On 28/09/2020 21:12, Kazlauskas, Nicholas wrote:
DRM modes don't specify the encoding. The property as part of this patch
lets userspace override it but the userspace GUI support isn't there on
Wayland IIRC.
I'm fine with adding the properties but I don't think the module
parameter is the right solution here. I think it's better if we try to
get this into atomic userspace as well or revive efforts that have been
already started before.
The problem with the module parameters is that it'd be applying a
default to every DRM connector. No way to specify different defaults per
DRM connector, nor do we know the full connector set at driver
initialization. The list is dynamic and can change when you plug/unplug
MST displays.
What about using the existing "video=" kernel command-line option? I
looks like this acts at the DRM level and is a driver-neutral mechanism
for specifying defaults on a per-connector basis.
It also has a straightforward means for parsing additional arbitrary
options that could be used -- from what I can make out this would
require adding pixel encoding to struct drm_cmdline_mode.
Regards,
-James
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