From ad75bd85b1db69c97eefea07b375567821f6ef58 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Tue, 13 Dec 2022 13:29:43 +0100
Subject: [PATCH] platform/x86: sony-laptop: Don't turn off 0x153 keyboard backlight during probe
Git-commit: ad75bd85b1db69c97eefea07b375567821f6ef58
Patch-mainline: v6.2-rc4
References: git-fixes

The 0x153 version of the kbd backlight control SNC handle has no separate
address to probe if the backlight is there.

This turns the probe call into a set keyboard backlight call with a value
of 0 turning off the keyboard backlight.

Skip probing when there is no separate probe address to avoid this.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1583752
Fixes: 800f20170dcf ("Keyboard backlight control for some Vaio Fit models")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mattia Dongili <malattia@linux.it>
Link: https://lore.kernel.org/r/20221213122943.11123-1-hdegoede@redhat.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/platform/x86/sony-laptop.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 7156ae2ad196..537d6a2d0781 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1887,14 +1887,21 @@ static int sony_nc_kbd_backlight_setup(struct platform_device *pd,
 		break;
 	}
 
-	ret = sony_call_snc_handle(handle, probe_base, &result);
-	if (ret)
-		return ret;
+	/*
+	 * Only probe if there is a separate probe_base, otherwise the probe call
+	 * is equivalent to __sony_nc_kbd_backlight_mode_set(0), resulting in
+	 * the keyboard backlight being turned off.
+	 */
+	if (probe_base) {
+		ret = sony_call_snc_handle(handle, probe_base, &result);
+		if (ret)
+			return ret;
 
-	if ((handle == 0x0137 && !(result & 0x02)) ||
-			!(result & 0x01)) {
-		dprintk("no backlight keyboard found\n");
-		return 0;
+		if ((handle == 0x0137 && !(result & 0x02)) ||
+				!(result & 0x01)) {
+			dprintk("no backlight keyboard found\n");
+			return 0;
+		}
 	}
 
 	kbdbl_ctl = kzalloc(sizeof(*kbdbl_ctl), GFP_KERNEL);
-- 
2.35.3