[PATCH 1/2] drm: Adding rotation to drm_plane_helper_check_update

[Sonika Jindal <sonika.jindal@xxxxxxxxx>]

Taking rotation into account while checking the plane
and adjusting the sizes accordingly.

Signed-off-by: Sonika Jindal <sonika.jindal@xxxxxxxxx>
---
 drivers/gpu/drm/drm_plane_helper.c |   79 ++++++++++++++++++++++++++++++++++--
 include/drm/drm_plane_helper.h     |    3 +-
 2 files changed, 77 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index f24c4cf..4badd69 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -138,9 +138,13 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
 				    int max_scale,
 				    bool can_position,
 				    bool can_update_disabled,
-				    bool *visible)
+				    bool *visible,
+				    unsigned int rotation)
 {
 	int hscale, vscale;
+	int crtc_x, crtc_y;
+	unsigned int crtc_w, crtc_h;
+	uint32_t src_x, src_y, src_w, src_h;
 
 	if (!fb) {
 		*visible = false;
@@ -158,9 +162,13 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
 		return -EINVAL;
 	}
 
+	if (fb)
+		drm_rect_rotate(src, fb->width << 16, fb->height << 16,
+				rotation);
+
 	/* Check scaling */
-	hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);
-	vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);
+	hscale = drm_rect_calc_hscale_relaxed(src, dest, min_scale, max_scale);
+	vscale = drm_rect_calc_vscale_relaxed(src, dest, min_scale, max_scale);
 	if (hscale < 0 || vscale < 0) {
 		DRM_DEBUG_KMS("Invalid scaling of plane\n");
 		return -ERANGE;
@@ -182,6 +190,68 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
 		return -EINVAL;
 	}
 
+	crtc_x = dest->x1;
+	crtc_y = dest->y1;
+	crtc_w = drm_rect_width(dest);
+	crtc_h = drm_rect_height(dest);
+
+	if (*visible) {
+		/* check again in case clipping clamped the results */
+		hscale = drm_rect_calc_hscale(src, dest,
+						DRM_PLANE_HELPER_NO_SCALING,
+						DRM_PLANE_HELPER_NO_SCALING);
+		if (hscale < 0) {
+			DRM_DEBUG_KMS("Horizontal scaling factor out of limits\n");
+			drm_rect_debug_print(src, true);
+			drm_rect_debug_print(dest, false);
+
+			return hscale;
+		}
+
+		vscale = drm_rect_calc_vscale(src, dest,
+						DRM_PLANE_HELPER_NO_SCALING,
+						DRM_PLANE_HELPER_NO_SCALING);
+		if (vscale < 0) {
+			DRM_DEBUG_KMS("Vertical scaling factor out of limits\n");
+			drm_rect_debug_print(src, true);
+			drm_rect_debug_print(dest, false);
+
+			return vscale;
+		}
+
+		/* Make the source viewport size an exact multiple of the scaling factors. */
+		drm_rect_adjust_size(src,
+			drm_rect_width(dest) * hscale - drm_rect_width(src),
+			drm_rect_height(dest) * vscale - drm_rect_height(src));
+
+		drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16,
+				    rotation);
+
+		/*
+		 * Hardware doesn't handle subpixel coordinates.
+		 * Adjust to (macro)pixel boundary, but be careful not to
+		 * increase the source viewport size, because that could
+		 * push the downscaling factor out of bounds.
+		 */
+		src_x = src->x1 >> 16;
+		src_w = drm_rect_width(src) >> 16;
+		src_y = src->y1 >> 16;
+		src_h = drm_rect_height(src) >> 16;
+	}
+
+	if (*visible) {
+		src->x1 = src_x;
+		src->x2 = src_x + src_w;
+		src->y1 = src_y;
+		src->y2 = src_y + src_h;
+	}
+
+	dest->x1 = crtc_x;
+	dest->x2 = crtc_x + crtc_w;
+	dest->y1 = crtc_y;
+	dest->y2 = crtc_y + crtc_h;
+
+
 	return 0;
 }
 EXPORT_SYMBOL(drm_plane_helper_check_update);
@@ -258,7 +328,8 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 					    &src, &dest, &clip,
 					    DRM_PLANE_HELPER_NO_SCALING,
 					    DRM_PLANE_HELPER_NO_SCALING,
-					    false, false, &visible);
+					    false, false, &visible,
+					    DRM_ROTATE_0);
 	if (ret)
 		return ret;
 
diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
index a185392..ef9eb04 100644
--- a/include/drm/drm_plane_helper.h
+++ b/include/drm/drm_plane_helper.h
@@ -84,7 +84,8 @@ extern int drm_plane_helper_check_update(struct drm_plane *plane,
 					 int max_scale,
 					 bool can_position,
 					 bool can_update_disabled,
-					 bool *visible);
+					 bool *visible,
+					 unsigned int rotation);
 extern int drm_primary_helper_update(struct drm_plane *plane,
 				     struct drm_crtc *crtc,
 				     struct drm_framebuffer *fb,
-- 
1.7.10.4

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