Testing on AMD Carizzo with DCE-11.0 display engine showed that it doesn't like a 36 bpp linebuffer very much. The display just showed a solid green. Testing on RavenRidge DCN-1.0, Polaris11 with DCE-11.2 and Kabini with DCE-8.3 did not expose any problems, so for now only revert to 30 bpp linebuffer depth on asics with DCE-11.0 display engine. Reported-by: Tom StDenis <Tom.StDenis@xxxxxxx> Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx> Cc: Alex Deucher <alexander.deucher@xxxxxxx> --- drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c index b2ee3cd77b4e..a4f1ae8930a4 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c @@ -1213,9 +1213,16 @@ bool resource_build_scaling_params(struct pipe_ctx *pipe_ctx) * on certain displays, such as the Sharp 4k. 36bpp is needed * to support SURFACE_PIXEL_FORMAT_GRPH_ARGB16161616 and * SURFACE_PIXEL_FORMAT_GRPH_ABGR16161616 with actual > 10 bpc - * precision on at least DCN display engines. + * precision on at least DCN display engines. However, at least + * Carrizo with DCE_VERSION_11_0 does not like 36 bpp lb depth, + * so use only 30 bpp on DCE_VERSION_11_0. Testing with DCE 11.2 and 8.3 + * did not show such problems, so this seems to be the exception. */ - pipe_ctx->plane_res.scl_data.lb_params.depth = LB_PIXEL_DEPTH_36BPP; + if (plane_state->ctx->dce_version != DCE_VERSION_11_0) + pipe_ctx->plane_res.scl_data.lb_params.depth = LB_PIXEL_DEPTH_36BPP; + else + pipe_ctx->plane_res.scl_data.lb_params.depth = LB_PIXEL_DEPTH_30BPP; + pipe_ctx->plane_res.scl_data.lb_params.alpha_en = plane_state->per_pixel_alpha; pipe_ctx->plane_res.scl_data.recout.x += timing->h_border_left; -- 2.25.1 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
