linux-kernel - Re: [PATCH v3 3/5] i2c: aspeed: Mask IRQ status to relevant bits

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Date:   Thu, 10 Sep 2020 08:55:38 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     linux-input@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        linux-i2c@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        wsa@...nel.org, rentao.bupt@...il.com,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH v3 3/5] i2c: aspeed: Mask IRQ status to relevant bits


On 9/10/20 4:00 AM, Brendan Higgins wrote:
> On Wed, Sep 9, 2020 at 1:31 PM Eddie James <eajames@...ux.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@...ux.ibm.com>
>> Reviewed-by: Tao Ren <rentao.bupt@...il.com>
> Sorry, looks like I didn't get my comment in in time.
>
> Looks good in principle. One minor comment below:
>
>> ---
>>   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..724bf30600d6 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_RECV_MASK                     0xf000ffff
> Could we define ASPEED_I2CD_INTR_RECV_MASK to be ASPEED_I2CD_INTR_ALL ?


That was my original thought... there is another define for that already 
a few lines down though.


Thanks,

Eddie


>
>>   #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_RECV_MASK;
>>          irq_remaining = irq_received;
>>
>>   #if IS_ENABLED(CONFIG_I2C_SLAVE)
>> --
>> 2.26.2
>>