i2c error for ME port

[Jae Hyun Yoo]

On 11/25/2019 3:37 PM, Vijay Khemka wrote:
> 
> 
> On 11/25/19, 3:21 PM, "Jae Hyun Yoo" <jae.hyun.yoo at linux.intel.com> wrote:
> 
>      > &i2c4 {
>      >    status = "okay";
>      >    // BMC Debug Header
>      >    ipmb0 at 10 {
>      >      compatible = "ipmb-dev";
>      >      reg = <0x10>;
>      >      i2c-protocol;
>      >    };
>      > };
>      
>      If it's for BMC-ME channel, you should add 'multi-master;' to enable H/W
>      arbitration. Also, you should set the slave address like below after
>      including '#include <dt-bindings/i2c/i2c.h>' in dts file.
>      
>      reg = <(0x10 | I2C_OWN_SLAVE_ADDRESS)>;
>      
> I changed to this
> &i2c4 {
>    status = "okay";
>    multi-master;
>    // BMC Debug Header
>    ipmb0 at 10 {
>      compatible = "ipmb-dev";

What happens if you use "slave-mqueue" instead? Are you modifying IPMB
channel support using the ipmb kernel driver?

>      reg = <0x40000010>;
>      i2c-protocol;
>    };
> };
> But no improvement. In fact sometimes I am unable to communicate with ME via i2c.
>      Cheers,
>      
>      Jae
>      
>