[PATCH 6/8] drm/amd/display: Set DC options from modifiers.

[Bas Nieuwenhuizen]

This sets the DC tiling options from the modifier, if modifiers
are used for the FB. This patch by itself does not expose the
support yet though.

There is not much validation yet to limit the scope of this
patch, but the current validation is at the same level as
the BO metadata path.

Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 109 +++++++++++++++++-
 1 file changed, 103 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6ef7f2f8acab..ac913b8f10ef 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3754,6 +3754,93 @@ fill_gfx9_plane_attributes_from_flags(struct amdgpu_device *adev,
 	return 0;
 }
 
+static bool
+modifier_has_dcc(uint64_t modifier)
+{
+	return IS_AMD_FMT_MOD(modifier) && AMD_FMT_MOD_GET(DCC, modifier);
+}
+
+static unsigned
+modifier_gfx9_swizzle_mode(uint64_t modifier)
+{
+	if (modifier == DRM_FORMAT_MOD_LINEAR)
+		return 0;
+
+	return AMD_FMT_MOD_GET(TILE, modifier);
+}
+
+static void
+fill_gfx9_tiling_info_from_modifier(const struct amdgpu_device *adev,
+				  union dc_tiling_info *tiling_info,
+				  uint64_t modifier)
+{
+	unsigned int mod_bank_xor_bits = AMD_FMT_MOD_GET(BANK_XOR_BITS, modifier);
+	unsigned int mod_pipe_xor_bits = AMD_FMT_MOD_GET(PIPE_XOR_BITS, modifier);
+	unsigned int pkrs_log2 = AMD_FMT_MOD_GET(PACKERS, modifier);
+	unsigned int pipes_log2 = min(4u, mod_pipe_xor_bits);
+
+	fill_gfx9_tiling_info_from_device(adev, tiling_info);
+
+	if (!IS_AMD_FMT_MOD(modifier))
+		return;
+
+	tiling_info->gfx9.num_pipes = 1u << pipes_log2;
+	tiling_info->gfx9.num_shader_engines = 1u << (mod_pipe_xor_bits - pipes_log2);
+
+	if (adev->family >= AMDGPU_FAMILY_NV) {
+		tiling_info->gfx9.num_pkrs = 1u << pkrs_log2;
+	} else {
+		tiling_info->gfx9.num_banks = 1u << mod_bank_xor_bits;
+
+		/* for DCC we know it isn't rb aligned, so rb_per_se doesn't matter. */
+	}
+}
+
+static void
+block_alignment(unsigned int blocksize_log2, unsigned int *width, unsigned int *height)
+{
+	unsigned int height_log2 = blocksize_log2 / 2;
+	unsigned int width_log2 = blocksize_log2 - height_log2;
+
+	*width = 1u << width_log2;
+	*height = 1u << height_log2;
+}
+
+static int
+fill_gfx9_plane_attributes_from_modifiers(struct amdgpu_device *adev,
+				      const struct amdgpu_framebuffer *afb,
+				      const enum surface_pixel_format format,
+				      const enum dc_rotation_angle rotation,
+				      const struct plane_size *plane_size,
+				      union dc_tiling_info *tiling_info,
+				      struct dc_plane_dcc_param *dcc,
+				      struct dc_plane_address *address,
+				      const bool force_disable_dcc)
+{
+	const uint64_t modifier = afb->base.modifier;
+	int ret;
+
+	fill_gfx9_tiling_info_from_modifier(adev, tiling_info, modifier);
+	tiling_info->gfx9.swizzle = modifier_gfx9_swizzle_mode(modifier);
+
+	if (modifier_has_dcc(modifier) && !force_disable_dcc) {
+		uint64_t dcc_address = afb->address + afb->base.offsets[1];
+
+		dcc->enable = 1;
+		dcc->meta_pitch = afb->base.pitches[1];
+		dcc->independent_64b_blks = AMD_FMT_MOD_GET(DCC_INDEPENDENT_64B, modifier);
+
+		address->grph.meta_addr.low_part = lower_32_bits(dcc_address);
+		address->grph.meta_addr.high_part = upper_32_bits(dcc_address);
+	}
+
+	ret = validate_dcc(adev, format, rotation, tiling_info, dcc, address, plane_size);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static int
 fill_plane_buffer_attributes(struct amdgpu_device *adev,
 			     const struct amdgpu_framebuffer *afb,
@@ -3823,12 +3910,22 @@ fill_plane_buffer_attributes(struct amdgpu_device *adev,
 
 
 	if (adev->family >= AMDGPU_FAMILY_AI) {
-		ret = fill_gfx9_plane_attributes_from_flags(adev, afb, format, rotation,
-							    plane_size, tiling_info, dcc,
-							    address, tiling_flags,
-							    force_disable_dcc);
-		if (ret)
-			return ret;
+		if (afb->base.flags & DRM_MODE_FB_MODIFIERS) {
+			ret = fill_gfx9_plane_attributes_from_modifiers(adev, afb, format,
+								      rotation, plane_size,
+								      tiling_info, dcc,
+								      address,
+								      force_disable_dcc);
+			if (ret)
+				return ret;
+		} else {
+			ret = fill_gfx9_plane_attributes_from_flags(adev, afb, format, rotation,
+								  plane_size, tiling_info, dcc,
+								  address, tiling_flags,
+								  force_disable_dcc);
+			if (ret)
+				return ret;
+		}
 	} else {
 		fill_gfx8_tiling_info_from_flags(tiling_info, tiling_flags);
 	}
-- 
2.28.0