[PATCH] serial: 8250_dw: Handle no_console_suspend when uart loses state

[Loic Poulain]

> In certain suspend modes on certain boards the 8250 UART may lose
> state when the device goes to suspend.  If we're using
> no_console_suspend this can cause lots of problems during resume.
>
> Let's cache the basic UART config registers at suspend time and if we
> notice that the UART loses state (by looking at a canary stored in the
> scratch register) we'll restore it.

If I'm not wrong, it's already done in acpi_lpss suspend/resume (for 
8250_dw).
Commit c78b0830667a7e7c1f0ca65b76b33166a84806b3.

Regards,
Loic

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