From 5704cdb0a5ad95cf66a2fa11d07d74909a1aeaa8 Mon Sep 17 00:00:00 2001
From: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Date: Thu, 5 May 2022 16:16:47 -0400
Subject: drm/amd/display: Fic incorrect pipe being used for clk update
Git-commit: a32cc8177eabcd3497721836241f3d456342be62
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

[Why]
we save the prev_dppclk value using "dpp_inst" but
when reading this value we use the index "i". In
a case where a pipe is fused off we can end up reading
the incorrect instance because i != dpp_inst in this
case.

[How]
read the prev_dppclk using dpp_inst instead of i

Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 02943ca65807..cf1b5f354ae9 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
@@ -122,7 +122,7 @@ static void rn_update_clocks_update_dpp_dto(struct clk_mgr_internal *clk_mgr,
 		dpp_inst = clk_mgr->base.ctx->dc->res_pool->dpps[i]->inst;
 		dppclk_khz = context->res_ctx.pipe_ctx[i].plane_res.bw.dppclk_khz;
 
-		prev_dppclk_khz = clk_mgr->dccg->pipe_dppclk_khz[i];
+		prev_dppclk_khz = clk_mgr->dccg->pipe_dppclk_khz[dpp_inst];
 
 		if (safe_to_lower || prev_dppclk_khz < dppclk_khz)
 			clk_mgr->dccg->funcs->update_dpp_dto(
-- 
2.38.1