[PATCH v4 0/3] console/fbcon: Add support for deferred console takeover
Bartlomiej Zolnierkiewicz
b.zolnierkie at samsung.com
Wed Jun 27 09:47:51 UTC 2018
On Wednesday, June 27, 2018 11:15:20 AM Daniel Vetter wrote:
> On Tue, Jun 26, 2018 at 08:36:09PM +0200, Hans de Goede wrote:
> > Hi All,
> >
> > Here is v4 of my patch-set, to delay fbcon taking over the console (and
> > binding to fbdev devices) until there actually is some text output to the
> > console. This is intended for use with the "quiet" cmdline option, in
> > combination with a bootloader which leaves the vendor's logo /
> > EFI bootgraphics put up by the firmware intact on the EFI framebuffer.
> >
> > The end goal here is a boot where the firmware shows its boot graphics
> > and these stay in place for a couple of seconds until the GUI loads and
> > the GUI then smoothly takes over the framebuffer without any distruptions.
> >
> > This patch-set spans 2 subsystems.
> >
> > Petr, the printk subsys change is really trivial (1 line addition) can we
> > get your Acked-by for merging all 3 patches through the fbdev tree?
> >
> > Changelog:
> >
> > Changes in v4:
> > -Keep the comments about which fbcon functions need locks in place
> >
> > Changes in v3:
> > -Export is_console_locke() for use in modules (as fbcon may be built as a .ko)
> > -Use WARN_CONSOLE_UNLOCKED() in several places in the fbcon code to assert
> > proper locking (requested by Daniel)
> > -Unregister the fbcon-dummycon-output-notifier on fbcon_exit() (req. by Daniel)
> > -Document the fbcon=nodefer commandline option (req. by Emil)
> >
> > Changes in v2:
> > -Check the whole string when checking for erases in putcs, instead of just
> > the first char
> > -Make dummycon_blank return 1, so that a redraw gets triggered and any text
> > rendered while blanked gets output so that it can trigger a deferred
> > takeover if one is pending
>
> Wrt merging I think it'd be best if we stuff this into drm-misc-next -
> that will increase testing by gpu drivers a lot, instead of a suprise when
> the fbdev pull lands in upstream.
>
> Bart, is that ok with you?
Not really, since there are efifb changes in the queue which depend
on this series I would really prefer to merge all patches through
fbdev tree.
Also fbdev tree is pulled into -next kernels so testing coverage
should be okay (I assume that everybody are testing -next kernels in
addition to their own branches :-)..
> Hans, if Bart acks this you can directly push this imo.
> -Daniel
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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