Re: [PATCH 1/5] i3c: master: Move rstdaa error suppression

From: Adrian Hunter <adrian.hunter@intel.com>
To: "Jorge Marques" <jorge.marques@analog.com>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Frank Li" <Frank.Li@nxp.com>,
	"Przemysław Gaj" <pgaj@cadence.com>
Cc: <linux-i3c@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	"Dan Carpenter" <dan.carpenter@linaro.org>,
	Jonathan Cameron <jic23@kernel.org>
Subject: Re: [PATCH 1/5] i3c: master: Move rstdaa error suppression
Date: Mon, 9 Mar 2026 13:39:36 +0200	[thread overview]
Message-ID: <458bbbb3-babd-45d2-b290-435811058ba3@intel.com> (raw)
In-Reply-To: <20260308-ad4062-positive-error-fix-v1-1-72d3c5290b4a@analog.com>

On 08/03/2026 18:47, Jorge Marques wrote:
> The CCC RSTDAA is invoked with i3c_master_rstdaa_locked
> even if there are no devices active on the bus, resulting
> in error I3C_ERROR_M2. Handle inside i3c_master_rstdaa_locked,
> checking cmd->err directly.
> 
> Signed-off-by: Jorge Marques <jorge.marques@analog.com>
> ---
>  drivers/i3c/master.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 9e6be49bebb2..31822fd5ffde 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1016,6 +1016,10 @@ 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);
>  
> +	/* No active devices on the bus. */
> +	if (ret && cmd.err == I3C_ERROR_M2)
> +		ret = 0;
> +
>  	return ret;
>  }
>  
> @@ -1785,7 +1789,6 @@ i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
>   */
>  int i3c_master_do_daa_ext(struct i3c_master_controller *master, bool rstdaa)
>  {
> -	int rstret = 0;
>  	int ret;
>  
>  	ret = i3c_master_rpm_get(master);
> @@ -1795,9 +1798,9 @@ int i3c_master_do_daa_ext(struct i3c_master_controller *master, bool rstdaa)
>  	i3c_bus_maintenance_lock(&master->bus);
>  
>  	if (rstdaa) {
> -		rstret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
> -		if (rstret == I3C_ERROR_M2)
> -			rstret = 0;
> +		ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
> +		if (ret)
> +			goto out;

This is an unrelated change.  The original intention was to perform
DAA even if RSTDAA fails.  If you really want this, it needs to be
a separate patch with separate justification.

>  	}
>  
>  	ret = master->ops->do_daa(master);
> @@ -1813,7 +1816,7 @@ int i3c_master_do_daa_ext(struct i3c_master_controller *master, bool rstdaa)
>  out:
>  	i3c_master_rpm_put(master);
>  
> -	return rstret ?: ret;
> +	return ret;

Ditto

>  }
>  EXPORT_SYMBOL_GPL(i3c_master_do_daa_ext);
>  
> @@ -2093,7 +2096,7 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
>  	 * (assigned by the bootloader for example).
>  	 */
>  	ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
> -	if (ret && ret != I3C_ERROR_M2)
> +	if (ret)
>  		goto err_bus_cleanup;
>  
>  	if (master->ops->set_speed) {
> 

-- 
linux-i3c mailing list
linux-i3c@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-i3c