[PATCH 2/3] drm/panel: panel-dsi-cm: Use backlight helpers

[Stephen Kitt]

Instead of retrieving the backlight brightness in struct
backlight_properties manually, and then checking whether the backlight
should be on at all, use backlight_get_brightness() which does all
this and insulates this from future changes.

Instead of setting the power state by manually updating fields in
struct backlight_properties, use backlight_enable() and
backlight_disable(). These also call backlight_update_status() so the
separate call is no longer needed.

Signed-off-by: Stephen Kitt <st...@sk2.org>
Cc: Thierry Reding <thierry.red...@gmail.com>
Cc: Sam Ravnborg <s...@ravnborg.org>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/gpu/drm/panel/panel-dsi-cm.c | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-dsi-cm.c 
b/drivers/gpu/drm/panel/panel-dsi-cm.c
index b58cb064975f..aa36dc6cedd3 100644
--- a/drivers/gpu/drm/panel/panel-dsi-cm.c
+++ b/drivers/gpu/drm/panel/panel-dsi-cm.c
@@ -86,16 +86,10 @@ static void dsicm_bl_power(struct panel_drv_data *ddata, 
bool enable)
                return;
 
        if (enable) {
-               backlight->props.fb_blank = FB_BLANK_UNBLANK;
-               backlight->props.state = ~(BL_CORE_FBBLANK | BL_CORE_SUSPENDED);
-               backlight->props.power = FB_BLANK_UNBLANK;
+               backlight_enable(backlight);
        } else {
-               backlight->props.fb_blank = FB_BLANK_NORMAL;
-               backlight->props.power = FB_BLANK_POWERDOWN;
-               backlight->props.state |= BL_CORE_FBBLANK | BL_CORE_SUSPENDED;
+               backlight_disable(backlight);
        }
-
-       backlight_update_status(backlight);
 }
 
 static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
@@ -196,13 +190,7 @@ static int dsicm_bl_update_status(struct backlight_device 
*dev)
 {
        struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
        int r = 0;
-       int level;
-
-       if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
-                       dev->props.power == FB_BLANK_UNBLANK)
-               level = dev->props.brightness;
-       else
-               level = 0;
+       int level = backlight_get_brightness(dev);
 
        dev_dbg(&ddata->dsi->dev, "update brightness to %d\n", level);
 
@@ -219,11 +207,7 @@ static int dsicm_bl_update_status(struct backlight_device 
*dev)
 
 static int dsicm_bl_get_intensity(struct backlight_device *dev)
 {
-       if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
-                       dev->props.power == FB_BLANK_UNBLANK)
-               return dev->props.brightness;
-
-       return 0;
+       return backlight_get_brightness(dev);
 }
 
 static const struct backlight_ops dsicm_bl_ops = {
-- 
2.30.2