linux-kernel - Re: [PATCH] mailbox: omap: request shared interrupt to fix initialization

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Date: Wed, 19 Jun 2024 11:13:28 -0500
From: Andrew Davis <afd@...com>
To: Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Jassi Brar
	<jassisinghbrar@...il.com>
CC: <linux-kernel@...r.kernel.org>, <linux@...tq-group.com>
Subject: Re: [PATCH] mailbox: omap: request shared interrupt to fix
 initialization

On 6/19/24 6:52 AM, Matthias Schiffer wrote:
> The TI AM64x and similar SoC families have mailboxes with two channels
> each which share the same IRQ. The IRQ must thus be requested with
> IRQF_SHARED, or initializing the second channel will fail.
> 
> Fixes: 3f58c1f4206f ("mailbox: omap: Remove kernel FIFO message queuing")
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> ---

Looks like we found the same issue, already sent the same fix last week:

https://www.spinics.net/lists/kernel/msg5247681.html

>   drivers/mailbox/omap-mailbox.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
> index 46747559b438f..03187c65f98bf 100644
> --- a/drivers/mailbox/omap-mailbox.c
> +++ b/drivers/mailbox/omap-mailbox.c
> @@ -230,7 +230,7 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
>   	int ret = 0;
>   
>   	ret = request_threaded_irq(mbox->irq, NULL, mbox_interrupt,
> -				   IRQF_ONESHOT, mbox->name, mbox);
> +				   IRQF_ONESHOT | IRQF_SHARED, mbox->name, mbox);
>   	if (unlikely(ret)) {
>   		pr_err("failed to register mailbox interrupt:%d\n", ret);
>   		return ret;