From 5e867cc092605cca02229009f704594ce046bce1 Mon Sep 17 00:00:00 2001
From: mcudev <29890609+mcudev@users.noreply.github.com>
Date: Fri, 10 Nov 2017 14:14:45 -0500
Subject: [PATCH] display: update display_sleep

---
 embed/extmod/modtrezorui/display-stm32.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/embed/extmod/modtrezorui/display-stm32.h b/embed/extmod/modtrezorui/display-stm32.h
index 28a446e77..60f398c30 100644
--- a/embed/extmod/modtrezorui/display-stm32.h
+++ b/embed/extmod/modtrezorui/display-stm32.h
@@ -24,11 +24,12 @@
 
 #define LED_PWM_TIM_PERIOD (10000)
 
-static void __attribute__((unused)) display_sleep(void) {
+static void __attribute__((unused)) display_sleep(void)
+{
 #if DISPLAY_ILI9341V || DISPLAY_ST7789V
-    CMD(0x28); // display off
-    HAL_Delay(20);
-    CMD(0x10); // enter sleep
+    CMD(0x28); // DISPOFF: Display Off
+    CMD(0x10); // SLPIN: Sleep in
+    HAL_Delay(5); // need to wait 5 milliseconds after "sleep in" before sending any new commands
 #endif
 }