OMAP: DSS2: don't power off a panel twice

If we blank the panel by
echo 1 > /sys/devices/platform/omapfb/graphics/fb0/blank

Then, we reboot the sytem, the kernel will crash at
drivers/video/omap2/dss/core.c:323

This is because the panel is closed twice. Now check the state of a dssdev
to forbid a panel is power on or power off twice.

Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays/panel-acx565akm.c b/drivers/video/omap2/displays/panel-acx565akm.c
index 07fbb8a733b..e7731065320 100644
--- a/drivers/video/omap2/displays/panel-acx565akm.c
+++ b/drivers/video/omap2/displays/panel-acx565akm.c
@@ -587,6 +587,9 @@ static int acx_panel_power_on(struct omap_dss_device *dssdev)
 
         dev_dbg(&dssdev->dev, "%s\n", __func__);
 
+        if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
+                return 0;
+
         mutex_lock(&md->mutex);
 
         r = omapdss_sdi_display_enable(dssdev);
@@ -644,6 +647,9 @@ static void acx_panel_power_off(struct omap_dss_device *dssdev)
 
         dev_dbg(&dssdev->dev, "%s\n", __func__);
 
+        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+                return;
+
         mutex_lock(&md->mutex);
 
         if (!md->enabled) {