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Date:   Sun, 14 Jun 2020 22:03:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Derek Basehore <dbasehore@...omium.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sean Paul <sean@...rly.run>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 6/6] drm/tegra: plane: Support 180° rotation

Combining horizontal and vertical reflections gives us 180 degrees of
rotation.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/tegra/dc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index f31bca27cde4..ddd9b88f8fce 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -608,6 +608,7 @@ static int tegra_plane_atomic_check(struct drm_plane *plane,
 {
 	struct tegra_plane_state *plane_state = to_tegra_plane_state(state);
 	unsigned int rotation = DRM_MODE_ROTATE_0 |
+				DRM_MODE_ROTATE_180 |
 				DRM_MODE_REFLECT_X |
 				DRM_MODE_REFLECT_Y;
 	struct tegra_bo_tiling *tiling = &plane_state->tiling;
@@ -659,6 +660,14 @@ static int tegra_plane_atomic_check(struct drm_plane *plane,
 	else
 		plane_state->reflect_y = false;
 
+	if (tegra_fb_is_bottom_up(state->fb))
+		plane_state->reflect_y = true;
+
+	if (rotation & DRM_MODE_ROTATE_180) {
+		plane_state->reflect_x = !plane_state->reflect_x;
+		plane_state->reflect_y = !plane_state->reflect_y;
+	}
+
 	/*
 	 * Tegra doesn't support different strides for U and V planes so we
 	 * error out if the user tries to display a framebuffer with such a
@@ -720,7 +729,7 @@ static void tegra_plane_atomic_update(struct drm_plane *plane,
 	window.dst.h = drm_rect_height(&plane->state->dst);
 	window.bits_per_pixel = fb->format->cpp[0] * 8;
 	window.reflect_x = state->reflect_x;
-	window.reflect_y = tegra_fb_is_bottom_up(fb) || state->reflect_y;
+	window.reflect_y = state->reflect_y;
 
 	/* copy from state */
 	window.zpos = plane->state->normalized_zpos;
@@ -806,6 +815,7 @@ static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm,
 	err = drm_plane_create_rotation_property(&plane->base,
 						 DRM_MODE_ROTATE_0,
 						 DRM_MODE_ROTATE_0 |
+						 DRM_MODE_ROTATE_180 |
 						 DRM_MODE_REFLECT_X |
 						 DRM_MODE_REFLECT_Y);
 	if (err < 0)
@@ -1094,6 +1104,7 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
 	err = drm_plane_create_rotation_property(&plane->base,
 						 DRM_MODE_ROTATE_0,
 						 DRM_MODE_ROTATE_0 |
+						 DRM_MODE_ROTATE_180 |
 						 DRM_MODE_REFLECT_X |
 						 DRM_MODE_REFLECT_Y);
 	if (err < 0)
-- 
2.26.0

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