Modesetting (amdgpudrmfb) artifacts on RAVEN APU

[KARBOWSKI Piotr]

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.