drm/amd/display: Multi display synchronization logic

This feature synchronizes multiple displays with various timings
to a display with the highest refresh rate
it is enabled if edid caps flag multi_display_sync is set to one

There are limitations on refresh rates allowed
that can be synchronized. That would
prevent from underflow and other potential
corruptions.

Multi display synchronization is using the
same functions as timing_sync in order to minimize
redunduncy and decision to disable synchronization is
based on trigger parametre set in DM

Feature is developed for DCN1 and DCE11

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Mikita Lipski <Mikita.Lipski@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 219 insertions, 46 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
index 4befce6cd87a..25ca72139e5f 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
@@ -1224,26 +1224,46 @@ void dce110_timing_generator_setup_global_swap_lock(
 
 	/* This pipe will belong to GSL Group zero. */
 	set_reg_field_value(value,
-			1,
-			DCP_GSL_CONTROL,
-			DCP_GSL0_EN);
+			    1,
+			    DCP_GSL_CONTROL,
+			    DCP_GSL0_EN);
 
 	set_reg_field_value(value,
-			gsl_params->gsl_master == tg->inst,
-			DCP_GSL_CONTROL,
-			DCP_GSL_MASTER_EN);
+			    gsl_params->gsl_master == tg->inst,
+			    DCP_GSL_CONTROL,
+			    DCP_GSL_MASTER_EN);
 
 	set_reg_field_value(value,
-			HFLIP_READY_DELAY,
-			DCP_GSL_CONTROL,
-			DCP_GSL_HSYNC_FLIP_FORCE_DELAY);
+			    HFLIP_READY_DELAY,
+			    DCP_GSL_CONTROL,
+			    DCP_GSL_HSYNC_FLIP_FORCE_DELAY);
 
 	/* Keep signal low (pending high) during 6 lines.
 	 * Also defines minimum interval before re-checking signal. */
 	set_reg_field_value(value,
-			HFLIP_CHECK_DELAY,
-			DCP_GSL_CONTROL,
-			DCP_GSL_HSYNC_FLIP_CHECK_DELAY);
+			    HFLIP_CHECK_DELAY,
+			    DCP_GSL_CONTROL,
+			    DCP_GSL_HSYNC_FLIP_CHECK_DELAY);
+
+	dm_write_reg(tg->ctx, CRTC_REG(mmDCP_GSL_CONTROL), value);
+	value = 0;
+
+	set_reg_field_value(value,
+			    gsl_params->gsl_master,
+			    DCIO_GSL0_CNTL,
+			    DCIO_GSL0_VSYNC_SEL);
+
+	set_reg_field_value(value,
+			    0,
+			    DCIO_GSL0_CNTL,
+			    DCIO_GSL0_TIMING_SYNC_SEL);
+
+	set_reg_field_value(value,
+			    0,
+			    DCIO_GSL0_CNTL,
+			    DCIO_GSL0_GLOBAL_UNLOCK_SEL);
+
+	dm_write_reg(tg->ctx, CRTC_REG(mmDCIO_GSL0_CNTL), value);
 
 
 	{
@@ -1253,38 +1273,38 @@ void dce110_timing_generator_setup_global_swap_lock(
 				CRTC_REG(mmCRTC_V_TOTAL));
 
 		set_reg_field_value(value,
-				0,/* DCP_GSL_PURPOSE_SURFACE_FLIP */
-				DCP_GSL_CONTROL,
-				DCP_GSL_SYNC_SOURCE);
+				    0,/* DCP_GSL_PURPOSE_SURFACE_FLIP */
+				    DCP_GSL_CONTROL,
+				    DCP_GSL_SYNC_SOURCE);
 
 		/* Checkpoint relative to end of frame */
 		check_point = get_reg_field_value(value_crtc_vtotal,
-				CRTC_V_TOTAL,
-				CRTC_V_TOTAL);
+						  CRTC_V_TOTAL,
+						  CRTC_V_TOTAL);
 
 		dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_GSL_WINDOW), 0);
 	}
 
 	set_reg_field_value(value,
-			1,
-			DCP_GSL_CONTROL,
-			DCP_GSL_DELAY_SURFACE_UPDATE_PENDING);
+			    1,
+			    DCP_GSL_CONTROL,
+			    DCP_GSL_DELAY_SURFACE_UPDATE_PENDING);
 
 	dm_write_reg(tg->ctx, address, value);
 
 	/********************************************************************/
 	address = CRTC_REG(mmCRTC_GSL_CONTROL);
 
-	value = 0;
+	value = dm_read_reg(tg->ctx, address);
 	set_reg_field_value(value,
-			check_point - FLIP_READY_BACK_LOOKUP,
-			CRTC_GSL_CONTROL,
-			CRTC_GSL_CHECK_LINE_NUM);
+			    check_point - FLIP_READY_BACK_LOOKUP,
+			    CRTC_GSL_CONTROL,
+			    CRTC_GSL_CHECK_LINE_NUM);
 
 	set_reg_field_value(value,
-			VFLIP_READY_DELAY,
-			CRTC_GSL_CONTROL,
-			CRTC_GSL_FORCE_DELAY);
+			    VFLIP_READY_DELAY,
+			    CRTC_GSL_CONTROL,
+			    CRTC_GSL_FORCE_DELAY);
 
 	dm_write_reg(tg->ctx, address, value);
 }
@@ -1555,6 +1575,138 @@ void dce110_timing_generator_enable_reset_trigger(
 	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL), value);
 }
 
+void dce110_timing_generator_enable_crtc_reset(
+		struct timing_generator *tg,
+		int source_tg_inst,
+		struct crtc_trigger_info *crtc_tp)
+{
+	uint32_t value = 0;
+	uint32_t rising_edge = 0;
+	uint32_t falling_edge = 0;
+	struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
+
+	/* Setup trigger edge */
+	switch (crtc_tp->event) {
+	case CRTC_EVENT_VSYNC_RISING:
+			rising_edge = 1;
+			break;
+
+	case CRTC_EVENT_VSYNC_FALLING:
+		falling_edge = 1;
+		break;
+	}
+
+	value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_TRIGB_CNTL));
+
+	set_reg_field_value(value,
+			    source_tg_inst,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_SOURCE_SELECT);
+
+	set_reg_field_value(value,
+			    TRIGGER_POLARITY_SELECT_LOGIC_ZERO,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_POLARITY_SELECT);
+
+	set_reg_field_value(value,
+			    rising_edge,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_RISING_EDGE_DETECT_CNTL);
+
+	set_reg_field_value(value,
+			    falling_edge,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_FALLING_EDGE_DETECT_CNTL);
+
+	set_reg_field_value(value,
+			    1, /* clear trigger status */
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_CLEAR);
+
+	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_TRIGB_CNTL), value);
+
+	/**************************************************************/
+
+	switch (crtc_tp->delay) {
+	case TRIGGER_DELAY_NEXT_LINE:
+		value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL));
+
+		set_reg_field_value(value,
+				    0, /* force H count to H_TOTAL and V count to V_TOTAL */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_MODE);
+
+		set_reg_field_value(value,
+				    0, /* TriggerB - we never use TriggerA */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_TRIG_SEL);
+
+		set_reg_field_value(value,
+				    1, /* clear trigger status */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_CLEAR);
+
+		dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL), value);
+
+		value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_VERT_SYNC_CONTROL));
+
+		set_reg_field_value(value,
+				    1,
+				    CRTC_VERT_SYNC_CONTROL,
+				    CRTC_FORCE_VSYNC_NEXT_LINE_CLEAR);
+
+		set_reg_field_value(value,
+				    2,
+				    CRTC_VERT_SYNC_CONTROL,
+				    CRTC_AUTO_FORCE_VSYNC_MODE);
+
+		break;
+
+	case TRIGGER_DELAY_NEXT_PIXEL:
+		value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_VERT_SYNC_CONTROL));
+
+		set_reg_field_value(value,
+				    1,
+				    CRTC_VERT_SYNC_CONTROL,
+				    CRTC_FORCE_VSYNC_NEXT_LINE_CLEAR);
+
+		set_reg_field_value(value,
+				    0,
+				    CRTC_VERT_SYNC_CONTROL,
+				    CRTC_AUTO_FORCE_VSYNC_MODE);
+
+		dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_VERT_SYNC_CONTROL), value);
+
+		value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL));
+
+		set_reg_field_value(value,
+				    2, /* force H count to H_TOTAL and V count to V_TOTAL */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_MODE);
+
+		set_reg_field_value(value,
+				    1, /* TriggerB - we never use TriggerA */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_TRIG_SEL);
+
+		set_reg_field_value(value,
+				    1, /* clear trigger status */
+				    CRTC_FORCE_COUNT_NOW_CNTL,
+				    CRTC_FORCE_COUNT_NOW_CLEAR);
+
+		dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL), value);
+		break;
+	}
+
+	value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_MASTER_UPDATE_MODE));
+
+	set_reg_field_value(value,
+			    2,
+			    CRTC_MASTER_UPDATE_MODE,
+			    MASTER_UPDATE_MODE);
+
+	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_MASTER_UPDATE_MODE), value);
+}
 void dce110_timing_generator_disable_reset_trigger(
 	struct timing_generator *tg)
 {
@@ -1564,34 +1716,48 @@ void dce110_timing_generator_disable_reset_trigger(
 	value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL));
 
 	set_reg_field_value(value,
-			0, /* force counter now mode is disabled */
-			CRTC_FORCE_COUNT_NOW_CNTL,
-			CRTC_FORCE_COUNT_NOW_MODE);
+			    0, /* force counter now mode is disabled */
+			    CRTC_FORCE_COUNT_NOW_CNTL,
+			    CRTC_FORCE_COUNT_NOW_MODE);
 
 	set_reg_field_value(value,
-			1, /* clear trigger status */
-			CRTC_FORCE_COUNT_NOW_CNTL,
-			CRTC_FORCE_COUNT_NOW_CLEAR);
+			    1, /* clear trigger status */
+			    CRTC_FORCE_COUNT_NOW_CNTL,
+			    CRTC_FORCE_COUNT_NOW_CLEAR);
 
 	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL), value);
 
+	value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_VERT_SYNC_CONTROL));
+
+	set_reg_field_value(value,
+			    1,
+			    CRTC_VERT_SYNC_CONTROL,
+			    CRTC_FORCE_VSYNC_NEXT_LINE_CLEAR);
+
+	set_reg_field_value(value,
+			    0,
+			    CRTC_VERT_SYNC_CONTROL,
+			    CRTC_AUTO_FORCE_VSYNC_MODE);
+
+	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_VERT_SYNC_CONTROL), value);
+
 	/********************************************************************/
 	value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_TRIGB_CNTL));
 
 	set_reg_field_value(value,
-			TRIGGER_SOURCE_SELECT_LOGIC_ZERO,
-			CRTC_TRIGB_CNTL,
-			CRTC_TRIGB_SOURCE_SELECT);
+			    TRIGGER_SOURCE_SELECT_LOGIC_ZERO,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_SOURCE_SELECT);
 
 	set_reg_field_value(value,
-			TRIGGER_POLARITY_SELECT_LOGIC_ZERO,
-			CRTC_TRIGB_CNTL,
-			CRTC_TRIGB_POLARITY_SELECT);
+			    TRIGGER_POLARITY_SELECT_LOGIC_ZERO,
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_POLARITY_SELECT);
 
 	set_reg_field_value(value,
-			1, /* clear trigger status */
-			CRTC_TRIGB_CNTL,
-			CRTC_TRIGB_CLEAR);
+			    1, /* clear trigger status */
+			    CRTC_TRIGB_CNTL,
+			    CRTC_TRIGB_CLEAR);
 
 	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_TRIGB_CNTL), value);
 }
@@ -1611,10 +1777,16 @@ bool dce110_timing_generator_did_triggered_reset_occur(
 	struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
 	uint32_t value = dm_read_reg(tg->ctx,
 			CRTC_REG(mmCRTC_FORCE_COUNT_NOW_CNTL));
-
-	return get_reg_field_value(value,
-			CRTC_FORCE_COUNT_NOW_CNTL,
-			CRTC_FORCE_COUNT_NOW_OCCURRED) != 0;
+	uint32_t value1 = dm_read_reg(tg->ctx,
+			CRTC_REG(mmCRTC_VERT_SYNC_CONTROL));
+	bool force = get_reg_field_value(value,
+					 CRTC_FORCE_COUNT_NOW_CNTL,
+					 CRTC_FORCE_COUNT_NOW_OCCURRED) != 0;
+	bool vert_sync = get_reg_field_value(value1,
+					     CRTC_VERT_SYNC_CONTROL,
+					     CRTC_FORCE_VSYNC_NEXT_LINE_OCCURRED) != 0;
+
+	return (force || vert_sync);
 }
 
 /**
@@ -1928,6 +2100,7 @@ static const struct timing_generator_funcs dce110_tg_funcs = {
 		.setup_global_swap_lock =
 				dce110_timing_generator_setup_global_swap_lock,
 		.enable_reset_trigger = dce110_timing_generator_enable_reset_trigger,
+		.enable_crtc_reset = dce110_timing_generator_enable_crtc_reset,
 		.disable_reset_trigger = dce110_timing_generator_disable_reset_trigger,
 		.tear_down_global_swap_lock =
 				dce110_timing_generator_tear_down_global_swap_lock,