> 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 -- Intel Open Source Technology Center http://oss.intel.com/
