On Tue, 07 Jun 2022, Lyude Paul <lyude@xxxxxxxxxx> wrote: > Ugh, thanks ./scripts/get_maintainers.pl for confusing and breaking > git-send email <<. Sorry for the resend everyone. > > For quite a while we've been carrying around a lot of legacy modesetting > code in the MST helpers that has been rather annoying to keep around, > and very often gets in the way of trying to implement additional > functionality in MST such as fallback link rate retraining, dynamic BPC > management and DSC support, etc. because of the fact that we can't rely > on atomic for everything. > > Luckily, we only actually have one user of the legacy MST code in the > kernel - radeon. Originally I was thinking of trying to maintain this > code and keep it around in some form, but I'm pretty unconvinced anyone > is actually using this. My reasoning for that is because I've seen > nearly no issues regarding MST on radeon for quite a while now - despite > the fact my local testing seems to indicate it's quite broken. This > isn't too surprising either, as MST support in radeon.ko is gated behind > a module parameter that isn't enabled by default. This isn't to say I > wouldn't be open to alternative suggestions, but I'd rather not be the > one to have to spend time on that if at all possible! Plus, I already > floated the idea of dropping this code by AMD folks a few times and > didn't get much resistance. > > As well, this series has some basic refactoring that I did along the way > and some bugs I had to fix in order to get my atomic-only MST code > working. Most of this is pretty straight forward and simply renaming > things to more closely match the DisplayPort specification, as I think > this will also make maintaining this code a lot easier in the long run > (I've gotten myself confused way too many times because of this). > > So far I've tested this on all three MST drivers: amdgpu, i915 and > nouveau, along with making sure that removing the radeon MST code > doesn't break anything else. The one thing I very much could use help > with regarding testing though is making sure that this works with > amdgpu's DSC support on MST. > > So, with this we should be using the atomic state as much as possible > with MST modesetting, hooray! I admit and regret I haven't had the time to go through this in detail and thought. I've glanced over it on a few occasions, and I don't have anything against it really. Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx> Before merging, please ensure you've sent the entire series Cc'd intel-gfx, and got a green light from CI. > > Cc: Wayne Lin <Wayne.Lin@xxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Cc: Fangzhi Zuo <Jerry.Zuo@xxxxxxx> > Cc: Jani Nikula <jani.nikula@xxxxxxxxx> > Cc: Imre Deak <imre.deak@xxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Sean Paul <sean@xxxxxxxxxx> > > Lyude Paul (18): > drm/amdgpu/dc/mst: Rename dp_mst_stream_allocation(_table) > drm/amdgpu/dm/mst: Rename get_payload_table() > drm/display/dp_mst: Rename drm_dp_mst_vcpi_allocation > drm/display/dp_mst: Call them time slots, not VCPI slots > drm/display/dp_mst: Fix confusing docs for > drm_dp_atomic_release_time_slots() > drm/display/dp_mst: Add some missing kdocs for atomic MST structs > drm/display/dp_mst: Add helper for finding payloads in atomic MST > state > drm/display/dp_mst: Add nonblocking helpers for DP MST > drm/display/dp_mst: Don't open code modeset checks for releasing time > slots > drm/display/dp_mst: Fix modeset tracking in > drm_dp_atomic_release_vcpi_slots() > drm/nouveau/kms: Cache DP encoders in nouveau_connector > drm/nouveau/kms: Pull mst state in for all modesets > drm/display/dp_mst: Add helpers for serializing SST <-> MST > transitions > drm/display/dp_mst: Drop all ports from topology on CSNs before > queueing link address work > drm/display/dp_mst: Skip releasing payloads if last connected port > isn't connected > drm/display/dp_mst: Maintain time slot allocations when deleting > payloads > drm/radeon: Drop legacy MST support > drm/display/dp_mst: Move all payload info into the atomic state > > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 72 +- > .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 111 +- > .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 126 +- > drivers/gpu/drm/amd/display/dc/core/dc_link.c | 10 +- > drivers/gpu/drm/amd/display/dc/dm_helpers.h | 4 +- > .../amd/display/include/link_service_types.h | 18 +- > drivers/gpu/drm/display/drm_dp_mst_topology.c | 1160 ++++++++--------- > drivers/gpu/drm/i915/display/intel_display.c | 11 + > drivers/gpu/drm/i915/display/intel_dp.c | 9 + > drivers/gpu/drm/i915/display/intel_dp_mst.c | 91 +- > drivers/gpu/drm/i915/display/intel_hdcp.c | 24 +- > drivers/gpu/drm/nouveau/dispnv50/disp.c | 202 ++- > drivers/gpu/drm/nouveau/dispnv50/disp.h | 2 + > drivers/gpu/drm/nouveau/nouveau_connector.c | 18 +- > drivers/gpu/drm/nouveau/nouveau_connector.h | 3 + > drivers/gpu/drm/radeon/Makefile | 2 +- > drivers/gpu/drm/radeon/atombios_crtc.c | 11 +- > drivers/gpu/drm/radeon/atombios_encoders.c | 59 - > drivers/gpu/drm/radeon/radeon_atombios.c | 2 - > drivers/gpu/drm/radeon/radeon_connectors.c | 61 +- > drivers/gpu/drm/radeon/radeon_device.c | 1 - > drivers/gpu/drm/radeon/radeon_dp_mst.c | 778 ----------- > drivers/gpu/drm/radeon/radeon_drv.c | 4 - > drivers/gpu/drm/radeon/radeon_encoders.c | 14 +- > drivers/gpu/drm/radeon/radeon_irq_kms.c | 10 +- > drivers/gpu/drm/radeon/radeon_mode.h | 40 - > include/drm/display/drm_dp_mst_helper.h | 230 ++-- > 27 files changed, 991 insertions(+), 2082 deletions(-) > delete mode 100644 drivers/gpu/drm/radeon/radeon_dp_mst.c -- Jani Nikula, Intel Open Source Graphics Center
