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

Brendan Higgins brendanhiggins at google.com
Thu Oct 10 11:32:34 AEDT 2019

On Wed, Oct 09, 2019 at 02:20:34PM -0700, 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>

Reviewed-by: Brendan Higgins <brendanhiggins at google.com>

We don't have any multi-master setups, can we get a Tested-by?

Wolfram, since this is a bugfix, can we get this in 5.4?


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