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 2e74ccf7df5bff4a8b36397adac4aa8f077622bc..ce6929224a6ed928e02426bb0da92cef12f8ed63 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 @@ -36,6 +36,7 @@ #include "dm_helpers.h" #include "dc_link_ddc.h" +#include "dc_link_dp.h" #include "ddc_service_types.h" #include "dpcd_defs.h" @@ -1386,19 +1387,90 @@ bool pre_validate_dsc(struct drm_atomic_state *state, return (ret == 0); } -#endif +static unsigned int kbps_from_pbn(unsigned int pbn) +{ + unsigned int kbps = pbn; + + kbps *= (1000000 / PEAK_FACTOR_X1000); + kbps *= 8; + kbps *= 54; + kbps /= 64; + + return kbps; +} + +static bool is_dsc_common_config_possible(struct dc_stream_state *stream, + struct dc_dsc_bw_range *bw_range) +{ + struct dc_dsc_policy dsc_policy = {0}; + + dc_dsc_get_policy_for_timing(&stream->timing, 0, &dsc_policy); + dc_dsc_compute_bandwidth_range(stream->sink->ctx->dc->res_pool->dscs[0], + stream->sink->ctx->dc->debug.dsc_min_slice_height_override, + dsc_policy.min_target_bpp * 16, + dsc_policy.max_target_bpp * 16, + &stream->sink->dsc_caps.dsc_dec_caps, + &stream->timing, bw_range); + + return bw_range->max_target_bpp_x16 && bw_range->min_target_bpp_x16; +} +#endif /* CONFIG_DRM_AMD_DC_DCN */ enum dc_status dm_dp_mst_is_port_support_mode( struct amdgpu_dm_connector *aconnector, struct dc_stream_state *stream) { int bpp, pbn, branch_max_throughput_mps = 0; +#if defined(CONFIG_DRM_AMD_DC_DCN) + 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}; - /* 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 > aconnector->port->full_pbn) - return DC_FAIL_BANDWIDTH_VALIDATE; + /* + * check if the mode could be supported if DSC pass-through is supported + * AND check if there enough bandwidth available to support the mode + * with DSC enabled. + */ + if (is_dsc_common_config_possible(stream, &bw_range) && + aconnector->port->passthrough_aux) { + mutex_lock(&aconnector->mst_mgr.lock); + + 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->port->full_pbn); + + /* pick the bottleneck */ + end_to_end_bw_in_kbps = min(upper_link_bw_in_kbps, + down_link_bw_in_kbps); + + mutex_unlock(&aconnector->mst_mgr.lock); + + /* + * use the maximum dsc compression bandwidth as the required + * bandwidth for the mode + */ + max_compressed_bw_in_kbps = bw_range.min_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"); + return DC_FAIL_BANDWIDTH_VALIDATE; + } + } else { +#endif + /* 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 > aconnector->port->full_pbn) + return DC_FAIL_BANDWIDTH_VALIDATE; +#if defined(CONFIG_DRM_AMD_DC_DCN) + } +#endif /* check is mst dsc output bandwidth branch_overall_throughput_0_mps */ switch (stream->timing.pixel_encoding) {