The encoder HW/SW state verification should use a SW state which stays
unchanged while the encoder/output is active. The intel_dp::is_mst flag
used during state computation to choose between the DP SST/MST modes can
change while the output is active, if the sink gets disconnected or the
MST topology is removed for another reason. A subsequent state
verification using intel_dp::is_mst leads then to a mismatch if the
output is disabled/re-enabled without recomputing its state.
Use the encoder's active MST link count instead, which will be always
non-zero for an active MST output and will be zero for SST.
Fixes: 35d2e4b75649 ("drm/i915/ddi: start distinguishing 128b/132b SST and MST at state readout")
Fixes: 40d489fac0e8 ("drm/i915/ddi: handle 128b/132b SST in intel_ddi_read_func_ctl()")
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 7937f4de66cb4..8c8b53414da67 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -890,7 +890,7 @@ static void intel_ddi_get_encoder_pipes(struct intel_encoder *encoder,
encoder->base.base.id, encoder->base.name);
if (!mst_pipe_mask && dp128b132b_pipe_mask) {
- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
/*
* If we don't have 8b/10b MST, but have more than one
@@ -902,7 +902,8 @@ static void intel_ddi_get_encoder_pipes(struct intel_encoder *encoder,
* we don't expect MST to have been enabled at that point, and
* can assume it's SST.
*/
- if (hweight8(dp128b132b_pipe_mask) > 1 || intel_dp->is_mst)
+ if (hweight8(dp128b132b_pipe_mask) > 1 ||
+ intel_dp_mst_encoder_active_links(dig_port))
mst_pipe_mask = dp128b132b_pipe_mask;
}
@@ -4131,13 +4132,13 @@ static void intel_ddi_read_func_ctl(struct intel_encoder *encoder,
} else if (ddi_mode == TRANS_DDI_MODE_SELECT_DP_MST) {
intel_ddi_read_func_ctl_dp_mst(encoder, pipe_config, ddi_func_ctl);
} else if (ddi_mode == TRANS_DDI_MODE_SELECT_FDI_OR_128B132B && HAS_DP20(display)) {
- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
/*
* If this is true, we know we're being called from mst stream
* encoder's ->get_config().
*/
- if (intel_dp->is_mst)
+ if (intel_dp_mst_encoder_active_links(dig_port))
intel_ddi_read_func_ctl_dp_mst(encoder, pipe_config, ddi_func_ctl);
else
intel_ddi_read_func_ctl_dp_sst(encoder, pipe_config, ddi_func_ctl);
--
2.44.2
