Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/i915/dp: Account with DSC BW overhead for compressed DP-SST stream BW
A DSC compressed stream requires FEC (except for eDP), which has a BW
overhead on non-UHBR links that must be accounted for explicitly. Do
that during computing the required BW.
Note that the overhead doesn't need to be accounted for on UHBR links
where FEC is always enabled and so the corresponding overhead is part of
the channel coding efficiency instead (i.e. the overhead is part of the
available vs. the required BW).
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251215192357.172201-12-imre.deak@intel.com
+5
-1
+5
-1
drivers/gpu/drm/i915/display/intel_dp.c
+5
-1
drivers/gpu/drm/i915/display/intel_dp.c
···
2086
2086
if (ret)
2087
2087
continue;
2088
2088
} else {
2089
+
unsigned long bw_overhead_flags =
2090
+
pipe_config->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
2091
+
2089
2092
if (!is_bw_sufficient_for_dsc_config(intel_dp,
2090
2093
link_rate, lane_count,
2091
2094
adjusted_mode->crtc_clock,
2092
2095
adjusted_mode->hdisplay,
2093
2096
pipe_config->dsc.slice_count,
2094
-
dsc_bpp_x16, 0))
2097
+
dsc_bpp_x16,
2098
+
bw_overhead_flags))
2095
2099
continue;
2096
2100
}
2097
2101