[PATCH] drm/panel: simple: Update backlight state property

[Thierry Reding]

From: Thierry Reding <tred...@nvidia.com>

Some backlight drivers ignore the power property and instead only use
the state property. Fixup the panel driver to set the state property in
addition to the power property.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
Jingoo, Lee,

What's the correct way to do this? Should we update both power and state
properties, or just state? I didn't find code anywhere to keep both in
sync, so it seemed like both needed to be set explicitly.

 drivers/gpu/drm/panel/panel-simple.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c 
b/drivers/gpu/drm/panel/panel-simple.c
index 359cd37d09cb..f503d12b3930 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -168,6 +168,7 @@ static int panel_simple_disable(struct drm_panel *panel)

        if (p->backlight) {
                p->backlight->props.power = FB_BLANK_POWERDOWN;
+               p->backlight->props.state |= BL_CORE_FBBLANK;
                backlight_update_status(p->backlight);
        }

@@ -235,6 +236,7 @@ static int panel_simple_enable(struct drm_panel *panel)
                msleep(p->desc->delay.enable);

        if (p->backlight) {
+               p->backlight->props.state &= ~BL_CORE_FBBLANK;
                p->backlight->props.power = FB_BLANK_UNBLANK;
                backlight_update_status(p->backlight);
        }
-- 
2.8.3