[PATCH 1/3] i3c: mipi-i3c-hci: Enable IBI threshold interrupt by default in PIO mode

[Frank Li]

On Thu, Jul 09, 2026 at 03:17:42PM +0800, Jian-Ming Liao wrote:
> Enable the IBI threshold interrupt (STAT_IBI_STATUS_THLD) by default
> during PIO initialization. This ensures that Hot-Join requests and
> early IBIs from devices that have not yet formally requested routing

Do you means not call i3c_device_request_ibi()?

Frank
> are properly captured, improving system responsiveness and stability.
>
> Co-developed-by: Patrick Yen <Patrick_Yen at asmedia.com.tw>
> Signed-off-by: Patrick Yen <Patrick_Yen at asmedia.com.tw>
> Signed-off-by: Jian-Ming Liao <Jm_Liao at asmedia.com.tw>
> ---
>  drivers/i3c/master/mipi-i3c-hci/pio.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i3c/master/mipi-i3c-hci/pio.c b/drivers/i3c/master/mipi-i3c-hci/pio.c
> index ff2657ee220b..7870b2c7888f 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/pio.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/pio.c
> @@ -185,8 +185,13 @@ static void __hci_pio_init(struct i3c_hci *hci, u32 *size_val_ptr)
>  	pio_reg_write(INTR_SIGNAL_ENABLE, 0x0);
>  	pio_reg_write(INTR_STATUS_ENABLE, 0xffffffff);
>
> -	/* Always accept error interrupts (will be activated on first xfer) */
> -	pio->enabled_irqs = STAT_ALL_ERRORS;
> +	/*
> +	 * Always accept error interrupts (will be activated on first xfer).
> +	 * Also enable IBI threshold interrupt by default to catch Hot-Join
> +	 * requests and IBIs from devices that haven't formally requested
> +	 * IBI routing yet.
> +	 */
> +	pio->enabled_irqs = STAT_ALL_ERRORS | STAT_IBI_STATUS_THLD;
>  }
>
>  static void hci_pio_suspend(struct i3c_hci *hci)
> --
> 2.43.0
>
>
> --
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