Gigabeat S: Turn off backlight LED supply after a 2-second delay and save a little power. Hardware fading required keeping supply enabled during fade out. Let fade happen at poweroff (might as well~~~).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19322 a1c6a512-1295-4272-9138-f99709370657

firmware/export/config-gigabeat-s.h

@@ -76,9 +76,17 @@
                        SAMPR_CAP_24 | SAMPR_CAP_22 | SAMPR_CAP_16 | \
                        SAMPR_CAP_12 | SAMPR_CAP_11 | SAMPR_CAP_8)
 
+/* Define this if your LCD can be put to sleep. */
+#define HAVE_LCD_SLEEP
+/* We don't use a setting but a fixed delay after the backlight has
+ * turned off */
+#define LCD_SLEEP_TIMEOUT (2*HZ)
+
 #ifndef BOOTLOADER
-/* Not for bootloader */
+#if 0
+/* Define this if your LCD can be enabled/disabled */
 #define HAVE_LCD_ENABLE
+#endif
 
 #define HAVE_BACKLIGHT_BRIGHTNESS
 

firmware/target/arm/imx31/gigabeat-s/backlight-imx31.c

@@ -67,7 +67,7 @@ static const struct
 
 /* Bits always combined with ramping bits */
 #define MC13783_LED_CONTROL0_BITS \
-    (MC13783_LEDEN | MC13783_BOOSTEN | MC13783_ABMODE_MONCH_LEDMD1234 | \
+    (MC13783_BOOSTEN | MC13783_ABMODE_MONCH_LEDMD1234 | \
      MC13783_ABREF_400MV)
 
 static struct mutex backlight_mutex;    /* Block brightness change while
@@ -83,7 +83,8 @@ bool _backlight_init(void)
     mutex_init(&backlight_mutex);
 
     /* Set default LED register value */
-    mc13783_write(MC13783_LED_CONTROL0, MC13783_LED_CONTROL0_BITS);
+    mc13783_write(MC13783_LED_CONTROL0,
+                  MC13783_LED_CONTROL0_BITS | MC13783_LEDEN);
 
 #ifdef HAVE_BACKLIGHT_BRIGHTNESS
     /* Our PWM and I-Level is different than retailos (but same apparent
@@ -125,8 +126,13 @@ void _backlight_on(void)
 
     mutex_lock(&backlight_mutex);
 
-    /* Set/clear LEDRAMPUP bit, clear LEDRAMPDOWN bit */
-    data[0] = MC13783_LED_CONTROL0_BITS;
+#ifdef HAVE_LCD_SLEEP
+    backlight_lcd_sleep_countdown(false); /* stop counter */
+#endif
+
+    /* Set/clear LEDRAMPUP bit, clear LEDRAMPDOWN bit,
+     * Ensure LED supply is on. */
+    data[0] = MC13783_LED_CONTROL0_BITS | MC13783_LEDEN;
 
     if (!backlight_on_status)
         data[0] |= led_ramp_mask & MC13783_LEDMDRAMPUP;
@@ -150,7 +156,7 @@ void _backlight_on(void)
 
 void _backlight_off(void)
 {
-    uint32_t ctrl0 = MC13783_LED_CONTROL0_BITS;
+    uint32_t ctrl0 = MC13783_LED_CONTROL0_BITS | MC13783_LEDEN;
 
     mutex_lock(&backlight_mutex);
 
@@ -169,6 +175,11 @@ void _backlight_off(void)
     mc13783_write_masked(MC13783_LED_CONTROL2, MC13783_LEDMDDCw(0),
                          MC13783_LEDMDDC);
 
+#ifdef HAVE_LCD_SLEEP
+    /* Disable lcd after fade completes (when lcd_sleep timeout expires) */
+    backlight_lcd_sleep_countdown(true); /* start countdown */
+#endif
+
     mutex_unlock(&backlight_mutex);
 }
 
@@ -192,3 +203,15 @@ void _backlight_set_brightness(int brightness)
     mutex_unlock(&backlight_mutex);
 }
 #endif /* HAVE_BACKLIGHT_BRIGHTNESS */
+
+#ifdef HAVE_LCD_SLEEP
+/* Turn off LED supply */
+void _backlight_lcd_sleep(void)
+{
+    mutex_lock(&backlight_mutex);
+
+    mc13783_clear(MC13783_LED_CONTROL0, MC13783_LEDEN);
+
+    mutex_unlock(&backlight_mutex);
+}
+#endif

firmware/target/arm/imx31/gigabeat-s/backlight-target.h

@@ -32,4 +32,6 @@ void _backlight_on(void);
 void _backlight_off(void);
 void _backlight_set_brightness(int brightness);
 
+void _backlight_lcd_sleep(void);
+
 #endif /* BACKLIGHT_TARGET_H */

firmware/target/arm/imx31/gigabeat-s/lcd-imx31.c

@@ -25,6 +25,7 @@
 #include "lcd.h"
 #include "kernel.h"
 #include "lcd-target.h"
+#include "backlight-target.h"
 
 #define LCDADDR(x, y) (&lcd_framebuffer[(y)][(x)])
 
@@ -42,13 +43,6 @@ extern struct viewport* current_vp;
 extern void lcd_copy_buffer_rect(fb_data *dst, const fb_data *src,
                                  int width, int height);
 
-#if 0
-bool lcd_enabled()
-{
-    return lcd_on;
-}
-#endif
-
 /* LCD init */
 void lcd_init_device(void)
 {
@@ -94,6 +88,14 @@ void lcd_update_rect(int x, int y, int width, int height)
     }
 }
 
+#ifdef HAVE_LCD_SLEEP
+void lcd_sleep(void)
+{
+    _backlight_lcd_sleep();
+}
+#endif /* HAVE_LCD_SLEEP */
+
+#if 0
 void lcd_enable(bool state)
 {
     (void)state;
@@ -103,6 +105,7 @@ bool lcd_enabled(void)
 {
     return true;
 }
+#endif
 
 /* Update the display.
    This must be called after all other LCD functions that change the display. */

firmware/target/arm/imx31/gigabeat-s/power-imx31.c

@@ -81,9 +81,18 @@ bool ide_powered(void)
 
 void power_off(void)
 {
+    /* Cut backlight */
+    _backlight_off();
+
+    /* Let it fade */
+    sleep(5*HZ/4);
+
+    /* Set user off mode */
     mc13783_set(MC13783_POWER_CONTROL0, MC13783_USEROFFSPI);
 
+    /* Wait for power cut */
     disable_interrupt(IRQ_FIQ_STATUS);
+
     while (1);
 }