releases/6.1.16/drm-amd-display-do-not-commit-pipe-when-updating-drr.patch

From be342b31d731ba3933ed164c772ba6b0022bc8a0 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 4 Nov 2022 15:19:22 -0400
Subject: drm/amd/display: Do not commit pipe when updating DRR

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

[ Upstream commit 8f0d304d21b351d65e8c434c5399a40231876ba1 ]

[WHY]
DRR and Pipe cannot be updated on
the same frame, or else underflow will
occur.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c          | 15 +++++++++++++++
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h |  3 ++-
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c |  9 +++++++++
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h |  2 ++
 .../drm/amd/display/dc/inc/hw/timing_generator.h  |  1 +
 5 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 24015f8cac75a..af7aefe285ffd 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3222,6 +3222,21 @@ static void commit_planes_for_stream(struct dc *dc,
 
 	dc_z10_restore(dc);
 
+	if (update_type == UPDATE_TYPE_FULL) {
+		/* wait for all double-buffer activity to clear on all pipes */
+		int pipe_idx;
+
+		for (pipe_idx = 0; pipe_idx < dc->res_pool->pipe_count; pipe_idx++) {
+			struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[pipe_idx];
+
+			if (!pipe_ctx->stream)
+				continue;
+
+			if (pipe_ctx->stream_res.tg->funcs->wait_drr_doublebuffer_pending_clear)
+				pipe_ctx->stream_res.tg->funcs->wait_drr_doublebuffer_pending_clear(pipe_ctx->stream_res.tg);
+		}
+	}
+
 	if (get_seamless_boot_stream_count(context) > 0 && surface_count > 0) {
 		/* Optimize seamless boot flag keeps clocks and watermarks high until
 		 * first flip. After first flip, optimization is required to lower
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
index 88ac5f6f4c96c..0b37bb0e184b2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
@@ -519,7 +519,8 @@ struct dcn_optc_registers {
 	type OTG_CRC_DATA_STREAM_COMBINE_MODE;\
 	type OTG_CRC_DATA_STREAM_SPLIT_MODE;\
 	type OTG_CRC_DATA_FORMAT;\
-	type OTG_V_TOTAL_LAST_USED_BY_DRR;
+	type OTG_V_TOTAL_LAST_USED_BY_DRR;\
+	type OTG_DRR_TIMING_DBUF_UPDATE_PENDING;
 
 #define TG_REG_FIELD_LIST_DCN3_2(type) \
 	type OTG_H_TIMING_DIV_MODE_MANUAL;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
index 892d3c4d01a1e..25749f7d88366 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
@@ -282,6 +282,14 @@ static void optc3_set_timing_double_buffer(struct timing_generator *optc, bool e
 		   OTG_DRR_TIMING_DBUF_UPDATE_MODE, mode);
 }
 
+void optc3_wait_drr_doublebuffer_pending_clear(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_WAIT(OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, 0, 2, 100000); /* 1 vupdate at 5hz */
+
+}
+
 void optc3_set_vtotal_min_max(struct timing_generator *optc, int vtotal_min, int vtotal_max)
 {
 	optc1_set_vtotal_min_max(optc, vtotal_min, vtotal_max);
@@ -351,6 +359,7 @@ static struct timing_generator_funcs dcn30_tg_funcs = {
 		.program_manual_trigger = optc2_program_manual_trigger,
 		.setup_manual_trigger = optc2_setup_manual_trigger,
 		.get_hw_timing = optc1_get_hw_timing,
+		.wait_drr_doublebuffer_pending_clear = optc3_wait_drr_doublebuffer_pending_clear,
 };
 
 void dcn30_timing_generator_init(struct optc *optc1)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
index dd45a5499b078..fb06dc9a48937 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
@@ -279,6 +279,7 @@
 	SF(OTG0_OTG_DRR_TRIGGER_WINDOW, OTG_DRR_TRIGGER_WINDOW_END_X, mask_sh),\
 	SF(OTG0_OTG_DRR_V_TOTAL_CHANGE, OTG_DRR_V_TOTAL_CHANGE_LIMIT, mask_sh),\
 	SF(OTG0_OTG_H_TIMING_CNTL, OTG_H_TIMING_DIV_BY2, mask_sh),\
+	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, mask_sh),\
 	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_MODE, mask_sh),\
 	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_BLANK_DATA_DOUBLE_BUFFER_EN, mask_sh)
 
@@ -317,6 +318,7 @@
 	SF(OTG0_OTG_DRR_TRIGGER_WINDOW, OTG_DRR_TRIGGER_WINDOW_END_X, mask_sh),\
 	SF(OTG0_OTG_DRR_V_TOTAL_CHANGE, OTG_DRR_V_TOTAL_CHANGE_LIMIT, mask_sh),\
 	SF(OTG0_OTG_H_TIMING_CNTL, OTG_H_TIMING_DIV_MODE, mask_sh),\
+	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, mask_sh),\
 	SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_MODE, mask_sh)
 
 void dcn30_timing_generator_init(struct optc *optc1);
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
index 25a1df45b2641..f96fb425345e4 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
@@ -325,6 +325,7 @@ struct timing_generator_funcs {
 			uint32_t vtotal_change_limit);
 
 	void (*init_odm)(struct timing_generator *tg);
+	void (*wait_drr_doublebuffer_pending_clear)(struct timing_generator *tg);
 };
 
 #endif
-- 
2.39.2