From: Alexey Starikovskiy <astarikovskiy@suse.de>
Date: Mon, 3 Sep 2007 12:30:08 +0000 (+0400)
Subject: ACPI: VIDEO: Adjust current level to closest available one.
X-Git-Tag: firefly_0821_release~24751^2~6^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=63f0edfc0b7f8058f9d3f9b572615ec97ae011ba;p=firefly-linux-kernel-4.4.55.git

ACPI: VIDEO: Adjust current level to closest available one.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 83aa41c5c59f..8a60a3d7001c 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1636,9 +1636,20 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
 			  u32 level_current, u32 event)
 {
-	int min, max, min_above, max_below, i, l;
+	int min, max, min_above, max_below, i, l, delta = 255;
 	max = max_below = 0;
 	min = min_above = 255;
+	/* Find closest level to level_current */
+	for (i = 0; i < device->brightness->count; i++) {
+		l = device->brightness->levels[i];
+		if (abs(l - level_current) < abs(delta)) {
+			delta = l - level_current;
+			if (!delta)
+				break;
+		}
+	}
+	/* Ajust level_current to closest available level */
+	level_current += delta;
 	for (i = 0; i < device->brightness->count; i++) {
 		l = device->brightness->levels[i];
 		if (l < min)