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

On Tue, Jun 07, 2022 at 08:20:25PM +0200, Stephen Kitt wrote:
> 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 <steve@sk2.org>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@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);
> }

The brackets can be removed now. Otherwise:

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> -
> - 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
>
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