[PATCH] serial: 8250_dw: Handle no_console_suspend when uart loses state
From: Loic Poulain <hidden>
Date: 2014-11-17 08:53:30
Also in:
linux-serial, lkml
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/