Commit 3c08d625 authored Jun 08, 2020 by Peikang Zhang Committed by Alex Deucher Jul 01, 2020

drm/amd/display: Red screen observed on startup



[Why]
We try to to change new_clocks->dppclk_khz to 100000 when
new_clocks->dppclk_khz is 0

[How]
Don't change new_clocks->dppclk_khz value when new_clocks->dppclk_khz is
0

Signed-off-by: Peikang Zhang <peikang.zhang@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 5e908012

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -153,8 +153,9 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
		}

		// workaround: Limit dppclk to 100Mhz to avoid lower eDP panel switch to plus 4K monitor underflow.
		// Do not adjust dppclk if dppclk is 0 to avoid unexpected result
		if (!IS_DIAG_DC(dc->ctx->dce_environment)) {
		if (new_clocks->dppclk_khz < 100000)
		if (new_clocks->dppclk_khz < 100000 && new_clocks->dppclk_khz > 0)
		new_clocks->dppclk_khz = 100000;
		}

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