[PATCH 3/6] drm/vkms: add rotate-270 property

[Maíra Canal]

Currently, vkms only supports the rotate-90 and rotate-180 properties.
Therefore, improve the vkms IGT test coverage by adding the rotate-270
property to vkms. The rotation was implement by software: rotate the way
the blending occurs by making the source x axis be the destination y axis
and the source y axis be the destination x axis and reverse-read the axis.

Tested with igt at kms_rotation_crc@primary-rotation-270, and
igt at kms_rotation_crc@sprite-rotation-270.

Signed-off-by: Maíra Canal <mcanal at igalia.com>
---
 drivers/gpu/drm/vkms/vkms_composer.c | 12 ++++++++++--
 drivers/gpu/drm/vkms/vkms_formats.c  |  7 ++++---
 drivers/gpu/drm/vkms/vkms_plane.c    |  6 ++++--
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index ef4e5181d512..25d412f555ae 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -4,6 +4,7 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_blend.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_vblank.h>
@@ -23,6 +24,9 @@ static struct pixel_argb_u16 *get_out_buffer(const struct vkms_frame_info *frame
 	case DRM_MODE_ROTATE_180:
 		out -= frame_info->dst.x1;
 		break;
+	case DRM_MODE_ROTATE_270:
+		out += frame_info->dst.y1;
+		break;
 	default:
 		out += frame_info->dst.x1;
 		break;
@@ -63,7 +67,7 @@ static void pre_mul_alpha_blend(struct vkms_frame_info *frame_info,
 	struct pixel_argb_u16 *in = stage_buffer->pixels;
 	int limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels);
 
-	if (frame_info->rotation & DRM_MODE_ROTATE_90)
+	if (drm_rotation_90_or_270(frame_info->rotation))
 		limit = min_t(size_t, drm_rect_height(&frame_info->dst), stage_buffer->n_pixels);
 
 	for (int x = 0; x < limit; x++) {
@@ -83,6 +87,10 @@ static int get_y_pos(struct vkms_frame_info *frame_info, int y)
 		return frame_info->dst.x2 - y - 1;
 	case DRM_MODE_ROTATE_180:
 		return drm_rect_height(&frame_info->dst) - y - 1;
+	case DRM_MODE_ROTATE_270:
+		if (y + frame_info->dst.x1 < 0)
+			return -1;
+		return y + frame_info->dst.x1;
 	default:
 		return y;
 	}
@@ -90,7 +98,7 @@ static int get_y_pos(struct vkms_frame_info *frame_info, int y)
 
 static bool check_limit(struct vkms_frame_info *frame_info, int pos)
 {
-	if (frame_info->rotation & DRM_MODE_ROTATE_90) {
+	if (drm_rotation_90_or_270(frame_info->rotation)) {
 		if (pos >= 0 && pos < drm_rect_width(&frame_info->dst))
 			return true;
 	} else {
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index b874786be6b1..07976194882b 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -2,6 +2,7 @@
 
 #include <linux/kernel.h>
 #include <linux/minmax.h>
+#include <drm/drm_blend.h>
 #include <drm/drm_rect.h>
 #include <drm/drm_fixed.h>
 
@@ -44,21 +45,21 @@ static void *get_packed_src_addr(const struct vkms_frame_info *frame_info, int y
 
 static int get_x_position(const struct vkms_frame_info *frame_info, int x_limit, int x)
 {
-	if (frame_info->rotation & DRM_MODE_ROTATE_180)
+	if (frame_info->rotation & (DRM_MODE_ROTATE_180 | DRM_MODE_ROTATE_270))
 		return x_limit - x - 1;
 	return x;
 }
 
 static int get_limit(const struct vkms_frame_info *frame_info, struct line_buffer *stage_buffer)
 {
-	if (frame_info->rotation & DRM_MODE_ROTATE_90)
+	if (drm_rotation_90_or_270(frame_info->rotation))
 		return min_t(size_t, drm_rect_height(&frame_info->dst), stage_buffer->n_pixels);
 	return min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels);
 }
 
 static u8 *get_src_pixels(const struct vkms_frame_info *frame_info, int x, int y, int pixel_size)
 {
-	if (frame_info->rotation & DRM_MODE_ROTATE_90)
+	if (drm_rotation_90_or_270(frame_info->rotation))
 		return get_packed_src_addr(frame_info, x + frame_info->dst.y1) + pixel_size * y;
 	return get_packed_src_addr(frame_info, y) + pixel_size * x;
 }
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 94c1e5d891cc..abaacad3bef2 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -124,7 +124,8 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
 	frame_info->rotation = drm_rotation_simplify(new_state->rotation,
 						     DRM_MODE_ROTATE_0 |
 						     DRM_MODE_ROTATE_90 |
-						     DRM_MODE_ROTATE_180);
+						     DRM_MODE_ROTATE_180 |
+						     DRM_MODE_ROTATE_270);
 
 	drm_rect_rotate(&frame_info->dst, drm_rect_width(&frame_info->dst),
 			drm_rect_height(&frame_info->dst), frame_info->rotation);
@@ -241,7 +242,8 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 	drm_plane_create_rotation_property(&plane->base, DRM_MODE_ROTATE_0,
 					   DRM_MODE_ROTATE_0 |
 					   DRM_MODE_ROTATE_90 |
-					   DRM_MODE_ROTATE_180);
+					   DRM_MODE_ROTATE_180 |
+					   DRM_MODE_ROTATE_270);
 
 	return plane;
 }
-- 
2.39.2