From dd3908c7013f4b2d55e2656dfcdb311bfb46667a Mon Sep 17 00:00:00 2001
From: David Galiffi <David.Galiffi@amd.com>
Date: Mon, 13 Sep 2021 18:05:24 -0400
Subject: drm/amd/display: Add debug support to override the Minimum DRAM Clock
Git-commit: ba9012fcb2741fdc0716493dd583f0f3e164b633
Patch-mainline: v5.16-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]
Requested feature to assist with Thermal, Acoustic, Power, and
Performance tuning.

[How]
Add a debug field that will override calculated minimum DRAM clock,
if the debug value is larger than the calculate value.

Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Signed-off-by: David Galiffi <David.Galiffi@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/dc.h                   | 1 +
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index b194a2727bd8..a46c663ed8c5 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -565,6 +565,7 @@ struct dc_debug_options {
 	enum wm_report_mode pplib_wm_report_mode;
 	unsigned int min_disp_clk_khz;
 	unsigned int min_dpp_clk_khz;
+	unsigned int min_dram_clk_khz;
 	int sr_exit_time_dpm0_ns;
 	int sr_enter_plus_exit_time_dpm0_ns;
 	int sr_exit_time_ns;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index 3c388afa06dc..aeb868ace31c 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -3117,6 +3117,10 @@ void dcn20_calculate_dlg_params(
 	context->bw_ctx.bw.dcn.clk.dcfclk_khz = context->bw_ctx.dml.vba.DCFCLK * 1000;
 	context->bw_ctx.bw.dcn.clk.socclk_khz = context->bw_ctx.dml.vba.SOCCLK * 1000;
 	context->bw_ctx.bw.dcn.clk.dramclk_khz = context->bw_ctx.dml.vba.DRAMSpeed * 1000 / 16;
+
+	if (dc->debug.min_dram_clk_khz > context->bw_ctx.bw.dcn.clk.dramclk_khz)
+		context->bw_ctx.bw.dcn.clk.dramclk_khz = dc->debug.min_dram_clk_khz;
+
 	context->bw_ctx.bw.dcn.clk.dcfclk_deep_sleep_khz = context->bw_ctx.dml.vba.DCFCLKDeepSleep * 1000;
 	context->bw_ctx.bw.dcn.clk.fclk_khz = context->bw_ctx.dml.vba.FabricClock * 1000;
 	context->bw_ctx.bw.dcn.clk.p_state_change_support =
-- 
2.38.1