Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20200820161152.22751-1-eajames@linux.ibm.com> <20200820161152.22751-4-eajames@linux.ibm.com>
In-Reply-To: <20200820161152.22751-4-eajames@linux.ibm.com>
From:   Joel Stanley <joel@jms.id.au>
Date:   Tue, 25 Aug 2020 06:38:10 +0000
Message-ID: <CACPK8XdG1+3eQPQ71fZYZdHwcn8WNLQKF=5iKrOvGhLwispSQA@mail.gmail.com>
Subject: Re: [PATCH 3/5] i2c: aspeed: Mask IRQ status to relevant bits
To:     Eddie James <eajames@linux.ibm.com>
Cc:     linux-input@vger.kernel.org,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-aspeed <linux-aspeed@lists.ozlabs.org>,
        linux-i2c@vger.kernel.org, Andrew Jeffery <andrew@aj.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Brendan Higgins <brendanhiggins@google.com>,
        dmitry.torokhov@gmail.com, Rob Herring <robh+dt@kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, 20 Aug 2020 at 16:12, Eddie James <eajames@linux.ibm.com> wrote:
>
> Mask the IRQ status to only the bits that the driver checks. This
> prevents excessive driver warnings when operating in slave mode
> when additional bits are set that the driver doesn't handle.
>
> Signed-off-by: Eddie James <eajames@linux.ibm.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 31268074c422..abf40f2af8b4 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -604,6 +604,7 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id)
>         writel(irq_received & ~ASPEED_I2CD_INTR_RX_DONE,
>                bus->base + ASPEED_I2C_INTR_STS_REG);
>         readl(bus->base + ASPEED_I2C_INTR_STS_REG);
> +       irq_received &= 0xf000ffff;
>         irq_remaining = irq_received;

This would defeat the check for irq_remaining. I don't think we want to do this.

Can you explain why these bits are being set in slave mode?