linux-kernel - [PATCH v2 1/2] i3c: master: fixes i3c bus driver probe failure if no i3c device attached

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Date:   Wed, 30 Aug 2023 10:17:26 -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 1/2] i3c: master: fixes i3c bus driver probe failure if no i3c device attached

In i3c_master_bus_init()
{	...
	ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
	if (ret && ret != I3C_ERROR_M2)
			  ^^^ // it is enum i3c_error_code
	...
}

In dw-i3c-master.c implementation:
dw_i3c_ccc_set()
{	...
	ret = xfer->ret;
	if (xfer->cmds[0].error == RESPONSE_ERROR_IBA_NACK)
		ccc->err = I3C_ERROR_M2;

	dw_i3c_master_free_xfer(xfer);

	return ret;
}

Return enum i3c_error_code when error happen in i3c_master_rstdaa_locked().

Cc: stable@...r.kernel.org
Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure")
Signed-off-by: Frank Li <Frank.Li@....com>
---

Notes:
    Change from v1 to v2:
    - cc stable

 drivers/i3c/master.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 08aeb69a78003..00a82f3ab9ac0 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -783,6 +783,9 @@ static int i3c_master_rstdaa_locked(struct i3c_master_controller *master,
 	ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 	i3c_ccc_cmd_dest_cleanup(&dest);
 
+	if (ret)
+		ret = cmd.err;
+
 	return ret;
 }
 
-- 
2.34.1