[Intel-gfx] [PATCH] drm/i915/mtl: Add support of Tile4 to MTL

[Juha-Pekka Heikkila]

Hi Stan,

On 19.12.2022 15.50, Stanislav Lisovskiy wrote:
> We have some Tile4 tests now skipping, which were
> supposed to be working. So lets make them work, by
> adding display_ver 14 as supported.
> 
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_fb.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
> index 63137ae5ab217..75a17f38def53 100644
> --- a/drivers/gpu/drm/i915/display/intel_fb.c
> +++ b/drivers/gpu/drm/i915/display/intel_fb.c
> @@ -158,11 +158,11 @@ struct intel_modifier_desc {
>   static const struct intel_modifier_desc intel_modifiers[] = {
>   	{
>   		.modifier = I915_FORMAT_MOD_4_TILED_DG2_MC_CCS,
> -		.display_ver = { 13, 13 },
> +		.display_ver = { 13, 14 },

I don't think you'd want to do this. These DG2 ccs modifiers rely on 
usage of flat ccs which is not present in Meteorlake.

>   		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_MC,
>   	}, {
>   		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC,
> -		.display_ver = { 13, 13 },
> +		.display_ver = { 13, 14 },

Let's drop this change too.

>   		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_RC_CC,
>   
>   		.ccs.cc_planes = BIT(1),
> @@ -170,11 +170,11 @@ static const struct intel_modifier_desc intel_modifiers[] = {
>   		FORMAT_OVERRIDE(gen12_flat_ccs_cc_formats),
>   	}, {
>   		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS,
> -		.display_ver = { 13, 13 },
> +		.display_ver = { 13, 14 },

And this.

>   		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_RC,
>   	}, {
>   		.modifier = I915_FORMAT_MOD_4_TILED,
> -		.display_ver = { 13, 13 },
> +		.display_ver = { 13, 14 },

Here you could do something like ".display_ver = { 13, -1 }," to enable 
tile4 from version 13 onward and we'll fix it if it ever change in the 
future.

/Juha-Pekka

>   		.plane_caps = INTEL_PLANE_CAP_TILING_4,
>   	}, {
>   		.modifier = I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS,