drm/amd/display: Remove min_dst_y_next_start check for Z8

commit 08448812acb2ab701cd5ff7e1a1dc97f7f10260c upstream.

[Why]
Flickering occurs on DRR supported panels when engaged in DRR due to
min_dst_y_next becoming larger than the frame size itself.

[How]
In general, we should be able to enter Z8 when this is engaged but it
might be a net power loss even if the calculation wasn't bugged.

Don't support enabling Z8 during the DRR region.

Cc: stable@vger.kernel.org # 6.1+
Reviewed-by: Syed Hassan <syed.hassan@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
index 5805fb0..f2de0c7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
@@ -948,10 +948,8 @@ static enum dcn_zstate_support_state  decide_zstate_support(struct dc *dc, struc
 {
        int plane_count;
        int i;
-       unsigned int min_dst_y_next_start_us;
 
        plane_count = 0;
-       min_dst_y_next_start_us = 0;
        for (i = 0; i < dc->res_pool->pipe_count; i++) {
                if (context->res_ctx.pipe_ctx[i].plane_state)
                        plane_count++;
@@ -973,26 +971,15 @@ static enum dcn_zstate_support_state  decide_zstate_support(struct dc *dc, struc
        else if (context->stream_count == 1 &&  context->streams[0]->signal == SIGNAL_TYPE_EDP) {
                struct dc_link *link = context->streams[0]->sink->link;
                struct dc_stream_status *stream_status = &context->stream_status[0];
-               struct dc_stream_state *current_stream = context->streams[0];
                int minmum_z8_residency = dc->debug.minimum_z8_residency_time > 0 ? dc->debug.minimum_z8_residency_time : 1000;
                bool allow_z8 = context->bw_ctx.dml.vba.StutterPeriod > (double)minmum_z8_residency;
                bool is_pwrseq0 = link->link_index == 0;
-               bool isFreesyncVideo;
-
-               isFreesyncVideo = current_stream->adjust.v_total_min == current_stream->adjust.v_total_max;
-               isFreesyncVideo = isFreesyncVideo && current_stream->timing.v_total < current_stream->adjust.v_total_min;
-               for (i = 0; i < dc->res_pool->pipe_count; i++) {
-                       if (context->res_ctx.pipe_ctx[i].stream == current_stream && isFreesyncVideo) {
-                               min_dst_y_next_start_us = context->res_ctx.pipe_ctx[i].dlg_regs.min_dst_y_next_start_us;
-                               break;
-                       }
-               }
 
                /* Don't support multi-plane configurations */
                if (stream_status->plane_count > 1)
                        return DCN_ZSTATE_SUPPORT_DISALLOW;
 
-               if (is_pwrseq0 && (context->bw_ctx.dml.vba.StutterPeriod > 5000.0 || min_dst_y_next_start_us > 5000))
+               if (is_pwrseq0 && context->bw_ctx.dml.vba.StutterPeriod > 5000.0)
                        return DCN_ZSTATE_SUPPORT_ALLOW;
                else if (is_pwrseq0 && link->psr_settings.psr_version == DC_PSR_VERSION_1 && !link->panel_config.psr.disable_psr)
                        return allow_z8 ? DCN_ZSTATE_SUPPORT_ALLOW_Z8_Z10_ONLY : DCN_ZSTATE_SUPPORT_ALLOW_Z10_ONLY;