mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-13 18:49:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915/dp: Add support for DP UHBR SST DSC

Browse Source 
Drop the UHBR limitation from DP SST DSC, and handle SST DSC bandwidth
computation for UHBR using intel_dp_mtp_tu_compute_config().

Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250203160834.2708027-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Jani Nikula
2025-02-03 18:08:34 +02:00
parent a40e718d34
commit ebac36ea8a
1 changed files with 27 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/i915/display/intel_dp.c
View File

@@ -1958,15 +1958,37 @@ static int dsc_compute_link_config(struct intel_dp *intel_dp,
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
lane_count <<= 1) {
if (!is_bw_sufficient_for_dsc_config(dsc_bpp_x16, link_rate,
lane_count, adjusted_mode->clock,
pipe_config->output_format,
timeslots))
continue;
/*
* FIXME: intel_dp_mtp_tu_compute_config() requires
* ->lane_count and ->port_clock set before we know
* they'll work. If we end up failing altogether,
* they'll remain in crtc state. This shouldn't matter,
* as we'd then bail out from compute config, but it's
* just ugly.
*/
pipe_config->lane_count = lane_count;
pipe_config->port_clock = link_rate;
if (drm_dp_is_uhbr_rate(link_rate)) {
int ret;
ret = intel_dp_mtp_tu_compute_config(intel_dp,
pipe_config,
conn_state,
dsc_bpp_x16,
dsc_bpp_x16,
0, true);
if (ret)
continue;
} else {
if (!is_bw_sufficient_for_dsc_config(dsc_bpp_x16, link_rate,
lane_count, adjusted_mode->clock,
pipe_config->output_format,
timeslots))
continue;
}
return 0;
}
}
@@ -2493,9 +2515,6 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
limits->min_rate = intel_dp_min_link_rate(intel_dp);
limits->max_rate = intel_dp_max_link_rate(intel_dp);
/* FIXME 128b/132b SST+DSC support missing */
if (!is_mst && dsc)
limits->max_rate = min(limits->max_rate, 810000);
limits->min_rate = min(limits->min_rate, limits->max_rate);
limits->min_lane_count = intel_dp_min_lane_count(intel_dp);