[PATCH 36/47] drm/amd/display: Add writeback enable/disable in dc

[Rodrigo Siqueira]

From: Alex Hung <alex.hung at amd.com>

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

Reviewed-by: Harry Wentland <harry.wentland at amd.com>
Signed-off-by: Alex Hung <alex.hung at amd.com>
---
 .../gpu/drm/amd/display/dc/core/dc_stream.c   | 33 +++++++++++++++++++
 .../amd/display/dc/hwss/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 4bdf105d1d71..e71d622098d7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -467,6 +467,25 @@ 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;
 }
 
@@ -511,6 +530,20 @@ 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/hwss/dcn30/dcn30_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn30/dcn30_hwseq.c
index d71faf2ecd41..fd8a8c10a201 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn30/dcn30_hwseq.c
@@ -367,6 +367,10 @@ 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);
 
-- 
2.42.0