Sansa Connect: Power off LCD to save power

Prevent startup screen flash by properly using AVR LCM functions. Power
off LCD when not needed to improve battery runtime.

Change-Id: I76e3c5c0208774f189fbc6f7d7b3c9e22c062285

bootloader/sansaconnect.c

@@ -239,9 +239,7 @@ void main(void)
     font_init();
     button_init();
 
-#ifdef HAVE_LCD_ENABLE
     lcd_enable(true);
-#endif
     lcd_setfont(FONT_SYSFIXED);
     reset_screen();
     show_logo();
@@ -288,10 +286,12 @@ void main(void)
 
         if (ret > 0)
         {
+            lcd_enable(false);
             system_prepare_fw_start();
 
             kernel_entry = (void*)0x01008000;
             ret = kernel_entry();
+            lcd_enable(true);
             printf("FAILED to boot OF");
         }
     }
@@ -309,10 +309,12 @@ void main(void)
     }
     else
     {
+        lcd_enable(false);
         system_prepare_fw_start();
 
         kernel_entry = (void*) loadbuffer;
         ret = kernel_entry();
+        lcd_enable(true);
         printf("FAILED!");
     }
 

firmware/export/config/sansaconnect.h

@@ -81,9 +81,8 @@
 #define LCD_PIXELFORMAT RGB565 /* rgb565 */
 
 #define HAVE_LCD_ENABLE
-#ifndef BOOTLOADER
 #define HAVE_LCD_SLEEP
-#endif
+#define HAVE_LCD_SHUTDOWN
 
 #define LCD_SLEEP_TIMEOUT (2*HZ)
 

firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c

@@ -857,8 +857,3 @@ bool button_hold(void)
 {
     return hold_switch;
 }
-
-void lcd_enable(bool on)
-{
-    (void)on;
-}

firmware/target/arm/tms320dm320/sansa-connect/backlight-sansaconnect.c

@@ -52,13 +52,12 @@ static void _backlight_write_brightness(int brightness)
 
 void backlight_hw_on(void)
 {
-#ifdef HAVE_LCD_SLEEP
     if (!lcd_active())
     {
         lcd_awake();
         lcd_update();
     }
-#endif
+
     /* set GIO34 as PWM1 */
     IO_GIO_FSEL3 = (IO_GIO_FSEL3 & 0xFFF3) | (1 << 2);
 

firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c

@@ -29,49 +29,98 @@
 #include "lcd.h"
 #include "lcd-target.h"
 #include "avr-sansaconnect.h"
+#include "backlight-target.h"
 
-extern bool lcd_on; /* lcd-memframe.c */
+/* See lcd-memframe.c */
+extern void lcd_set_active(bool active);
+
+static bool lcd_powered;
 
-#if defined(HAVE_LCD_SLEEP)
 void lcd_sleep(void)
 {
-    if (lcd_on)
+    if (lcd_powered)
     {
-        lcd_on = false;
+        lcd_set_active(false);
 
-        avr_hid_lcm_sleep();
-        sleep(HZ/20);
+        avr_hid_lcm_power_off();
+        mdelay(100);
 
+        /* Disable OSD window */
+        bitclr16(&IO_OSD_OSDWINMD0, 0x01);
         /* disable video encoder */
-        bitclr16(&IO_VID_ENC_VMOD, 0x01);
+        bitclr16(&IO_VID_ENC_VMOD, VENC_VMOD_VENC);
+        mdelay(66);
 
-        sleep(HZ/20);
+        /* disable video encoder and OSD clocks */
+        bitclr16(&IO_CLK_MOD1, CLK_MOD1_VENC | CLK_MOD1_OSD);
 
-        /* disable video encoder clock */
-        bitclr16(&IO_CLK_MOD1, CLK_MOD1_VENC);
+        lcd_powered = false;
     }
 }
 
 void lcd_awake(void)
 {
-    if (!lcd_on)
+    if (!lcd_powered)
     {
-        lcd_on = true;
-
-        /* enable video encoder clock */
-        bitset16(&IO_CLK_MOD1, CLK_MOD1_VENC); 
-
-        /* enable video encoder */
-        bitset16(&IO_VID_ENC_VMOD, 0x01);
+        /* Enable Video Encoder and OSD clocks */
+        bitset16(&IO_CLK_MOD1, CLK_MOD1_VENC | CLK_MOD1_OSD);
+        /* Enable OSD window */
+        bitset16(&IO_OSD_OSDWINMD0, 0x01);
+        /* Enable video encoder */
+        bitset16(&IO_VID_ENC_VMOD, VENC_VMOD_VENC);
 
+        avr_hid_lcm_power_on();
+        lcd_set_active(true);
         avr_hid_lcm_wake();
 
+        lcd_powered = true;
         send_event(LCD_EVENT_ACTIVATION, NULL);
+    }
+}
 
-        lcd_update();
+void lcd_shutdown(void)
+{
+    backlight_hw_off();
+    lcd_sleep();
+}
+
+void lcd_enable(bool enable)
+{
+    if (lcd_active() == enable)
+        return;
+
+    lcd_set_active(enable);
+
+    if (enable)
+    {
+        /* Enable Video Encoder and OSD clocks */
+        bitset16(&IO_CLK_MOD1, CLK_MOD1_VENC | CLK_MOD1_OSD);
+        /* Enable OSD window */
+        bitset16(&IO_OSD_OSDWINMD0, 0x01);
+        /* Enable video encoder */
+        bitset16(&IO_VID_ENC_VMOD, VENC_VMOD_VENC);
+
+        avr_hid_lcm_wake();
+        mdelay(30);
+
+        send_event(LCD_EVENT_ACTIVATION, NULL);
+    }
+    else
+    {
+        mdelay(30);
+        avr_hid_lcm_sleep();
+        mdelay(10);
+
+        /* Disable OSD window */
+        bitclr16(&IO_OSD_OSDWINMD0, 0x01);
+        /* disable video encoder */
+        bitclr16(&IO_VID_ENC_VMOD, VENC_VMOD_VENC);
+        mdelay(66);
+
+        /* disable video encoder and OSD clocks */
+        bitclr16(&IO_CLK_MOD1, CLK_MOD1_VENC | CLK_MOD1_OSD);
     }
 }
-#endif
 
 void lcd_init_device(void)
 {
@@ -121,10 +170,9 @@ void lcd_init_device(void)
     IO_VID_ENC_VMOD = 0x2015; /* OF sets 0x2011 */
 
     /* Copy Rockbox frame buffer to the second framebuffer */
+    lcd_set_active(true);
     lcd_update();
 
-    avr_hid_lcm_power_on();
-
     /* set framebuffer address - OF sets RAM start address to 0x1000000 */
     addr = ((int)FRAME-CONFIG_SDRAM_START)/32;
 
@@ -149,8 +197,9 @@ void lcd_init_device(void)
 
     /* Enable Video Encoder - RGB666, custom timing */
     IO_VID_ENC_VMOD = 0x2015;
+
+    lcd_powered = true;
     avr_hid_lcm_wake();
-    lcd_on = true;
 }
 
 #ifdef LCD_USE_DMA
@@ -246,7 +295,7 @@ void lcd_update_rect(int x, int y, int width, int height)
         __attribute__ ((section(".icode")));
 void lcd_update_rect(int x, int y, int width, int height)
 {
-    if (!lcd_on)
+    if (!lcd_active())
         return;
 
     if ((width | height) < 0)
@@ -270,7 +319,7 @@ void lcd_update_rect(int x, int y, int width, int height)
 void lcd_update(void) __attribute__ ((section(".icode")));
 void lcd_update(void)
 {
-    if (!lcd_on)
+    if (!lcd_active())
         return;
 
     lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);