Re: Modesetting (amdgpudrmfb) artifacts on RAVEN APU

From: KARBOWSKI Piotr <piotr.karbowski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Harry Wentland <harry.wentland-5C7GfCeVMHo@public.gmane.org>,
	Tom St Denis <tstdenis-5C7GfCeVMHo@public.gmane.org>
Cc: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: Modesetting (amdgpudrmfb) artifacts on RAVEN APU
Date: Wed, 7 Mar 2018 22:23:12 +0100	[thread overview]
Message-ID: <1f46c520-720a-8fef-0fd2-2a8845c8a361@gmail.com> (raw)
In-Reply-To: <d5cd41f1-07d6-0e6f-ce8e-b03b4c72f145-5C7GfCeVMHo@public.gmane.org>

On 2018-03-07 22:15, Harry Wentland wrote:
> amd-stg has some other patches relating to DCN pipe-split that I don't fully understand. We might need one or more of those.
> 
> As a workaround you can probably set 'force_single_disp_pipe_split' to 'false' in 'debug_defaults_drv' in dc/dcn10/dcn10_resource.c.


Thank you for the information. This indeed make it working on 
drm-fixes-4.16.

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
index 44825e2c9ebb..df5eefbcc854 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -444,7 +444,7 @@ static const struct dc_debug debug_defaults_drv = {
                 .disable_pplib_wm_range = false,
                 .pplib_wm_report_mode = WM_REPORT_DEFAULT,
                 .pipe_split_policy = MPC_SPLIT_AVOID_MULT_DISP,
-               .force_single_disp_pipe_split = true,
+               .force_single_disp_pipe_split = false,
                 .disable_dcc = DCC_ENABLE,
                 .voltage_align_fclk = true,
                 .disable_stereo_support = true,


-- Piotr.
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