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From: Bindu Ramamurthy <bindu.r@amd.com>
To: <amd-gfx@lists.freedesktop.org>
Cc: Eryk.Brol@amd.com, Jake Wang <haonan.wang2@amd.com>,
	Sunpeng.Li@amd.com, Harry.Wentland@amd.com,
	Qingqing.Zhuo@amd.com, Rodrigo.Siqueira@amd.com,
	Aurabindo.Pillai@amd.com, Bhawanpreet.Lakha@amd.com,
	bindu.r@amd.com
Subject: [PATCH 13/14] drm/amd/display: always program DPPDTO unless not safe to lower
Date: Fri, 18 Dec 2020 17:29:03 -0500	[thread overview]
Message-ID: <20201218222904.393785-14-bindu.r@amd.com> (raw)
In-Reply-To: <20201218222904.393785-1-bindu.r@amd.com>

From: Jake Wang <haonan.wang2@amd.com>

[Why]
We defer clock updates to after pipes have been programmed. In
some instances we use DPPCLK that have been previously set to be
"unused". This results in a brief window of time where underflow
could occur.

[How]
During prepare bandwidth allow rn_update_clocks_update_dpp_dto
to check each instance and compare previous clock to new clock.
If new clock is higher than previous clock, program DPPDTO.

Signed-off-by: Jake Wang <haonan.wang2@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
---
 .../gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
index bad30217c7b4..01b1853b7750 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
@@ -227,12 +227,11 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
 					rn_vbios_smu_set_dppclk(clk_mgr, clk_mgr_base->clks.dppclk_khz);
 
 		// always update dtos unless clock is lowered and not safe to lower
-		if (new_clocks->dppclk_khz >= dc->current_state->bw_ctx.bw.dcn.clk.dppclk_khz)
-			rn_update_clocks_update_dpp_dto(
-					clk_mgr,
-					context,
-					clk_mgr_base->clks.actual_dppclk_khz,
-					safe_to_lower);
+		rn_update_clocks_update_dpp_dto(
+				clk_mgr,
+				context,
+				clk_mgr_base->clks.actual_dppclk_khz,
+				safe_to_lower);
 	}
 
 	if (update_dispclk &&
-- 
2.25.1

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  parent reply	other threads:[~2020-12-18 22:30 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18 22:28 [PATCH 00/14] DC Patches December 21, 2020 Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 01/14] drm/amd/display: handler not correctly checked at remove_irq_handler Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 02/14] drm/amd/display: Interfaces for hubp blank and soft reset Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 03/14] drm/amd/display: Modify the hdcp device count check condition Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 04/14] drm/amd/display: To modify the condition in indicating branch device Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 05/14] drm/amd/display: gradually ramp ABM intensity Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 06/14] drm/amd/display: change SMU repsonse timeout to 2s Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 07/14] drm/amd/display: Update RN/VGH active display count workaround Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 08/14] drm/amd/display: Remove unnecessary NULL check Bindu Ramamurthy
2020-12-18 22:28 ` [PATCH 09/14] drm/amd/display: Multi-display underflow observed Bindu Ramamurthy
2020-12-18 22:29 ` [PATCH 10/14] drm/amd/display: Acquire DSC during split stream for ODM only if top_pipe Bindu Ramamurthy
2020-12-18 22:29 ` [PATCH 11/14] drm/amd/display: updated wm table for Renoir Bindu Ramamurthy
2020-12-18 22:29 ` [PATCH 12/14] drm/amd/display: [FW Promotion] Release 0.0.47 Bindu Ramamurthy
2020-12-18 22:29 ` Bindu Ramamurthy [this message]
2020-12-18 22:29 ` [PATCH 14/14] drm/amd/display: add getter routine to retrieve mpcc mux Bindu Ramamurthy

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