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drm/nouveau/kms/nv50-: Move 8BPC limit for MST into nv50_mstc_get_modes()

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This just limits the BPC for MST connectors to a maximum of 8 from
nv50_mstc_get_modes(), instead of doing so during
nv50_msto_atomic_check(). This doesn't introduce any functional changes
yet (other then userspace now lying about the max bpc, but we can't
support that yet anyway so meh). But, we'll need this in a moment so
that we can share mode validation between SST and MST which will fix
some real world issues.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Lyude Paul 2020-05-11 18:41:26 -04:00 committed by Ben Skeggs
parent af620cf083
commit bbdf6a5891
1 changed files with 14 additions and 11 deletions
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25
drivers/gpu/drm/nouveau/dispnv50/disp.c
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@ -908,15 +908,9 @@ nv50_msto_atomic_check(struct drm_encoder *encoder,
if (!state->duplicated) {
const int clock = crtc_state->adjusted_mode.clock;
/*
* XXX: Since we don't use HDR in userspace quite yet, limit
* the bpc to 8 to save bandwidth on the topology. In the
* future, we'll want to properly fix this by dynamically
* selecting the highest possible bpc that would fit in the
* topology
*/
asyh->or.bpc = min(connector->display_info.bpc, 8U);
asyh->dp.pbn = drm_dp_calc_pbn_mode(clock, asyh->or.bpc * 3, false);
asyh->or.bpc = connector->display_info.bpc;
asyh->dp.pbn = drm_dp_calc_pbn_mode(clock, asyh->or.bpc * 3,
false);
}
slots = drm_dp_atomic_find_vcpi_slots(state, &mstm->mgr, mstc->port,
@ -1076,8 +1070,17 @@ nv50_mstc_get_modes(struct drm_connector *connector)
if (mstc->edid)
ret = drm_add_edid_modes(&mstc->connector, mstc->edid);
if (!mstc->connector.display_info.bpc)
mstc->connector.display_info.bpc = 8;
/*
* XXX: Since we don't use HDR in userspace quite yet, limit the bpc
* to 8 to save bandwidth on the topology. In the future, we'll want
* to properly fix this by dynamically selecting the highest possible
* bpc that would fit in the topology
*/
if (connector->display_info.bpc)
connector->display_info.bpc =
clamp(connector->display_info.bpc, 6U, 8U);
else
connector->display_info.bpc = 8;
if (mstc->native)
drm_mode_destroy(mstc->connector.dev, mstc->native);