Revert "drm/amd/display: Add new set_fc_enable to struct dwbc_funcs"

This reverts commit b79a00a4.

[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/dc/dcn30/dcn30_dwb.c

@@ -130,28 +130,6 @@ bool dwb3_disable(struct dwbc *dwbc)
 	return true;
 }
 
-void dwb3_set_fc_enable(struct dwbc *dwbc, enum dwb_frame_capture_enable enable)
-{
-	struct dcn30_dwbc *dwbc30 = TO_DCN30_DWBC(dwbc);
-	unsigned int pre_locked;
-
-	REG_GET(DWB_UPDATE_CTRL, DWB_UPDATE_LOCK, &pre_locked);
-
-	/* Lock DWB registers */
-	if (pre_locked == 0)
-		REG_UPDATE(DWB_UPDATE_CTRL, DWB_UPDATE_LOCK, 1);
-
-	/* Disable FC */
-	REG_UPDATE(FC_MODE_CTRL, FC_FRAME_CAPTURE_EN, enable);
-
-	/* Unlock DWB registers */
-	if (pre_locked == 0)
-		REG_UPDATE(DWB_UPDATE_CTRL, DWB_UPDATE_LOCK, 0);
-
-	DC_LOG_DWB("%s dwb3_fc_disabled at inst = %d", __func__, dwbc->inst);
-}
-
-
 bool dwb3_update(struct dwbc *dwbc, struct dc_dwb_params *params)
 {
 	struct dcn30_dwbc *dwbc30 = TO_DCN30_DWBC(dwbc);
@@ -248,7 +226,6 @@ static const struct dwbc_funcs dcn30_dwbc_funcs = {
 	.disable		= dwb3_disable,
 	.update			= dwb3_update,
 	.is_enabled		= dwb3_is_enabled,
-	.set_fc_enable		= dwb3_set_fc_enable,
 	.set_stereo		= dwb3_set_stereo,
 	.set_new_content	= dwb3_set_new_content,
 	.dwb_program_output_csc	= NULL,

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb.h

@@ -877,8 +877,6 @@ bool dwb3_update(struct dwbc *dwbc, struct dc_dwb_params *params);
 
 bool dwb3_is_enabled(struct dwbc *dwbc);
 
-void dwb3_set_fc_enable(struct dwbc *dwbc, enum dwb_frame_capture_enable enable);
-
 void dwb3_set_stereo(struct dwbc *dwbc,
 	struct dwb_stereo_params *stereo_params);
 

drivers/gpu/drm/amd/display/dc/inc/hw/dwb.h

@@ -188,10 +188,6 @@ struct dwbc_funcs {
 	bool (*is_enabled)(
 		struct dwbc *dwbc);
 
-	void (*set_fc_enable)(
-		struct dwbc *dwbc,
-		enum dwb_frame_capture_enable enable);
-
 	void (*set_stereo)(
 		struct dwbc *dwbc,
 		struct dwb_stereo_params *stereo_params);