drm/i915: Fix timeslots argument for DP DSC SST case

We now accept timeslots param exactly how the variable
sounds: amount of timeslots, but not ratio timeslots/64.
So for SST case(when we have all timeslots for use), it
should be 64, but not 1.
This caused some issues in the tests.

v2: Fixed comments

References: https://gitlab.freedesktop.org/drm/intel/-/issues/6860
Fixes: 52f14682ac4d ("drm/i915: Bpp/timeslot calculation fixes for DP MST DSC")
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230109140210.25822-1-stanislav.lisovskiy@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index bf80f29..30c55f9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -713,9 +713,9 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
 
        /*
         * Available Link Bandwidth(Kbits/sec) = (NumberOfLanes)*
-        * (LinkSymbolClock)* 8 * (TimeSlotsPerMTP)
-        * for SST -> TimeSlotsPerMTP is 1,
-        * for MST -> TimeSlotsPerMTP has to be calculated
+        * (LinkSymbolClock)* 8 * (TimeSlots / 64)
+        * for SST -> TimeSlots is 64(i.e all TimeSlots that are available)
+        * for MST -> TimeSlots has to be calculated, based on mode requirements
         */
        bits_per_pixel = DIV_ROUND_UP((link_clock * lane_count) * timeslots,
                                      intel_dp_mode_to_fec_clock(mode_clock) * 8);
@@ -1685,7 +1685,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
                            str_yes_no(ret), str_yes_no(joiner_needs_dsc),
                            str_yes_no(intel_dp->force_dsc_en));
                ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
-                                                 conn_state, &limits, 1, true);
+                                                 conn_state, &limits, 64, true);
                if (ret < 0)
                        return ret;
        }