Re: [PATCH] drm/amd/display: Initialize missing TD-LUT programming inputs

[Harry Wentland <harry.wentland@amd.com>]

On 10/11/26 03:45, Avi Weiss wrote:
> dml_core_mode_programming() memsets (clears) its scratch structure
> before calculating TD-LUT settings, but does not initialize
> tdlut_mpc_width_flag or is_gfx11.
>
> Both inputs therefore remain false regardless of the plane
> configuration which can result in incorrect calculations.
>
> Initialize both fields using the same sources as the mode
> support path (now both paths are aligned).
>
> Fixes: 70839da63605 ("drm/amd/display: Add new DCN401 sources")
> Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>

Reviewed-by: Harry Wentland <harry.wentland@amd.com>

The issue sashiko found is also a real problem but somewhat
unrelated.

Harry

> ---
>  .../dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c        | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
> index 72acf12e9251..0ee385e8ba5f 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
> @@ -11074,6 +11074,8 @@ static bool dml_core_mode_programming(struct dml2_core_calcs_mode_programming_ex
>  		calculate_tdlut_setting_params->cursor_buffer_size = mode_lib->ip.cursor_buffer_size;
>  		calculate_tdlut_setting_params->gpuvm_enable = display_cfg->gpuvm_enable;
>  		calculate_tdlut_setting_params->gpuvm_page_size_kbytes = display_cfg->plane_descriptors[k].overrides.gpuvm_min_page_size_kbytes;
> +		calculate_tdlut_setting_params->tdlut_mpc_width_flag = display_cfg->plane_descriptors[k].tdlut.tdlut_mpc_width_flag;
> +		calculate_tdlut_setting_params->is_gfx11 = dml_get_gfx_version(display_cfg->plane_descriptors[k].surface.tiling);
>  
>  		// output
>  		calculate_tdlut_setting_params->tdlut_pte_bytes_per_frame = &s->tdlut_pte_bytes_per_frame[k];