niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

drm/i915/dp_mst: Fix encoder HW state readout for UHBR MST

Browse source 
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: 35d2e4b756 ("drm/i915/ddi: start distinguishing 128b/132b SST and MST at state readout")
Fixes: 40d489fac0 ("drm/i915/ddi: handle 128b/132b SST in intel_ddi_read_func_ctl()")
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250224093242.1859583-1-imre.deak@intel.com
(cherry picked from commit 0159e311772af9d6598aafe072c020687720f1d7)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Imre Deak 2025-02-24 11:32:42 +02:00 • committed by Rodrigo Vivi
parent d082ecbc71
commit 16fef33fdb
No known key found for this signature in database
GPG key ID: FA625F640EEB13CA
1 changed files with 5 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/gpu/drm/i915/display/intel_ddi.c
View file

@ -866,7 +866,7 @@ 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
@ -878,7 +878,8 @@ 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;
}
@ -4151,13 +4152,13 @@ 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);