linux-kernel - Re: [PATCH v2 3/5] i2c: aspeed: Mask IRQ status to relevant bits

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Date:   Tue, 8 Sep 2020 19:59:22 -0700
From:   Tao Ren <rentao.bupt@...il.com>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        linux-i2c@...r.kernel.org, joel@....id.au, andrew@...id.au,
        benh@...nel.crashing.org, brendanhiggins@...gle.com,
        dmitry.torokhov@...il.com, robh+dt@...nel.org, wsa@...nel.org,
        ryan_chen@...eedtech.com
Subject: Re: [PATCH v2 3/5] i2c: aspeed: Mask IRQ status to relevant bits

On Tue, Sep 08, 2020 at 03:00:59PM -0500, Eddie James 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@...ux.ibm.com>

Reviewed-by: Tao Ren <rentao.bupt@...il.com>

> ---
>  drivers/i2c/busses/i2c-aspeed.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index 31268074c422..2a388911038a 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -69,6 +69,7 @@
>   * These share bit definitions, so use the same values for the enable &
>   * status bits.
>   */
> +#define ASPEED_I2CD_INTR_ALL				0xf000ffff
>  #define ASPEED_I2CD_INTR_SDA_DL_TIMEOUT			BIT(14)
>  #define ASPEED_I2CD_INTR_BUS_RECOVER_DONE		BIT(13)
>  #define ASPEED_I2CD_INTR_SLAVE_MATCH			BIT(7)
> @@ -604,6 +605,7 @@ 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 &= ASPEED_I2CD_INTR_ALL;
>  	irq_remaining = irq_received;
>  
>  #if IS_ENABLED(CONFIG_I2C_SLAVE)
> -- 
> 2.26.2
>