[PATCH 2/4] i3c: mipi-i3c-hci: Fix handling status of i3c_hci_irq_handler()

[Frank Li]

On Fri, Feb 28, 2025 at 04:18:00PM +0200, Jarkko Nikula wrote:
> Return IRQ_HANDLED from the i3c_hci_irq_handler() only if some
> INTR_STATUS bit was set or if DMA/PIO handler handled it.
>
> Currently it returns IRQ_HANDLED in case INTR_STATUS is zero and IO
> handler returns false. Which could be the case if interrupt comes from
> other device or is spurious.
>
> Signed-off-by: Jarkko Nikula <jarkko.nikula at linux.intel.com>
> ---
>  drivers/i3c/master/mipi-i3c-hci/core.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
> index e139d7e4d252..e5593b6e897e 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/core.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/core.c
> @@ -594,6 +594,7 @@ static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id)
>
>  	if (val) {
>  		reg_write(INTR_STATUS, val);
> +		result = IRQ_HANDLED;

Not related this patch.
reg_write(INTR_STATUS, val); should be unconditional since INTR_STATUS is
w1c.

I am strange why need return IRQ_NONE case. I suppose it should always
return IRQ_HANDLED.

Frank
>  	}
>
>  	if (val & INTR_HC_RESET_CANCEL) {
> @@ -605,12 +606,11 @@ static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id)
>  		val &= ~INTR_HC_INTERNAL_ERR;
>  	}
>
> -	hci->io->irq_handler(hci);
> +	if (hci->io->irq_handler(hci))
> +		result = IRQ_HANDLED;
>
>  	if (val)
>  		dev_err(&hci->master.dev, "unexpected INTR_STATUS %#x\n", val);
> -	else
> -		result = IRQ_HANDLED;
>
>  	return result;
>  }
> --
> 2.47.2
>
>
> --
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