FSL serial 166550 errata broken?

[York Sun]

On 09/25/2017 09:55 AM, Joakim Tjernlund wrote:
> We got some "broken" boards(mpx8321) where UART RX is held low(BREAK)
> There we get a few:
>    serial8250: too much work for irq18
> and the board freezes.
> 
> Looking inte to driver/CPU there is an errtum(A-004737) w.r.t BREAK handling
> and I can see we are hitting the irq function fsl8250_handle_irq() added
> in commit: 9deaa53ac7fa373623123aa4f18828dd62292b1a
>   "serial: add irq handler for Freescale 16550 errata."
> For all I can tell this workaround is broken and I cannot figure out why.
> Any pointers?
> 

Jocke,

Did you mean MPC8321?

I personally don't have experience debugging this erratum. Have you 
tried to contact the patch author Paul Gortmaker to see how he managed 
to get it work?

York