, HJ or controller role request) win the bus. Client
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* driver needs to resend the 'xfers' some time later.
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* See I3C spec ver 1.1.1 09-Jun-2021. Section: 5.1.2.2.3.
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*/
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int i3c_device_do_priv_xfers(struct i3c_device *dev,
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struct i3c_priv_xfer *xfers,
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