linux-kernel - [PATCH v2 1/3] drm/panel: Use backlight helper

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Message-Id: <20220616172316.1355133-2-steve@sk2.org>
Date:   Thu, 16 Jun 2022 19:23:13 +0200
From:   Stephen Kitt <steve@....org>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     Daniel Thompson <daniel.thompson@...aro.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Stephen Kitt <steve@....org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] drm/panel: Use backlight helper

backlight_properties.fb_blank is deprecated. The states it represents
are handled by other properties; but instead of accessing those
properties directly, drivers should use the helpers provided by
backlight.h.

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.

Signed-off-by: Stephen Kitt <steve@....org>
Cc: Thierry Reding <thierry.reding@...il.com>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c b/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
index 44674ebedf59..174ff434bd71 100644
--- a/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
+++ b/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
@@ -215,14 +215,9 @@ static const struct drm_panel_funcs tm5p5_nt35596_panel_funcs = {
 static int tm5p5_nt35596_bl_update_status(struct backlight_device *bl)
 {
 	struct mipi_dsi_device *dsi = bl_get_data(bl);
-	u16 brightness = bl->props.brightness;
+	u16 brightness = backlight_get_brightness(bl);
 	int ret;
 
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
-		brightness = 0;
-
 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 
 	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
-- 
2.30.2