[PATCH 24/35] drm/amd/display: Disable Stutter for Stereo 3D

[Bhawanpreet Lakha]

From: Wesley Chalmers <Wesley.Chalmers at amd.com>

[WHY]
Bandwidth calculation formulas currently do not take Stereo 3D + Stutter
properly into account. Disable stutter feature when we detect a Stereo
3D mode as a temporary workaround.

Change-Id: Icad94f294c662740b988592c6ed0228705b02071
Signed-off-by: Wesley Chalmers <Wesley.Chalmers at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
Acked-by: Martin Leung <Martin.Leung at amd.com>
---
 .../drm/amd/display/dc/dcn10/dcn10_hubbub.c   | 19 ++++++++++--------
 .../drm/amd/display/dc/dcn10/dcn10_hubbub.h   |  2 +-
 .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 20 ++++++++++++++++++-
 3 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c
index 5a4614c371bc..e161ad836812 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c
@@ -88,11 +88,18 @@ void hubbub1_wm_read_state(struct hubbub *hubbub,
 	s->dram_clk_chanage = REG_READ(DCHUBBUB_ARB_ALLOW_DRAM_CLK_CHANGE_WATERMARK_D);
 }
 
-void hubbub1_disable_allow_self_refresh(struct hubbub *hubbub)
+void hubbub1_allow_self_refresh_control(struct hubbub *hubbub, bool allow)
 {
 	struct dcn10_hubbub *hubbub1 = TO_DCN10_HUBBUB(hubbub);
-	REG_UPDATE(DCHUBBUB_ARB_DRAM_STATE_CNTL,
-			DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE, 0);
+
+	/*
+	 * DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE = 1 means do not allow stutter
+	 * DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE = 0 means allow stutter
+	 */
+
+	REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL,
+			DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_VALUE, 0,
+			DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE, !allow);
 }
 
 bool hububu1_is_allow_self_refresh_enabled(struct hubbub *hubbub)
@@ -262,8 +269,6 @@ void hubbub1_program_watermarks(
 		bool safe_to_lower)
 {
 	struct dcn10_hubbub *hubbub1 = TO_DCN10_HUBBUB(hubbub);
-
-	uint32_t force_en = hubbub1->base.ctx->dc->debug.disable_stutter ? 1 : 0;
 	/*
 	 * Need to clamp to max of the register values (i.e. no wrap)
 	 * for dcn1, all wm registers are 21-bit wide
@@ -537,9 +542,7 @@ void hubbub1_program_watermarks(
 	REG_UPDATE(DCHUBBUB_ARB_DF_REQ_OUTSTAND,
 			DCHUBBUB_ARB_MIN_REQ_OUTSTAND, 68);
 
-	REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL,
-			DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_VALUE, 0,
-			DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE, force_en);
+	hubbub1_allow_self_refresh_control(hubbub, !hubbub->ctx->dc->debug.disable_stutter);
 
 #if 0
 	REG_UPDATE_2(DCHUBBUB_ARB_WATERMARK_CHANGE_CNTL,
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.h b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.h
index c681e1cc9290..9cd4a5194154 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.h
@@ -204,7 +204,7 @@ void hubbub1_program_watermarks(
 		unsigned int refclk_mhz,
 		bool safe_to_lower);
 
-void hubbub1_disable_allow_self_refresh(struct hubbub *hubbub);
+void hubbub1_allow_self_refresh_control(struct hubbub *hubbub, bool allow);
 
 bool hububu1_is_allow_self_refresh_enabled(struct hubbub *hubub);
 
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 9f23ea283838..7cead0398c15 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1011,7 +1011,7 @@ static void dcn10_init_hw(struct dc *dc)
 			 */
 			if (allow_self_fresh_force_enable == false &&
 					hububu1_is_allow_self_refresh_enabled(dc->res_pool->hubbub))
-				hubbub1_disable_allow_self_refresh(dc->res_pool->hubbub);
+				hubbub1_allow_self_refresh_control(dc->res_pool->hubbub, true);
 
 			disable_vga(dc->hwseq);
 		}
@@ -2384,6 +2384,22 @@ static void dcn10_apply_ctx_for_surface(
 		hubbub1_wm_change_req_wa(dc->res_pool->hubbub);
 }
 
+static void dcn10_stereo_hw_frame_pack_wa(struct dc *dc, struct dc_state *context)
+{
+	uint8_t i;
+
+	for (i = 0; i < context->stream_count; i++) {
+		if (context->streams[i]->timing.timing_3d_format
+				== TIMING_3D_FORMAT_HW_FRAME_PACKING) {
+			/*
+			 * Disable stutter
+			 */
+			hubbub1_allow_self_refresh_control(dc->res_pool->hubbub, false);
+			break;
+		}
+	}
+}
+
 static void dcn10_prepare_bandwidth(
 		struct dc *dc,
 		struct dc_state *context)
@@ -2405,6 +2421,7 @@ static void dcn10_prepare_bandwidth(
 			&context->bw.dcn.watermarks,
 			dc->res_pool->ref_clock_inKhz / 1000,
 			true);
+	dcn10_stereo_hw_frame_pack_wa(dc, context);
 
 	if (dc->debug.pplib_wm_report_mode == WM_REPORT_OVERRIDE)
 		dcn_bw_notify_pplib_of_wm_ranges(dc);
@@ -2434,6 +2451,7 @@ static void dcn10_optimize_bandwidth(
 			&context->bw.dcn.watermarks,
 			dc->res_pool->ref_clock_inKhz / 1000,
 			true);
+	dcn10_stereo_hw_frame_pack_wa(dc, context);
 
 	if (dc->debug.pplib_wm_report_mode == WM_REPORT_OVERRIDE)
 		dcn_bw_notify_pplib_of_wm_ranges(dc);
-- 
2.17.1