[PATCH] drm/mediatek: Set Rotation default value to 1.

[Mark Yacoub]

From: Mark Yacoub <markyacoub at google.com>

[Why]
The Rotation prob is a bitmask value. It must always have a valid value.
A default NO rotation is equal to 1 not 0.

[How]
1. At the reset hook, call __drm_atomic_helper_plane_reset which is
called at the initialization of the plane and sets the default value of
all planes to DRM_MODE_ROTATE_0 which is equal to 1.
2. At the ovl layer check, do no overwrite the state->rotation value 0
if DRM_MODE_ROTATE_0 is set. We should not change the value that the
userspace has set, especially if it's an unsupported value.

Tested on Jacuzzi(MTK).
Fixes IGT at kms_properties@plane-properties-{legacy,atomic} and
IGT at kms_properties@get_properties-sanity-{atomic,non-atomic}

Signed-off-by: Mark Yacoub <markyacoub at chromium.org>
---
 drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  2 +-
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c     | 20 +++++++-------------
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  5 ++---
 drivers/gpu/drm/mediatek/mtk_drm_plane.c    |  3 ++-
 4 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 86c3068894b11..2fc566964f68e 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -64,7 +64,7 @@ void mtk_ovl_config(struct device *dev, unsigned int w,
 		    unsigned int h, unsigned int vrefresh,
 		    unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
 int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
-			struct mtk_plane_state *mtk_state);
+			const struct mtk_plane_state *mtk_state);
 void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 			  struct mtk_plane_state *state,
 			  struct cmdq_pkt *cmdq_pkt);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index ea5760f856ec6..13999564304bc 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -190,19 +190,15 @@ unsigned int mtk_ovl_supported_rotations(struct device *dev)
 }
 
 int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
-			struct mtk_plane_state *mtk_state)
+			const struct mtk_plane_state *mtk_state)
 {
-	struct drm_plane_state *state = &mtk_state->base;
-	unsigned int rotation = 0;
+	const struct drm_plane_state *state = &mtk_state->base;
+	unsigned int rotation = drm_rotation_simplify(
+		state->rotation,
+		DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y);
 
-	rotation = drm_rotation_simplify(state->rotation,
-					 DRM_MODE_ROTATE_0 |
-					 DRM_MODE_REFLECT_X |
-					 DRM_MODE_REFLECT_Y);
-	rotation &= ~DRM_MODE_ROTATE_0;
-
-	/* We can only do reflection, not rotation */
-	if ((rotation & DRM_MODE_ROTATE_MASK) != 0)
+	/* We can only do reflection, not non-zero rotation */
+	if (((rotation & ~DRM_MODE_ROTATE_0) & DRM_MODE_ROTATE_MASK) != 0)
 		return -EINVAL;
 
 	/*
@@ -212,8 +208,6 @@ int mtk_ovl_layer_check(struct device *dev, unsigned int idx,
 	if (state->fb->format->is_yuv && rotation != 0)
 		return -EINVAL;
 
-	state->rotation = rotation;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index 1b582262b682b..530bdd031933f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -53,9 +53,8 @@ struct mtk_ddp_comp_funcs {
 	void (*disable_vblank)(struct device *dev);
 	unsigned int (*supported_rotations)(struct device *dev);
 	unsigned int (*layer_nr)(struct device *dev);
-	int (*layer_check)(struct device *dev,
-			   unsigned int idx,
-			   struct mtk_plane_state *state);
+	int (*layer_check)(struct device *dev, unsigned int idx,
+			   const struct mtk_plane_state *state);
 	void (*layer_config)(struct device *dev, unsigned int idx,
 			     struct mtk_plane_state *state,
 			     struct cmdq_pkt *cmdq_pkt);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index e6dcb34d30522..accd26481b9fb 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -44,9 +44,10 @@ static void mtk_plane_reset(struct drm_plane *plane)
 		state = kzalloc(sizeof(*state), GFP_KERNEL);
 		if (!state)
 			return;
-		plane->state = &state->base;
 	}
 
+	__drm_atomic_helper_plane_reset(plane, &state->base);
+
 	state->base.plane = plane;
 	state->pending.format = DRM_FORMAT_RGB565;
 }
-- 
2.33.0.1079.g6e70778dc9-goog