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Message-Id: <20240506164009.21375-1-Frank.Li@nxp.com>
Date: Mon, 6 May 2024 12:40:07 -0400
From: Frank Li <Frank.Li@....com>
To: miquel.raynal@...tlin.com
Cc: Frank.Li@....com,
alexandre.belloni@...tlin.com,
conor.culhane@...vaco.com,
imx@...ts.linux.dev,
linux-i3c@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] 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@....com>
---
Notes:
Change from v1 to v2
- new patch
drivers/i3c/device.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c
index 1a6a8703dbc3a..b04a55a1337d4 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 need resend this '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,
--
2.34.1
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