[PATCH] i3c: dw: reduce do_daa time if there's no client

[Frank Li]

On Mon, Aug 03, 2026 at 10:03:07PM +0800, Jisheng Zhang wrote:
> If there's no client, wait for completion will timeout, then there's no
> need to add i3c dev at all. This can save boot time by ~6s if there's
> no client connected to the i3c interface.
>
> Signed-off-by: Jisheng Zhang <jszhang at kernel.org>
> ---
>  drivers/i3c/master/dw-i3c-master.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> index 0625587f1527..18ebf304029a 100644
> --- a/drivers/i3c/master/dw-i3c-master.c
> +++ b/drivers/i3c/master/dw-i3c-master.c
> @@ -885,8 +885,10 @@ static int dw_i3c_master_daa(struct i3c_master_controller *m)
>  		      COMMAND_PORT_ROC;
>
>  	dw_i3c_master_enqueue_xfer(master, xfer);
> -	if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
> +	if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT)) {
>  		dw_i3c_master_dequeue_xfer(master, xfer);
> +		goto rpm_out;

not sure why save 6s. timeout already happen, does register i3c device
takes 6s?

And if do_daa find 3 devices, then timeout, you skip register found 3
devices.

Frank

> +	}
>
>  	newdevs = GENMASK(master->maxdevs - cmd->rx_len - 1, 0);
>  	newdevs &= ~olddevs;
> --
> 2.53.0
>