Patch "auxdisplay: ht16k33: Connect backlight to fbdev" has been added to the 4.14-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    auxdisplay: ht16k33: Connect backlight to fbdev

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     auxdisplay-ht16k33-connect-backlight-to-fbdev.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4379dc18caf761ea403c8c6f399dba0fb66fa815
Author: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date:   Tue Oct 19 16:45:08 2021 +0200

    auxdisplay: ht16k33: Connect backlight to fbdev
    
    [ Upstream commit 80f9eb70fd9276938f0a131f76d438021bfd8b34 ]
    
    Currently /sys/class/graphics/fb0/bl_curve is not accessible (-ENODEV),
    as the driver does not connect the backlight to the frame buffer device.
    Fix this moving backlight initialization up, and filling in
    fb_info.bl_dev.
    
    Fixes: 8992da44c6805d53 ("auxdisplay: ht16k33: Driver for LED controller")
    Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
    Reviewed-by: Robin van der Gracht <robin@xxxxxxxxxxx>
    Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index eec69213dad4f..e3c8f355f9a62 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -426,6 +426,33 @@ static int ht16k33_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
+	/* Backlight */
+	memset(&bl_props, 0, sizeof(struct backlight_properties));
+	bl_props.type = BACKLIGHT_RAW;
+	bl_props.max_brightness = MAX_BRIGHTNESS;
+
+	bl = devm_backlight_device_register(&client->dev, DRIVER_NAME"-bl",
+					    &client->dev, priv,
+					    &ht16k33_bl_ops, &bl_props);
+	if (IS_ERR(bl)) {
+		dev_err(&client->dev, "failed to register backlight\n");
+		return PTR_ERR(bl);
+	}
+
+	err = of_property_read_u32(node, "default-brightness-level",
+				   &dft_brightness);
+	if (err) {
+		dft_brightness = MAX_BRIGHTNESS;
+	} else if (dft_brightness > MAX_BRIGHTNESS) {
+		dev_warn(&client->dev,
+			 "invalid default brightness level: %u, using %u\n",
+			 dft_brightness, MAX_BRIGHTNESS);
+		dft_brightness = MAX_BRIGHTNESS;
+	}
+
+	bl->props.brightness = dft_brightness;
+	ht16k33_bl_update_status(bl);
+
 	/* Framebuffer (2 bytes per column) */
 	BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
 	fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
@@ -458,6 +485,7 @@ static int ht16k33_probe(struct i2c_client *client,
 	fbdev->info->screen_size = HT16K33_FB_SIZE;
 	fbdev->info->fix = ht16k33_fb_fix;
 	fbdev->info->var = ht16k33_fb_var;
+	fbdev->info->bl_dev = bl;
 	fbdev->info->pseudo_palette = NULL;
 	fbdev->info->flags = FBINFO_FLAG_DEFAULT;
 	fbdev->info->par = priv;
@@ -470,34 +498,6 @@ static int ht16k33_probe(struct i2c_client *client,
 	if (err)
 		goto err_fbdev_unregister;
 
-	/* Backlight */
-	memset(&bl_props, 0, sizeof(struct backlight_properties));
-	bl_props.type = BACKLIGHT_RAW;
-	bl_props.max_brightness = MAX_BRIGHTNESS;
-
-	bl = devm_backlight_device_register(&client->dev, DRIVER_NAME"-bl",
-					    &client->dev, priv,
-					    &ht16k33_bl_ops, &bl_props);
-	if (IS_ERR(bl)) {
-		dev_err(&client->dev, "failed to register backlight\n");
-		err = PTR_ERR(bl);
-		goto err_fbdev_unregister;
-	}
-
-	err = of_property_read_u32(node, "default-brightness-level",
-				   &dft_brightness);
-	if (err) {
-		dft_brightness = MAX_BRIGHTNESS;
-	} else if (dft_brightness > MAX_BRIGHTNESS) {
-		dev_warn(&client->dev,
-			 "invalid default brightness level: %u, using %u\n",
-			 dft_brightness, MAX_BRIGHTNESS);
-		dft_brightness = MAX_BRIGHTNESS;
-	}
-
-	bl->props.brightness = dft_brightness;
-	ht16k33_bl_update_status(bl);
-
 	ht16k33_fb_queue(priv);
 	return 0;