drm/i915/intel_fb: Pull is_surface_linear() from intel_display.c/skl_universal_plane.c

Move is_surface_linear() to intel_fb.c and export it from here, also
removing the duplicate definitions of it.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210325214808.2071517-9-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -1264,12 +1264,6 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
 	return new_offset;
 }
 
-static bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane)
-{
-	return fb->modifier == DRM_FORMAT_MOD_LINEAR ||
-	       is_gen12_ccs_plane(fb, color_plane);
-}
-
 static u32 intel_adjust_aligned_offset(int *x, int *y,
 				       const struct drm_framebuffer *fb,
 				       int color_plane,

drivers/gpu/drm/i915/display/intel_fb.c

@@ -27,6 +27,12 @@ bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane)
 	       plane == 2;
 }
 
+bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane)
+{
+	return fb->modifier == DRM_FORMAT_MOD_LINEAR ||
+	       is_gen12_ccs_plane(fb, color_plane);
+}
+
 int main_to_ccs_plane(const struct drm_framebuffer *fb, int main_plane)
 {
 	drm_WARN_ON(fb->dev, !is_ccs_modifier(fb->modifier) ||

drivers/gpu/drm/i915/display/intel_fb.h

@@ -14,6 +14,8 @@ bool is_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane);
 
+bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane);
+
 int main_to_ccs_plane(const struct drm_framebuffer *fb, int main_plane);
 int skl_ccs_to_main_plane(const struct drm_framebuffer *fb, int ccs_plane);
 int skl_main_to_aux_plane(const struct drm_framebuffer *fb, int main_plane);

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -562,12 +562,6 @@ icl_program_input_csc(struct intel_plane *plane,
 			  PLANE_INPUT_CSC_POSTOFF(pipe, plane_id, 2), 0x0);
 }
 
-static bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane)
-{
-	return fb->modifier == DRM_FORMAT_MOD_LINEAR ||
-	       is_gen12_ccs_plane(fb, color_plane);
-}
-
 static unsigned int skl_plane_stride_mult(const struct drm_framebuffer *fb,
 					  int color_plane, unsigned int rotation)
 {