[PATCH 11/18] drm/amd/display: Add writeback enable/disable in dc

[Alex Hung]

[WHAT]
The enable and disable writeback calls need to be included in the
coressponding functions in dc_stream.

Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 .../gpu/drm/amd/display/dc/core/dc_stream.c   | 33 +++++++++++++++++++
 .../drm/amd/display/dc/dcn30/dcn30_hwseq.c    |  4 +++
 2 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c 
b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 01fe2d2fd241..0157d9e55ca0 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -516,6 +516,25 @@ bool dc_stream_add_writeback(struct dc *dc,
                struct dwbc *dwb = dc->res_pool->dwbc[wb_info->dwb_pipe_inst];
                dwb->otg_inst = stream_status->primary_otg_inst;
        }
+
+       if (!dc->hwss.update_bandwidth(dc, dc->current_state)) {
+               dm_error("DC: update_bandwidth failed!\n");
+               return false;
+       }
+
+       /* enable writeback */
+       if (dc->hwss.enable_writeback) {
+               struct dwbc *dwb = dc->res_pool->dwbc[wb_info->dwb_pipe_inst];
+
+               if (dwb->funcs->is_enabled(dwb)) {
+                       /* writeback pipe already enabled, only need to update 
*/
+                       dc->hwss.update_writeback(dc, wb_info, 
dc->current_state);
+               } else {
+                       /* Enable writeback pipe from scratch*/
+                       dc->hwss.enable_writeback(dc, wb_info, 
dc->current_state);
+               }
+       }
+
        return true;
 }
 
@@ -560,6 +579,20 @@ bool dc_stream_remove_writeback(struct dc *dc,
        }
        stream->num_wb_info = j;
 
+       /* recalculate and apply DML parameters */
+       if (!dc->hwss.update_bandwidth(dc, dc->current_state)) {
+               dm_error("DC: update_bandwidth failed!\n");
+               return false;
+       }
+
+       /* disable writeback */
+       if (dc->hwss.disable_writeback) {
+               struct dwbc *dwb = dc->res_pool->dwbc[dwb_pipe_inst];
+
+               if (dwb->funcs->is_enabled(dwb))
+                       dc->hwss.disable_writeback(dc, dwb_pipe_inst);
+       }
+
        return true;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c 
b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index 6cef62d7a2e5..d97c7da33b6e 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -330,6 +330,10 @@ void dcn30_enable_writeback(
        DC_LOG_DWB("%s dwb_pipe_inst = %d, mpcc_inst = %d",\
                __func__, wb_info->dwb_pipe_inst,\
                wb_info->mpcc_inst);
+
+       /* Warmup interface */
+       dcn30_mmhubbub_warmup(dc, 1, wb_info);
+
        /* Update writeback pipe */
        dcn30_set_writeback(dc, wb_info, context);
 
-- 
2.41.0