linux-kernel - Re: [PATCH] i2c: aspeed: Fix the dummy irq expected print

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Date: Wed, 21 Feb 2024 22:14:46 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: Tommy Huang <tommy_huang@...eedtech.com>
Cc: brendan.higgins@...ux.dev, p.zabel@...gutronix.de, 
	linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org, benh@...nel.crashing.org, 
	joel@....id.au, andrew@...id.au, linux-arm-kernel@...ts.infradead.org, 
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, BMC-SW@...eedtech.com
Subject: Re: [PATCH] i2c: aspeed: Fix the dummy irq expected print

Hi Tommy,

On Fri, Feb 16, 2024 at 08:04:55PM +0800, Tommy Huang wrote:
> When the i2c error condition occurred and master state was not idle,
> the master irq function will goto complete state without any other
> interrupt handling. It would cause dummy irq expected print. Under
> this condition, assign the irq_status into irq_handle.

I'm sorry, but I don't understand much from your log here.

Do you mean that irq_handled in aspeed_i2c_master_irq() is left
with some states that is not supposed to have and then you
end up printing here:

	dev_err(bus->dev,
		"irq handled != irq. expected 0x%08x, but was 0x%08x\n",
		irq_received, irq_handled);

Can you please explain better?

If that's the case, wouldn't it make more sense to check for 
bus->master_state != ASPEED_I2C_MASTER_INACTIVE) earlier?

And, still, If that's the case, I believe you might need the
Fixes tag. It's true that you are not really failing, but you are
not reporting a failure by mistake.

Thanks,
Andi

> Signed-off-by: Tommy Huang <tommy_huang@...eedtech.com>
> ---
>  drivers/i2c/busses/i2c-aspeed.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index 5511fd46a65e..ce8c4846b7fa 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -445,6 +445,7 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
>  			irq_status);
>  		irq_handled |= (irq_status & ASPEED_I2CD_INTR_MASTER_ERRORS);
>  		if (bus->master_state != ASPEED_I2C_MASTER_INACTIVE) {
> +			irq_handled = irq_status;
>  			bus->cmd_err = ret;
>  			bus->master_state = ASPEED_I2C_MASTER_INACTIVE;
>  			goto out_complete;
> -- 
> 2.25.1
>