From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Fri, 10 Jun 2022 21:44:41 +0000 (-0400)
Subject: drm/amd/display: disable otg toggle w/a on boot
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8a077d9caa3a274de36ee2fe7b608041f5690343;p=linux.git

drm/amd/display: disable otg toggle w/a on boot

This w/a has a bad interaction with seamless boot toggling an
active stream. Most panels recover, however some fail leading
to display corruption.

Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
index f4381725b2107..36b0cd47c1c74 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
@@ -173,11 +173,14 @@ static void dcn315_update_clocks(struct clk_mgr *clk_mgr_base,
 	}
 
 	if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz)) {
-		dcn315_disable_otg_wa(clk_mgr_base, true);
+		/* No need to apply the w/a if we haven't taken over from bios yet */
+		if (clk_mgr_base->clks.dispclk_khz)
+			dcn315_disable_otg_wa(clk_mgr_base, true);
 
 		clk_mgr_base->clks.dispclk_khz = new_clocks->dispclk_khz;
 		dcn315_smu_set_dispclk(clk_mgr, clk_mgr_base->clks.dispclk_khz);
-		dcn315_disable_otg_wa(clk_mgr_base, false);
+		if (clk_mgr_base->clks.dispclk_khz)
+			dcn315_disable_otg_wa(clk_mgr_base, false);
 
 		update_dispclk = true;
 	}