[Intel-gfx] [PATCH 4/4] drm/i915: Setup clipped src/dest coordinates during FB reconstruction

[Matt Roper]

Plane state objects contain two copies of src/dest coordinates:  the
original (requested by userspace) coordinates in the base
drm_plane_state object, and a second, clipped copy (i.e., what we
actually want to program to the hardware) in intel_plane_state.  We've
only been setting up the former set of values during boot time FB
reconstruction, but we should really be initializing both.

Note that the code here probably still needs some more work.  We seem to
be making two questionable assumptions:
 * BIOS will program the primary plane to the entire display size
   (potentially false on gen9+ platforms where the primary plane can be
   windowed)
 * The BIOS fb size actually matches the plane/display size.  It seems
   that there's nothing stopping the BIOS from overallocating the FB
   (potentially to do an extended mode FB that spans multiple displays),
   so setting our src/dest coordinates to the FB size here may not
   always be right.

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9fa041c..3145c9d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2601,6 +2601,8 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
 	struct drm_i915_gem_object *obj;
 	struct drm_plane *primary = intel_crtc->base.primary;
 	struct drm_plane_state *plane_state = primary->state;
+	struct intel_plane_state *intel_state =
+		to_intel_plane_state(plane_state);
 	struct drm_framebuffer *fb;
 
 	if (!plane_config->fb)
@@ -2648,6 +2650,15 @@ valid_fb:
 	plane_state->crtc_w = fb->width;
 	plane_state->crtc_h = fb->height;
 
+	intel_state->src.x1 = plane_state->src_x;
+	intel_state->src.y1 = plane_state->src_y;
+	intel_state->src.x2 = plane_state->src_x + plane_state->src_w;
+	intel_state->src.y2 = plane_state->src_y + plane_state->src_h;
+	intel_state->dst.x1 = plane_state->crtc_x;
+	intel_state->dst.y1 = plane_state->crtc_y;
+	intel_state->dst.x2 = plane_state->crtc_x + plane_state->crtc_w;
+	intel_state->dst.y2 = plane_state->crtc_y + plane_state->crtc_h;
+
 	obj = intel_fb_obj(fb);
 	if (obj->tiling_mode != I915_TILING_NONE)
 		dev_priv->preserve_bios_swizzle = true;
-- 
2.1.4