Revert "drm/amd/display: Disable DWB frame capture to emulate oneshot"

This reverts commit 77a66faa.

[WHY & HOW]
The writeback series cause a regression in thunderbolt display.
Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -592,20 +592,8 @@ static void dm_crtc_high_irq(void *interrupt_params)
 						       list_entry);
 			spin_unlock_irqrestore(&acrtc->wb_conn->job_lock, flags);
 
-			if (job) {
-				unsigned int v_total, refresh_hz;
-				struct dc_stream_state *stream = acrtc->dm_irq_params.stream;
-
-				v_total = stream->adjust.v_total_max ?
-					  stream->adjust.v_total_max : stream->timing.v_total;
-				refresh_hz = div_u64((uint64_t) stream->timing.pix_clk_100hz *
-					     100LL, (v_total * stream->timing.h_total));
-				mdelay(1000 / refresh_hz);
-
+			if (job)
 				drm_writeback_signal_completion(acrtc->wb_conn, 0);
-				dc_stream_fc_disable_writeback(adev->dm.dc,
-							       acrtc->dm_irq_params.stream, 0);
-			}
 		} else
 			DRM_ERROR("%s: no amdgpu_crtc wb_conn\n", __func__);
 		acrtc->wb_pending = false;

drivers/gpu/drm/amd/display/dc/core/dc_stream.c

@@ -489,33 +489,6 @@ bool dc_stream_add_writeback(struct dc *dc,
 	return true;
 }
 
-bool dc_stream_fc_disable_writeback(struct dc *dc,
-		struct dc_stream_state *stream,
-		uint32_t dwb_pipe_inst)
-{
-	struct dwbc *dwb = dc->res_pool->dwbc[dwb_pipe_inst];
-
-	if (stream == NULL) {
-		dm_error("DC: dc_stream is NULL!\n");
-		return false;
-	}
-
-	if (dwb_pipe_inst >= MAX_DWB_PIPES) {
-		dm_error("DC: writeback pipe is invalid!\n");
-		return false;
-	}
-
-	if (stream->num_wb_info > MAX_DWB_PIPES) {
-		dm_error("DC: num_wb_info is invalid!\n");
-		return false;
-	}
-
-	if (dwb->funcs->set_fc_enable)
-		dwb->funcs->set_fc_enable(dwb, DWB_FRAME_CAPTURE_DISABLE);
-
-	return true;
-}
-
 bool dc_stream_remove_writeback(struct dc *dc,
 		struct dc_stream_state *stream,
 		uint32_t dwb_pipe_inst)

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -454,10 +454,6 @@ bool dc_stream_add_writeback(struct dc *dc,
 		struct dc_stream_state *stream,
 		struct dc_writeback_info *wb_info);
 
-bool dc_stream_fc_disable_writeback(struct dc *dc,
-		struct dc_stream_state *stream,
-		uint32_t dwb_pipe_inst);
-
 bool dc_stream_remove_writeback(struct dc *dc,
 		struct dc_stream_state *stream,
 		uint32_t dwb_pipe_inst);