linux-kernel - [PATCH v2] drm: shmobile: Use backlight helper

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Message-Id: <20220616170821.1348169-1-steve@sk2.org>
Date:   Thu, 16 Jun 2022 19:08:21 +0200
From:   Stephen Kitt <steve@....org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     Stephen Kitt <steve@....org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm: shmobile: Use backlight helper

This started with work on the removal of backlight_properties'
deprecated fb_blank field, much of which can be taken care of by using
helper functions provided by backlight.h instead of directly accessing
fields in backlight_properties. This patch series doesn't involve
fb_blank, but it still seems useful to use helper functions where
appropriate.

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: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org
---
Changes since v1: clarified commit message, this doesn't touch fb_blank
---
 drivers/gpu/drm/shmobile/shmob_drm_backlight.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
index f6628a5ee95f..794573badfe8 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
@@ -18,11 +18,7 @@ static int shmob_drm_backlight_update(struct backlight_device *bdev)
 	struct shmob_drm_connector *scon = bl_get_data(bdev);
 	struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
 	const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
-	int brightness = bdev->props.brightness;
-
-	if (bdev->props.power != FB_BLANK_UNBLANK ||
-	    bdev->props.state & BL_CORE_SUSPENDED)
-		brightness = 0;
+	int brightness = backlight_get_brightness(bdev);
 
 	return bdata->set_brightness(brightness);
 }

base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56
-- 
2.30.2