From: Fangzhi Zuo <jerry.zuo@xxxxxxx>
[WHY & HOW]
When dsc is possible, MST mode validation includes:
1. if maximum dsc compression cannot fit into end to end bw, mode pruned
2. if native bw cannot fit into end to end bw, try to enabled dsc to see
whether a feasible dsc config can be found
3. if native bw can fit into end to end bw, mode supported
Reviewed-by: Wayne Lin <wayne.lin@xxxxxxx>
Acked-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Fangzhi Zuo <jerry.zuo@xxxxxxx>
---
.../display/amdgpu_dm/amdgpu_dm_mst_types.c | 44 +++++++++++--------
1 file changed, 26 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index ec87e31c6fe8..8d7d4024f285 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -1602,9 +1602,8 @@ enum dc_status dm_dp_mst_is_port_support_mode(
struct dc_link_settings cur_link_settings;
unsigned int end_to_end_bw_in_kbps = 0;
unsigned int upper_link_bw_in_kbps = 0, down_link_bw_in_kbps = 0;
- unsigned int max_compressed_bw_in_kbps = 0;
struct dc_dsc_bw_range bw_range = {0};
- uint16_t full_pbn = aconnector->mst_output_port->full_pbn;
+ struct dc_dsc_config_options dsc_options = {0};
/*
* Consider the case with the depth of the mst topology tree is equal or less than 2
@@ -1620,30 +1619,39 @@ enum dc_status dm_dp_mst_is_port_support_mode(
(aconnector->mst_output_port->passthrough_aux ||
aconnector->dsc_aux == &aconnector->mst_output_port->aux)) {
cur_link_settings = stream->link->verified_link_cap;
+ upper_link_bw_in_kbps = dc_link_bandwidth_kbps(aconnector->dc_link, &cur_link_settings);
+ down_link_bw_in_kbps = kbps_from_pbn(aconnector->mst_output_port->full_pbn);
- upper_link_bw_in_kbps = dc_link_bandwidth_kbps(aconnector->dc_link,
- &cur_link_settings);
- down_link_bw_in_kbps = kbps_from_pbn(full_pbn);
-
- /* pick the bottleneck */
- end_to_end_bw_in_kbps = min(upper_link_bw_in_kbps,
- down_link_bw_in_kbps);
-
- /*
- * use the maximum dsc compression bandwidth as the required
- * bandwidth for the mode
- */
- max_compressed_bw_in_kbps = bw_range.min_kbps;
+ /* pick the end to end bw bottleneck */
+ end_to_end_bw_in_kbps = min(upper_link_bw_in_kbps, down_link_bw_in_kbps);
- if (end_to_end_bw_in_kbps < max_compressed_bw_in_kbps) {
- DRM_DEBUG_DRIVER("Mode does not fit into DSC pass-through bandwidth validation\n");
+ if (end_to_end_bw_in_kbps < bw_range.min_kbps) {
+ DRM_DEBUG_DRIVER("maximum dsc compression cannot fit into end-to-end bandwidth\n");
return DC_FAIL_BANDWIDTH_VALIDATE;
}
+
+ if (end_to_end_bw_in_kbps < bw_range.stream_kbps) {
+ dc_dsc_get_default_config_option(stream->link->dc, &dsc_options);
+ dsc_options.max_target_bpp_limit_override_x16 = aconnector->base.display_info.max_dsc_bpp * 16;
+ if (dc_dsc_compute_config(stream->sink->ctx->dc->res_pool->dscs[0],
+ &stream->sink->dsc_caps.dsc_dec_caps,
+ &dsc_options,
+ end_to_end_bw_in_kbps,
+ &stream->timing,
+ dc_link_get_highest_encoding_format(stream->link),
+ &stream->timing.dsc_cfg)) {
+ stream->timing.flags.DSC = 1;
+ DRM_DEBUG_DRIVER("end-to-end bandwidth require dsc and dsc config found\n");
+ } else {
+ DRM_DEBUG_DRIVER("end-to-end bandwidth require dsc but dsc config not found\n");
+ return DC_FAIL_BANDWIDTH_VALIDATE;
+ }
+ }
} else {
/* check if mode could be supported within full_pbn */
bpp = convert_dc_color_depth_into_bpc(stream->timing.display_color_depth) * 3;
pbn = drm_dp_calc_pbn_mode(stream->timing.pix_clk_100hz / 10, bpp, false);
- if (pbn > full_pbn)
+ if (pbn > aconnector->mst_output_port->full_pbn)
return DC_FAIL_BANDWIDTH_VALIDATE;
}
--
2.42.0
