linux-kernel - [PATCH 1/2] drm/meson: fix primary plane disabling

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Date:   Wed,  5 Jun 2019 16:12:52 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 1/2] drm/meson: fix primary plane disabling

The primary plane disable logic is flawed, when the primary plane is
disabled, it is re-enabled in the vsync irq when another plane is updated.

Handle the plane disabling correctly by handling the primary plane
enable flag in the primary plane update & disable callbacks.

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

diff --git a/drivers/gpu/drm/meson/meson_crtc.c b/drivers/gpu/drm/meson/meson_crtc.c
index 685715144156..50a9a96720b9 100644
--- a/drivers/gpu/drm/meson/meson_crtc.c
+++ b/drivers/gpu/drm/meson/meson_crtc.c
@@ -107,8 +107,6 @@ static void meson_g12a_crtc_atomic_enable(struct drm_crtc *crtc,
 			priv->io_base + _REG(VPP_OUT_H_V_SIZE));
 
 	drm_crtc_vblank_on(crtc);
-
-	priv->viu.osd1_enabled = true;
 }
 
 static void meson_crtc_atomic_enable(struct drm_crtc *crtc,
@@ -137,8 +135,6 @@ static void meson_crtc_atomic_enable(struct drm_crtc *crtc,
 			    priv->io_base + _REG(VPP_MISC));
 
 	drm_crtc_vblank_on(crtc);
-
-	priv->viu.osd1_enabled = true;
 }
 
 static void meson_g12a_crtc_atomic_disable(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/meson/meson_plane.c b/drivers/gpu/drm/meson/meson_plane.c
index 22490047932e..b788280895c6 100644
--- a/drivers/gpu/drm/meson/meson_plane.c
+++ b/drivers/gpu/drm/meson/meson_plane.c
@@ -305,6 +305,8 @@ static void meson_plane_atomic_update(struct drm_plane *plane,
 		meson_plane->enabled = true;
 	}
 
+	priv->viu.osd1_enabled = true;
+
 	spin_unlock_irqrestore(&priv->drm->event_lock, flags);
 }
 
@@ -323,7 +325,7 @@ static void meson_plane_atomic_disable(struct drm_plane *plane,
 				    priv->io_base + _REG(VPP_MISC));
 
 	meson_plane->enabled = false;
-
+	priv->viu.osd1_enabled = false;
 }
 
 static const struct drm_plane_helper_funcs meson_plane_helper_funcs = {
-- 
2.21.0