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drm/i915/mst: adapt intel_dp_mtp_tu_compute_config() for 128b/132b SST

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Handle 128b/132b SST in intel_dp_mtp_tu_compute_config(). The remote
bandwidth overhead and time slot allocation are only relevant for MST;
SST only needs the local bandwidth and a check that 64 slots isn't
exceeded.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b59c94b0aac2c073b0306c0a0040b26330f94260.1735912293.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2025-01-03 15:52:30 +02:00
parent 1ed21a66ec
commit f6971d7427
1 changed files with 58 additions and 45 deletions
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25
drivers/gpu/drm/i915/display/intel_dp_mst.c
View file

@ -257,10 +257,7 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
int local_bw_overhead;
int remote_bw_overhead;
int link_bpp_x16;
int remote_tu;
fixed20_12 pbn;
drm_dbg_kms(display->drm, "Trying bpp %d\n", bpp);
@ -269,14 +266,19 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state,
false, dsc_slice_count, link_bpp_x16);
remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state,
true, dsc_slice_count, link_bpp_x16);
intel_dp_mst_compute_m_n(crtc_state,
local_bw_overhead,
link_bpp_x16,
&crtc_state->dp_m_n);
if (intel_dp->is_mst) {
int remote_bw_overhead;
int remote_tu;
fixed20_12 pbn;
remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state,
true, dsc_slice_count, link_bpp_x16);
/*
* The TU size programmed to the HW determines which slots in
* an MTP frame are used for this stream, which needs to match
@ -320,6 +322,17 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
connector->port,
dfixed_trunc(pbn));
} else {
/* Same as above for remote_tu */
crtc_state->dp_m_n.tu = ALIGN(crtc_state->dp_m_n.tu,
4 / crtc_state->lane_count);
if (crtc_state->dp_m_n.tu <= 64)
slots = crtc_state->dp_m_n.tu;
else
slots = -EINVAL;
}
if (slots == -EDEADLK)
return slots;