[PATCH 00/12] drm/modes: parse_cmdline: Add support for specifying panel_orientation on the kernel cmdline

[Hans de Goede]

Hi All,

I've been thinking about adding support for overriding a connector's
panel-orientation from the kernel commandline from a while now. Both for
testing and for special cases, e.g. a kiosk like setup which uses a TV
mounted in portrait mode.

Then this plymouth merge-req came in:
"Force display orientation using configuration file"
https://gitlab.freedesktop.org/plymouth/plymouth/merge_requests/83

Which was the trigger for me to actually do this. This turned out to be
a bit more work then expected as I wanted users to be able to specify
the new "panel_orientation" option as a freestanding option, without
needing to prefix a resolution; and when working on that I stumbled over
various things which could be improved in the cmdline parsing code.

This patch-seet is the end result of all this. Amongst other tests,
it has been tested with the test-drm_cmdline_parser.ko selftest and it
adds some new tests to that in some of the patches.

Regards,

Hans