Atm the MST encoder config computation may use an out-of-date pbn_div
value, if the sink is unplugged and a sink is replugged with different
link rate/lane count capabilities. The current way of reinitializing
pbn_div depends on pbn_div getting cleared via intel_atomic_check() ->
drm_dp_mst_atomic_check() ->
drm_dp_mst_atomic_check_payload_alloc_limits(), however the clearing
won't happen if the sink got unplugged (and hence
drm_dp_mst_topology_mgr::mst_state being false).
To fix the above, simply update pbn_div unconditionally during config
computation, making pbn_div always match the link rate and lane count.
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 648cf37e02a87..42ddfc85d72d6 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -94,12 +94,9 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
crtc_state->lane_count = limits->max_lane_count;
crtc_state->port_clock = limits->max_rate;
- // TODO: Handle pbn_div changes by adding a new MST helper
- if (!mst_state->pbn_div) {
- mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
- crtc_state->port_clock,
- crtc_state->lane_count);
- }
+ mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
+ crtc_state->port_clock,
+ crtc_state->lane_count);
for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);
--
2.39.2
