linux-kernel - [PATCH AUTOSEL 5.10 19/25] drm/amd/display: Exit idle optimizations before attempt to access PHY

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Message-Id: <20230813160936.1082758-19-sashal@kernel.org>
Date:   Sun, 13 Aug 2023 12:09:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Leo Chen <sancchen@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Alex Hung <alex.hung@....com>,
        Daniel Wheeler <daniel.wheeler@....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, wenjing.liu@....com, Jun.Lei@....com,
        Charlene.Liu@....com, Alvin.Lee2@....com, zhikai.zhai@....com,
        aric.cyr@....com, Jingwen.Zhu@....com, Iswara.Nagulendran@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 19/25] drm/amd/display: Exit idle optimizations before attempt to access PHY

From: Leo Chen <sancchen@....com>

[ Upstream commit de612738e9771bd66aeb20044486c457c512f684 ]

[Why & How]
DMUB may hang when powering down pixel clocks due to no dprefclk.

It is fixed by exiting idle optimization before the attempt to access PHY.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Acked-by: Alex Hung <alex.hung@....com>
Signed-off-by: Leo Chen <sancchen@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 3 +++
 1 file changed, 3 insertions(+)

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 e33fe0207b9e5..53e8defd34751 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
@@ -1682,10 +1682,13 @@ void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context)
 			hws->funcs.edp_backlight_control(edp_link_with_sink, false);
 		}
 		/*resume from S3, no vbios posting, no need to power down again*/
+		clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr);
+
 		power_down_all_hw_blocks(dc);
 		disable_vga_and_power_gate_all_controllers(dc);
 		if (edp_link_with_sink && !keep_edp_vdd_on)
 			dc->hwss.edp_power_control(edp_link_with_sink, false);
+		clk_mgr_optimize_pwr_state(dc, dc->clk_mgr);
 	}
 	bios_set_scratch_acc_mode_change(dc->ctx->dc_bios);
 }
-- 
2.40.1