[PATCH 05/35] drm/amd/display: Ungate stream before programming registers

[sunpeng.li at amd.com]

From: Gary Kattan <gary.kattan at amd.com>

[Why]
Certain tests fail after a fresh reboot. This is caused by writing to
registers prior to ungating the stream we're trying to program.

[How]
Make sure the stream is ungated before writing to its registers.
This also enables power-gating plane resources before init_hw
initializes them.
Additionally, this does some refactoring to move gating/ungating
from enable/disable_plane functions to where stream resources are
enabled/disabled.

Signed-off-by: Gary Kattan <gary.kattan at amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 6 ++++++
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c   | 8 ++++++--
 drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h           | 4 ++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 453ff07..42ee0a6 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1300,6 +1300,10 @@ static enum dc_status apply_single_controller_ctx_to_hw(
 	struct drr_params params = {0};
 	unsigned int event_triggers = 0;
 
+	if (dc->hwss.disable_stream_gating) {
+		dc->hwss.disable_stream_gating(dc, pipe_ctx);
+	}
+
 	if (pipe_ctx->stream_res.audio != NULL) {
 		struct audio_output audio_output;
 
@@ -2684,6 +2688,8 @@ static const struct hw_sequencer_funcs dce110_funcs = {
 	.set_static_screen_control = set_static_screen_control,
 	.reset_hw_ctx_wrap = dce110_reset_hw_ctx_wrap,
 	.enable_stream_timing = dce110_enable_stream_timing,
+	.disable_stream_gating = NULL,
+	.enable_stream_gating = NULL,
 	.setup_stereo = NULL,
 	.set_avmute = dce110_set_avmute,
 	.wait_for_mpcc_disconnect = dce110_wait_for_mpcc_disconnect,
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 d42fade..d4dde1d 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
@@ -1165,11 +1165,13 @@ static void reset_hw_ctx_wrap(
 			struct clock_source *old_clk = pipe_ctx_old->clock_source;
 
 			reset_back_end_for_pipe(dc, pipe_ctx_old, dc->current_state);
+			if (dc->hwss.enable_stream_gating) {
+				dc->hwss.enable_stream_gating(dc, pipe_ctx);
+			}
 			if (old_clk)
 				old_clk->funcs->cs_power_down(old_clk);
 		}
 	}
-
 }
 
 static bool patch_address_for_sbs_tb_stereo(
@@ -2786,7 +2788,9 @@ static const struct hw_sequencer_funcs dcn10_funcs = {
 	.edp_wait_for_hpd_ready = hwss_edp_wait_for_hpd_ready,
 	.set_cursor_position = dcn10_set_cursor_position,
 	.set_cursor_attribute = dcn10_set_cursor_attribute,
-	.set_cursor_sdr_white_level = dcn10_set_cursor_sdr_white_level
+	.set_cursor_sdr_white_level = dcn10_set_cursor_sdr_white_level,
+	.disable_stream_gating = NULL,
+	.enable_stream_gating = NULL
 };
 
 
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
index 341b481..fc03320 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
@@ -68,6 +68,10 @@ struct stream_resource;
 
 struct hw_sequencer_funcs {
 
+	void (*disable_stream_gating)(struct dc *dc, struct pipe_ctx *pipe_ctx);
+
+	void (*enable_stream_gating)(struct dc *dc, struct pipe_ctx *pipe_ctx);
+
 	void (*init_hw)(struct dc *dc);
 
 	void (*init_pipes)(struct dc *dc, struct dc_state *context);
-- 
2.7.4