hosted: Fix overzealous spamming of backlight and lcd enable

This caused random delays in LCD activity, and also caused key inputs to go nuts

Change-Id: Ie483c86f7461455308f8c5f8999df313521c6b55

1 files changed, 12 insertions, 4 deletions

diff --git a/firmware/target/hosted/backlight-unix.c b/firmware/target/hosted/backlight-unix.c
index 28bda52b20..06da05e487 100644
--- a/firmware/target/hosted/backlight-unix.c
+++ b/firmware/target/hosted/backlight-unix.c
@@ -44,20 +44,28 @@ bool backlight_hw_init(void)
     return true;
 }
 
+static int last_bl = -1;
+
 void backlight_hw_on(void)
 {
+    if (last_bl != 1) {
 #ifdef HAVE_LCD_ENABLE
-    lcd_enable(true);
+        lcd_enable(true);
 #endif
-    sysfs_set_int(sysfs_bl_power, 0);
+        sysfs_set_int(sysfs_bl_power, 0);
+        last_bl = 1;
+    }
 }
 
 void backlight_hw_off(void)
 {
-    sysfs_set_int(sysfs_bl_power, 1);
+    if (last_bl != 0) {
+        sysfs_set_int(sysfs_bl_power, 1);
 #ifdef HAVE_LCD_ENABLE
-    lcd_enable(false);
+        lcd_enable(false);
 #endif
+        last_bl = 0;
+    }
 }
 
 void backlight_hw_brightness(int brightness)