Re: [PATCH v2 0/4] Introduce HONOR MagicBook Art 14 device tree

[Valentin Manea <valentin.manea@mrs.ro>]

Hi
> I'm using it with an external display connected to the HDMI port as > a daily driver for quite some time now. > > eDP support is broken 
(screen is eigher grey or grey with noise), > thus, keeping it disabled 
for now.
The reason for the eDP problems is that the firmware enables DSC for
the panel at boot, but the msm driver does not yet support it. There are
some patches floating around to add the functionality but they seem to
have some problems. In the repo with my name that you quoted I have
integrated them for testing, but as they are they already have been
rejected for mainline, so I think we just need to wait for qualcomm or
linaro to finish their work.
Now I have a simpler solution for this problem, I just made a copy of the
one of the eDP panel drivers and do a force disable of DSC on resume,
which seems to work perfectly fine, there is enough bandwidth to
drive the panel even at 120Hz even with DSC disabled. You can find my
patch in the quoted repository in the qcom-x1e-7.0 branch.


If this is an acceptable solution I will cleanup the patch more and
post it here. Perhaps the other solution is for the msm driver to
disable DSC explicitly for panels that advertise it, because it might
be enabled by bootloaders/firmware.

Valentin