[PATCH] i2c: aspeed: fix master pending state handling

[Tao Ren]

On 10/9/19 2:20 PM, Jae Hyun Yoo wrote:
> In case of master pending state, it should not trigger a master
> command, otherwise data could be corrupted because this H/W shares
> the same data buffer for slave and master operations. It also means
> that H/W command queue handling is unreliable because of the buffer
> sharing issue. To fix this issue, it clears command queue if a
> master command is queued in pending state to use S/W solution
> instead of H/W command queue handling. Also, it refines restarting
> mechanism of the pending master command.
> 
> Fixes: 2e57b7cebb98 ("i2c: aspeed: Add multi-master use case support")
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>

Tested-by: Tao Ren <taoren at fb.com>

Tested the patch on Facebook Minipack BMC (multi-master i2c-0 environment) and
everything looks good to me.


Cheers,

Tao