linux-kernel - [PATCH AUTOSEL 6.7 19/88] drm/amd/display: Fix disable_otg

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Date: Mon, 22 Jan 2024 09:50:52 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Nicholas Susanto <nicholas.susanto@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
	Rodrigo Siqueira <rodrigo.siqueira@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	harry.wentland@....com,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	charlene.liu@....com,
	hamza.mahfooz@....com,
	sungkim@....com,
	yang.lee@...ux.alibaba.com,
	ovidiu.bunea@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.7 19/88] drm/amd/display: Fix disable_otg_wa logic

From: Nicholas Susanto <nicholas.susanto@....com>

[ Upstream commit 2ce156482a6fef349d2eba98e5070c412d3af662 ]

[Why]
When switching to another HDMI mode, we are unnecesarilly
disabling/enabling FIFO causing both HPO and DIG registers to be set at
the same time when only HPO is supposed to be set.

This can lead to a system hang the next time we change refresh rates as
there are cases when we don't disable OTG/FIFO but FIFO is enabled when
it isn't supposed to be.

[How]
Removing the enable/disable FIFO entirely.

Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@....com>
Signed-off-by: Nicholas Susanto <nicholas.susanto@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c  | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c
index d5fde7d23fbf..f3b0af2c0295 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c
@@ -126,21 +126,13 @@ static void dcn35_disable_otg_wa(struct clk_mgr *clk_mgr_base, struct dc_state *
 			continue;
 		if (pipe->stream && (pipe->stream->dpms_off || dc_is_virtual_signal(pipe->stream->signal) ||
 				     !pipe->stream->link_enc)) {
-			struct stream_encoder *stream_enc = pipe->stream_res.stream_enc;
-
 			if (disable) {
-				if (stream_enc && stream_enc->funcs->disable_fifo)
-					pipe->stream_res.stream_enc->funcs->disable_fifo(stream_enc);
-
 				if (pipe->stream_res.tg && pipe->stream_res.tg->funcs->immediate_disable_crtc)
 					pipe->stream_res.tg->funcs->immediate_disable_crtc(pipe->stream_res.tg);
 
 				reset_sync_context_for_pipe(dc, context, i);
 			} else {
 				pipe->stream_res.tg->funcs->enable_crtc(pipe->stream_res.tg);
-
-				if (stream_enc && stream_enc->funcs->enable_fifo)
-					pipe->stream_res.stream_enc->funcs->enable_fifo(stream_enc);
 			}
 		}
 	}
-- 
2.43.0