drm/amd/display: blank dp stream before re-train the link

[Why]
When link loss happened, monitor can not light up if only re-train the
link.

[How]
Blank all the DP streams on this link before re-train the link, and then
unblank the stream

Signed-off-by: Xiaodong Yan <Xiaodong.Yan@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 5d2ae2f..a87302f 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -2902,6 +2902,12 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
                for (i = 0; i < MAX_PIPES; i++) {
                        pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link == link)
+                               link->dc->hwss.blank_stream(pipe_ctx);
+               }
+
+               for (i = 0; i < MAX_PIPES; i++) {
+                       pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
+                       if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link == link)
                                break;
                }
 
@@ -2918,6 +2924,12 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
                if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
                        dc_link_reallocate_mst_payload(link);
 
+               for (i = 0; i < MAX_PIPES; i++) {
+                       pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
+                       if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link == link)
+                               link->dc->hwss.unblank_stream(pipe_ctx, &previous_link_settings);
+               }
+
                status = false;
                if (out_link_loss)
                        *out_link_loss = true;