From b368d3ecab2db45a4fa296fe825d4ef6893f4620 Mon Sep 17 00:00:00 2001
From: Sean Paul <seanpaul@chromium.org>
Date: Tue, 5 Nov 2019 16:10:23 -0500
Subject: drm/mediatek: Support reflect-x plane rotation
Git-commit: b368d3ecab2db45a4fa296fe825d4ef6893f4620
Patch-mainline: v5.5-rc1
References: bsc#1152472

Add support for REFLECT_X rotations.

Cc: Fritz Koenig <frkoenig@chromium.org>
Cc: Daniele Castagna <dcastagna@chromium.org>
Cc: Miguel Casas <mcasas@chromium.org>
Cc: Mark Yacoub <markyacoub@google.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index fae10aead3d5..f4c4d3fedc5f 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -53,6 +53,7 @@
 #define	OVL_CON_AEN		BIT(8)
 #define	OVL_CON_ALPHA		0xff
 #define	OVL_CON_VIRT_FLIP	BIT(9)
+#define	OVL_CON_HORZ_FLIP	BIT(10)
 
 struct mtk_disp_ovl_data {
 	unsigned int addr;
@@ -142,7 +143,8 @@ static unsigned int mtk_ovl_layer_nr(struct mtk_ddp_comp *comp)
 
 static unsigned int mtk_ovl_supported_rotations(struct mtk_ddp_comp *comp)
 {
-	return DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y;
+	return DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y |
+	       DRM_MODE_REFLECT_X;
 }
 
 static int mtk_ovl_layer_check(struct mtk_ddp_comp *comp, unsigned int idx,
@@ -153,6 +155,7 @@ static int mtk_ovl_layer_check(struct mtk_ddp_comp *comp, unsigned int idx,
 
 	rotation = drm_rotation_simplify(state->rotation,
 					 DRM_MODE_ROTATE_0 |
+					 DRM_MODE_REFLECT_X |
 					 DRM_MODE_REFLECT_Y);
 	rotation &= ~DRM_MODE_ROTATE_0;
 
@@ -269,6 +272,11 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
 		addr += (pending->height - 1) * pending->pitch;
 	}
 
+	if (pending->rotation & DRM_MODE_REFLECT_X) {
+		con |= OVL_CON_HORZ_FLIP;
+		addr += pending->pitch - 1;
+	}
+
 	writel_relaxed(con, comp->regs + DISP_REG_OVL_CON(idx));
 	writel_relaxed(pitch, comp->regs + DISP_REG_OVL_PITCH(idx));
 	writel_relaxed(src_size, comp->regs + DISP_REG_OVL_SRC_SIZE(idx));
-- 
2.28.0