linux-kernel - [PATCH 4.9 06/77] drm/sun4i: Implement drm_driver lastclose to restore fbdev console

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Message-Id: <20170924203243.149192840@linuxfoundation.org>
Date:   Sun, 24 Sep 2017 22:31:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olliver Schinagl <oliver@...inagl.nl>,
        Chen-Yu Tsai <wens@...e.org>, Jonathan Liu <net147@...il.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH 4.9 06/77] drm/sun4i: Implement drm_driver lastclose to restore fbdev console

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jonathan Liu <net147@...il.com>

commit 2a596fc9d974bb040eda9ab70bf8756fcaaa6afe upstream.

The drm_driver lastclose callback is called when the last userspace
DRM client has closed. Call drm_fbdev_cma_restore_mode to restore
the fbdev console otherwise the fbdev console will stop working.

Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
Tested-by: Olliver Schinagl <oliver@...inagl.nl>
Reviewed-by: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Jonathan Liu <net147@...il.com>
Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
[net147@...il.com: Backport to 4.9, minor context change]
Signed-off-by: Jonathan Liu <net147@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


---
 drivers/gpu/drm/sun4i/sun4i_drv.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -47,6 +47,13 @@ static void sun4i_drv_disable_vblank(str
 	sun4i_tcon_enable_vblank(tcon, false);
 }
 
+static void sun4i_drv_lastclose(struct drm_device *dev)
+{
+	struct sun4i_drv *drv = dev->dev_private;
+
+	drm_fbdev_cma_restore_mode(drv->fbdev);
+}
+
 static const struct file_operations sun4i_drv_fops = {
 	.owner		= THIS_MODULE,
 	.open		= drm_open,
@@ -65,6 +72,7 @@ static struct drm_driver sun4i_drv_drive
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
 
 	/* Generic Operations */
+	.lastclose		= sun4i_drv_lastclose,
 	.fops			= &sun4i_drv_fops,
 	.name			= "sun4i-drm",
 	.desc			= "Allwinner sun4i Display Engine",