Ville Syrjälä aeb47df357
drm/i915: Clean up the bigjoiner state copy logic ...
Currently the bigjoiner state copy logic is kind of
a byzantine mess.
Clean it up to operate in the following manner during a full
modeset:
1) master uapi -> hw state copy
2) master hw -> slave hw state copy
And during a non-modeset update we do:
1) master uapi -> hw state light copy
2) master hw -> slave hw state light copy
I think that is now easier to reason about since we never do
any kind of master uapi -> slave hw state copy short circuit
that could happen previously.
Obviously this does now depend on the master uapi->hw copy
always happening before the master hw -> slave hw copy, but
that is guaranteed by the fact that we always add both crtcs
to the state early, the crtcs are registered in pipe
order (so the compute_config loop happens in pipe order),
and the hardware requires the master pipe has to be lower
than the slave pipe as well. And for good measure we shall
add a check+WARN for this before doing the bigjoiner crtc
assignment.
v2: Fix uapi.ctm vs. hw.ctm copy-paste fail
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com >
Link: https://patchwork.freedesktop.org/patch/msgid/20220204072049.1610-1-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com >
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