drm/i915: Introduce fb->min_alignment

Different planes could have different alignment requirements
even for the same format/modifier. Collect the alignment
requirements across all planes capable of scanning out the
fb such that the alignment is satisfactory to all those
planes.

So far this was sort of handled by making sure intel_surf_alignment()
declares the superset of all planes' alignment requirements,
but maintaining that manually is annoying. So we're going to move
towards each plane declaring only its own requirements, and thus
we need code to generate the superset.

v2: Drop the borked per-plane vma optimization (Imre)
    Assert that the plane's declared alignment is POT (Imre)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240612204712.31404-5-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_fb_pin.c b/drivers/gpu/drm/i915/display/intel_fb_pin.c
index 9b0f1ea41b70..575b271e012b 100644
--- a/drivers/gpu/drm/i915/display/intel_fb_pin.c
+++ b/drivers/gpu/drm/i915/display/intel_fb_pin.c
@@ -233,10 +233,9 @@ void intel_fb_unpin_vma(struct i915_vma *vma, unsigned long flags)
 static unsigned int
 intel_plane_fb_min_alignment(const struct intel_plane_state *plane_state)
 {
-	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
-	const struct drm_framebuffer *fb = plane_state->hw.fb;
+	const struct intel_framebuffer *fb = to_intel_framebuffer(plane_state->hw.fb);
 
-	return plane->min_alignment(plane, fb, 0);
+	return fb->min_alignment;
 }
 
 static unsigned int