[PATCH 2/2] drm/meson: fix G12A primary plane disabling

[Neil Armstrong]

The G12A Primary plane was disabled by writing in the OSD1 configuration
registers, but this caused the plane blender to stall instead of continuing
blended only the overlay plane.

Fix this by disabling the OSD1 plane in the blender registers, and also
enabling it back using the same register.

Fixes: 490f50c109d1 ("drm/meson: Add G12A support for OSD1 Plane")
Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
 drivers/gpu/drm/meson/meson_crtc.c  | 2 ++
 drivers/gpu/drm/meson/meson_plane.c | 4 ++--
 drivers/gpu/drm/meson/meson_viu.c   | 3 +--
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_crtc.c b/drivers/gpu/drm/meson/meson_crtc.c
index 50a9a96720b9..aa8ea107524e 100644
--- a/drivers/gpu/drm/meson/meson_crtc.c
+++ b/drivers/gpu/drm/meson/meson_crtc.c
@@ -252,6 +252,8 @@ static void meson_g12a_crtc_enable_osd1(struct meson_drm *priv)
 	writel_relaxed(priv->viu.osb_blend1_size,
 		       priv->io_base +
 		       _REG(VIU_OSD_BLEND_BLEND1_SIZE));
+	writel_bits_relaxed(3 << 8, 3 << 8,
+			    priv->io_base + _REG(OSD1_BLEND_SRC_CTRL));
 }
 
 static void meson_crtc_enable_vd1(struct meson_drm *priv)
diff --git a/drivers/gpu/drm/meson/meson_plane.c b/drivers/gpu/drm/meson/meson_plane.c
index b788280895c6..d90427b93a51 100644
--- a/drivers/gpu/drm/meson/meson_plane.c
+++ b/drivers/gpu/drm/meson/meson_plane.c
@@ -318,8 +318,8 @@ static void meson_plane_atomic_disable(struct drm_plane *plane,
 
 	/* Disable OSD1 */
 	if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu"))
-		writel_bits_relaxed(BIT(0) | BIT(21), 0,
-			priv->io_base + _REG(VIU_OSD1_CTRL_STAT));
+		writel_bits_relaxed(3 << 8, 0,
+				    priv->io_base + _REG(OSD1_BLEND_SRC_CTRL));
 	else
 		writel_bits_relaxed(VPP_OSD1_POSTBLEND, 0,
 				    priv->io_base + _REG(VPP_MISC));
diff --git a/drivers/gpu/drm/meson/meson_viu.c b/drivers/gpu/drm/meson/meson_viu.c
index 462c7cb3e1bd..4b2b3024d371 100644
--- a/drivers/gpu/drm/meson/meson_viu.c
+++ b/drivers/gpu/drm/meson/meson_viu.c
@@ -405,8 +405,7 @@ void meson_viu_init(struct meson_drm *priv)
 				0 << 16 |
 				1,
 				priv->io_base + _REG(VIU_OSD_BLEND_CTRL));
-		writel_relaxed(3 << 8 |
-				1 << 20,
+		writel_relaxed(1 << 20,
 				priv->io_base + _REG(OSD1_BLEND_SRC_CTRL));
 		writel_relaxed(1 << 20,
 				priv->io_base + _REG(OSD2_BLEND_SRC_CTRL));
-- 
2.21.0