drm/i915: Bpp/timeslot calculation fixes for DP MST DSC

Fix intel_dp_dsc_compute_config, previously timeslots parameter
was used in fact not as a timeslots, but more like a ratio
timeslots/64, which of course didn't have any effect for SST DSC,
but causes now issues for MST DSC.
Secondly we need to calculate pipe_bpp using intel_dp_dsc_compute_bpp
only for SST DSC case, while for MST case it has been calculated
earlier already with intel_dp_dsc_mst_compute_link_config.
Third we also were wrongly determining sink min bpp/max bpp, those
limites should be intersected with our limits to find common
acceptable bpp's, plus on top of that we should align those with
VESA bpps and only then calculate required timeslots amount.
Some MST hubs started to work only after third change was made.

v2: Make kernel test robot happy(claimed there was unitialzed use,
    while there is none)
v3: Rename intel_dp_dsc_nearest_vesa_bpp to intel_dp_dsc_nearest_valid_bpp
    (Manasi Navare)

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/20221123100718.29130-1-stanislav.lisovskiy@intel.com

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index e4faccf87370..ef39e4f7a329 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -60,7 +60,8 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 				struct intel_crtc_state *pipe_config,
 				struct drm_connector_state *conn_state,
 				struct link_config_limits *limits,
-				int timeslots);
+				int timeslots,
+				bool recompute_pipe_bpp);
 bool intel_dp_is_edp(struct intel_dp *intel_dp);
 bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state);
 bool intel_dp_is_port_edp(struct drm_i915_private *dev_priv, enum port port);