[PATCH 8/9] wip: drm/i915/display: Split surface calculation from skl_check_main_surface()

[José Roberto de Souza]

The offset of surface will needed by PSR2 selective fetch code so
here splitting it to it can be reused.

Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 113 +++++++++++--------
 1 file changed, 66 insertions(+), 47 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index cf1417ff54d7..d1704cf0ba2f 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3889,45 +3889,17 @@ intel_plane_fence_y_offset(const struct intel_plane_state *plane_state)
 	return y;
 }
 
-static int skl_check_main_surface(struct intel_plane_state *plane_state)
+static int skl_calculate_offset(struct intel_plane_state *plane_state, int *x,
+				int *y, u32 *offset, int w, int h)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane_state->uapi.plane->dev);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	unsigned int rotation = plane_state->hw.rotation;
-	int x = plane_state->uapi.src.x1 >> 16;
-	int y = plane_state->uapi.src.y1 >> 16;
-	int w = drm_rect_width(&plane_state->uapi.src) >> 16;
-	int h = drm_rect_height(&plane_state->uapi.src) >> 16;
-	int max_width, min_width, max_height;
-	u32 alignment, offset;
+	u32 alignment;
 	int aux_plane = intel_main_to_aux_plane(fb, 0);
 	u32 aux_offset = plane_state->color_plane[aux_plane].offset;
 
-	if (INTEL_GEN(dev_priv) >= 11) {
-		max_width = icl_max_plane_width(fb, 0, rotation);
-		min_width = icl_min_plane_width(fb);
-	} else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
-		max_width = glk_max_plane_width(fb, 0, rotation);
-		min_width = 1;
-	} else {
-		max_width = skl_max_plane_width(fb, 0, rotation);
-		min_width = 1;
-	}
-
-	if (INTEL_GEN(dev_priv) >= 11)
-		max_height = icl_max_plane_height();
-	else
-		max_height = skl_max_plane_height();
-
-	if (w > max_width || w < min_width || h > max_height) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "requested Y/RGB source size %dx%d outside limits (min: %dx1 max: %dx%d)\n",
-			    w, h, min_width, max_width, max_height);
-		return -EINVAL;
-	}
-
-	intel_add_fb_offsets(&x, &y, plane_state, 0);
-	offset = intel_plane_compute_aligned_offset(&x, &y, plane_state, 0);
+	intel_add_fb_offsets(x, y, plane_state, 0);
+	*offset = intel_plane_compute_aligned_offset(x, y, plane_state, 0);
 	alignment = intel_surf_alignment(fb, 0);
 	if (drm_WARN_ON(&dev_priv->drm, alignment && !is_power_of_2(alignment)))
 		return -EINVAL;
@@ -3937,9 +3909,10 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
 	 * main surface offset, and it must be non-negative. Make
 	 * sure that is what we will get.
 	 */
-	if (aux_plane && offset > aux_offset)
-		offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
-							   offset, aux_offset & ~(alignment - 1));
+	if (aux_plane && *offset > aux_offset)
+		*offset = intel_plane_adjust_aligned_offset(x, y, plane_state, 0,
+							    *offset,
+							    aux_offset & ~(alignment - 1));
 
 	/*
 	 * When using an X-tiled surface, the plane blows up
@@ -3950,15 +3923,16 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
 	if (fb->modifier == I915_FORMAT_MOD_X_TILED) {
 		int cpp = fb->format->cpp[0];
 
-		while ((x + w) * cpp > plane_state->color_plane[0].stride) {
-			if (offset == 0) {
+		while ((*x + w) * cpp > plane_state->color_plane[0].stride) {
+			if (*offset == 0) {
 				drm_dbg_kms(&dev_priv->drm,
 					    "Unable to find suitable display surface offset due to X-tiling\n");
 				return -EINVAL;
 			}
 
-			offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
-								   offset, offset - alignment);
+			*offset = intel_plane_adjust_aligned_offset(x, y, plane_state, 0,
+								    *offset,
+								    *offset - alignment);
 		}
 	}
 
@@ -3967,23 +3941,68 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
 	 * they match with the main surface x/y offsets.
 	 */
 	if (is_ccs_modifier(fb->modifier)) {
-		while (!skl_check_main_ccs_coordinates(plane_state, x, y,
-						       offset, aux_plane)) {
-			if (offset == 0)
+		// skl_check_main_ccs_coordinates changing plane_state
+		while (!skl_check_main_ccs_coordinates(plane_state, *x, *y,
+						       *offset, aux_plane)) {
+			if (*offset == 0)
 				break;
 
-			offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
-								   offset, offset - alignment);
+			*offset = intel_plane_adjust_aligned_offset(x, y, plane_state, 0,
+								    *offset,
+								    *offset - alignment);
 		}
 
-		if (x != plane_state->color_plane[aux_plane].x ||
-		    y != plane_state->color_plane[aux_plane].y) {
+		if (*x != plane_state->color_plane[aux_plane].x ||
+		    *y != plane_state->color_plane[aux_plane].y) {
 			drm_dbg_kms(&dev_priv->drm,
 				    "Unable to find suitable display surface offset due to CCS\n");
 			return -EINVAL;
 		}
 	}
 
+	return 0;
+}
+
+static int skl_check_main_surface(struct intel_plane_state *plane_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(plane_state->uapi.plane->dev);
+	const struct drm_framebuffer *fb = plane_state->hw.fb;
+	unsigned int rotation = plane_state->hw.rotation;
+	int x = plane_state->uapi.src.x1 >> 16;
+	int y = plane_state->uapi.src.y1 >> 16;
+	int w = drm_rect_width(&plane_state->uapi.src) >> 16;
+	int h = drm_rect_height(&plane_state->uapi.src) >> 16;
+	int max_width, min_width, max_height;
+	u32 offset;
+	int ret;
+
+	if (INTEL_GEN(dev_priv) >= 11) {
+		max_width = icl_max_plane_width(fb, 0, rotation);
+		min_width = icl_min_plane_width(fb);
+	} else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
+		max_width = glk_max_plane_width(fb, 0, rotation);
+		min_width = 1;
+	} else {
+		max_width = skl_max_plane_width(fb, 0, rotation);
+		min_width = 1;
+	}
+
+	if (INTEL_GEN(dev_priv) >= 11)
+		max_height = icl_max_plane_height();
+	else
+		max_height = skl_max_plane_height();
+
+	if (w > max_width || w < min_width || h > max_height) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "requested Y/RGB source size %dx%d outside limits (min: %dx1 max: %dx%d)\n",
+			    w, h, min_width, max_width, max_height);
+		return -EINVAL;
+	}
+
+	ret = skl_calculate_offset(plane_state, &x, &y, &offset, w, h);
+	if (ret)
+		return ret;
+
 	plane_state->color_plane[0].offset = offset;
 	plane_state->color_plane[0].x = x;
 	plane_state->color_plane[0].y = y;
-- 
2.28.0