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Subject: Re: [PATCH] i2c: aspeed: Fix initial values of master and slave state
To:     Brendan Higgins <brendanhiggins@google.com>
Cc:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>, linux-i2c@vger.kernel.org,
        OpenBMC Maillist <openbmc@lists.ozlabs.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-aspeed@lists.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        jarkko.nikula@linux.intel.com, james.feist@linux.intel.com,
        vernon.mauery@linux.intel.com
References: <20180702212028.30824-1-jae.hyun.yoo@linux.intel.com>
 <CAFd5g45=SkyLWRy=DnYOZCXcmHkrbTdOSBi=n=kUgyvRPoU8Mg@mail.gmail.com>
From:   Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Message-ID: <37586a32-852c-9b18-cb01-a7448072527c@linux.intel.com>
Date:   Wed, 11 Jul 2018 09:54:44 -0700
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On 7/10/2018 10:47 PM, Brendan Higgins wrote:
> On Mon, Jul 2, 2018 at 2:20 PM Jae Hyun Yoo
> <jae.hyun.yoo@linux.intel.com> wrote:
>>
>> This patch changes the order of enum aspeed_i2c_master_state and
>> enum aspeed_i2c_slave_state defines to make their initial value to
>> ASPEED_I2C_MASTER_INACTIVE and ASPEED_I2C_SLAVE_STOP respectively.
>> In case of multi-master use, if a slave data comes ahead of the
>> first master xfer, master_state starts from an invalid state so
>> this change fixes the issue.
>>
>> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
>> ---
>>   drivers/i2c/busses/i2c-aspeed.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
>> index 60e4d0e939a3..2714c7fbe7c9 100644
>> --- a/drivers/i2c/busses/i2c-aspeed.c
>> +++ b/drivers/i2c/busses/i2c-aspeed.c
>> @@ -111,22 +111,22 @@
>>   #define ASPEED_I2CD_DEV_ADDR_MASK                      GENMASK(6, 0)
>>
>>   enum aspeed_i2c_master_state {
>> +       ASPEED_I2C_MASTER_INACTIVE,
>>          ASPEED_I2C_MASTER_START,
>>          ASPEED_I2C_MASTER_TX_FIRST,
>>          ASPEED_I2C_MASTER_TX,
>>          ASPEED_I2C_MASTER_RX_FIRST,
>>          ASPEED_I2C_MASTER_RX,
>>          ASPEED_I2C_MASTER_STOP,
>> -       ASPEED_I2C_MASTER_INACTIVE,
>>   };
>>
>>   enum aspeed_i2c_slave_state {
>> +       ASPEED_I2C_SLAVE_STOP,
>>          ASPEED_I2C_SLAVE_START,
>>          ASPEED_I2C_SLAVE_READ_REQUESTED,
>>          ASPEED_I2C_SLAVE_READ_PROCESSED,
>>          ASPEED_I2C_SLAVE_WRITE_REQUESTED,
>>          ASPEED_I2C_SLAVE_WRITE_RECEIVED,
>> -       ASPEED_I2C_SLAVE_STOP,
>>   };
>>
>>   struct aspeed_i2c_bus {
>> --
>> 2.17.1
>>
> 
> Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> 
> Thanks!
> 
> BTW, sorry for the delay, just got back from vacation. I will review
> the rest tomorrow.
> 

Thanks a lot for the review!

Jae