iBasso DX50/DX90: User selectable freq scaling governor.

Depends on http://gerrit.rockbox.org/r/#/c/1043/.

This patch adds a new setting in Settings -> General
-> System: Freq Scaling Governor

Usable in Quickscreen and Shortcuts.

Possible settings are:
- Conservative: Slow frequency switching.
- Ondemand or Interactive: Fast frequency switching.
- Powersave: Allways lowest frequency.
- Performance: Allways highest frequency.

German translation provided.

This may be genric for Android kernel based devices but is only enabled
for iBasso Devices. Other maintainers may choose do adopt this.

Change-Id: I10296f5be9586ad3a409105db0cd03682a30e9c1

10 files changed, 232 insertions, 3 deletions

diff --git a/apps/lang/deutsch.lang b/apps/lang/deutsch.lang
index 55377c2..6d9c025 100644
--- a/apps/lang/deutsch.lang
+++ b/apps/lang/deutsch.lang
@@ -33,6 +33,7 @@
 # - Kaspar Rothenfußer
 # - Johannes Linke
 # - Kai Posadowsky
+# - Udo Schläpfer
 <phrase>
   id: LANG_SET_BOOL_YES
   desc: bool true representation
@@ -13054,3 +13055,23 @@
     *: "Beschränke automatischen Verzeichniswechsel"
   </voice>
 </phrase>
+<phrase>
+  id: LANG_IBASSO_FREQ_SCALING_GOVERNOR
+  desc: in Settings -> General -> System -> Freq Scaling Governor
+  user: core
+  <source>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </source>
+  <dest>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </dest>
+  <voice>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </voice>
+</phrase>
diff --git a/apps/lang/english.lang b/apps/lang/english.lang
index ca5e687..081e33d 100644
--- a/apps/lang/english.lang
+++ b/apps/lang/english.lang
@@ -13373,3 +13373,23 @@
     swcodec: "Dry / Wet Mix"
   </voice>
 </phrase>
+<phrase>
+  id: LANG_IBASSO_FREQ_SCALING_GOVERNOR
+  desc: in Settings -> General -> System -> Freq Scaling Governor
+  user: core
+  <source>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </source>
+  <dest>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </dest>
+  <voice>
+    *: none
+    ibassodx50: "Freq Scaling Governor"
+    ibassodx90: "Freq Scaling Governor"
+  </voice>
+</phrase>
diff --git a/apps/menus/settings_menu.c b/apps/menus/settings_menu.c
index 130f5be..6fcc3e9 100644
--- a/apps/menus/settings_menu.c
+++ b/apps/menus/settings_menu.c
@@ -50,6 +50,10 @@
 #endif
 #include "folder_select.h"
 
+#if defined(DX50) || defined(DX90)
+#include "governor-ibasso.h"
+#endif
+
 /***********************************/
 /*    TAGCACHE MENU                */
 #ifdef HAVE_TAGCACHE
@@ -325,6 +329,10 @@ MENUITEM_SETTING(touchpad_deadzone, &global_settings.touchpad_deadzone, NULL);
 MENUITEM_SETTING(shortcuts_replaces_quickscreen, &global_settings.shortcuts_replaces_qs, NULL);
 #endif
 
+#if defined(DX50) || defined(DX90)
+MENUITEM_SETTING(governor, &global_settings.governor, NULL);
+#endif
+
 MAKE_MENU(system_menu, ID2P(LANG_SYSTEM),
           0, Icon_System_menu,
 #if (BATTERY_CAPACITY_INC > 0) || (BATTERY_TYPES_COUNT > 1)
@@ -377,6 +385,10 @@ MAKE_MENU(system_menu, ID2P(LANG_SYSTEM),
 #if defined(USB_ENABLE_STORAGE) && defined(HAVE_MULTIDRIVE)
             &usb_skip_first_drive,
 #endif
+
+#if defined(DX50) || defined(DX90)
+            &governor,
+#endif
          );
 
 /*    SYSTEM MENU                  */
diff --git a/apps/settings.c b/apps/settings.c
index f144a4a..be7b7c3 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -105,6 +105,11 @@ struct system_status global_status;
 #include "lcd-remote.h"
 #endif
 
+#if defined(DX50) || defined(DX90)
+#include "governor-ibasso.h"
+#endif
+
+
 long lasttime = 0;
 
 /** NVRAM stuff, if the target doesnt have NVRAM it is saved in ROCKBOX_DIR /nvram.bin **/
@@ -1081,6 +1086,10 @@ void settings_apply(bool read_disk)
     memcpy(&calibration_parameters, &global_settings.ts_calibration_data, sizeof(struct touchscreen_parameter));
 #endif
 
+#if defined(DX50) || defined(DX90)
+    ibasso_set_governor(global_settings.governor);
+#endif
+
     /* This should stay last */
 #if defined(HAVE_RECORDING) && CONFIG_CODEC == SWCODEC
     enc_global_settings_apply();
diff --git a/apps/settings.h b/apps/settings.h
index 4ea56d2..5d25dc7 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -850,6 +850,10 @@ struct user_settings
     int pbe_precut;
 
     int afr_enabled;
+
+#if defined(DX50) || defined(DX90)
+    int governor;
+#endif
 };
 
 /** global variables **/
diff --git a/apps/settings_list.c b/apps/settings_list.c
index abdb512..2c3f360 100644
--- a/apps/settings_list.c
+++ b/apps/settings_list.c
@@ -62,6 +62,10 @@
 #include "onplay.h"
 #endif
 
+#if defined(DX50) || defined(DX90)
+#include "governor-ibasso.h"
+#endif
+
 #define NVRAM(bytes) (bytes<<F_NVRAM_MASK_SHIFT)
 /** NOTE: NVRAM_CONFIG_VERSION is in settings_list.h
      and you may need to update it if you edit this file */
@@ -2193,6 +2197,22 @@ const struct settings_list settings[] = {
                   NULL, "root menu order",
                   root_menu_load_from_cfg, root_menu_write_to_cfg,
                   root_menu_is_changed, root_menu_set_default),
+
+#if defined(DX50) || defined(DX90)
+    CHOICE_SETTING(0,
+                   governor,
+                   LANG_IBASSO_FREQ_SCALING_GOVERNOR,
+                   GOVERNOR_POWERSAVE,
+                   "freq scaling governor",
+                   "conservative,ondemand,interactive,powersave,performance",
+                   ibasso_set_governor,
+                   5,
+                   "Conservative",
+                   "Ondemand",
+                   "Interactive",
+                   "Powersave",
+                   "Performance"),
+#endif
 };
 
 const int nb_settings = sizeof(settings)/sizeof(*settings);
diff --git a/firmware/SOURCES b/firmware/SOURCES
index a67f866..1bb8563 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -1841,6 +1841,7 @@ target/hosted/ibasso/button-ibasso.c
 #ifdef DEBUG
 target/hosted/ibasso/debug-ibasso.c
 #endif
+target/hosted/ibasso/governor-ibasso.c
 target/hosted/ibasso/hostfs-ibasso.c
 target/hosted/ibasso/lcd-ibasso.c
 target/hosted/ibasso/pcm-ibasso.c
diff --git a/firmware/target/hosted/ibasso/governor-ibasso.c b/firmware/target/hosted/ibasso/governor-ibasso.c
new file mode 100644
index 0000000..b2d3cdf
--- /dev/null
+++ b/firmware/target/hosted/ibasso/governor-ibasso.c
@@ -0,0 +1,90 @@
+/***************************************************************************
+ *             __________               __   ___
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2014 by Ilia Sergachev: Initial Rockbox port to iBasso DX50
+ * Copyright (C) 2014 by Mario Basister: iBasso DX90 port
+ * Copyright (C) 2014 by Simon Rothen: Initial Rockbox repository submission, additional features
+ * Copyright (C) 2014 by Udo Schläpfer: Code clean up, additional features
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+
+#include <stdio.h>
+
+#include "config.h"
+#include "cpufreq-linux.h"
+#include "debug.h"
+
+#include "debug-ibasso.h"
+#include "governor-ibasso.h"
+#include "sysfs-ibasso.h"
+
+
+/* Default governor at boot. */
+static int _last_governor = GOVERNOR_INTERACTIVE;
+
+
+void ibasso_set_governor(int governor)
+{
+    DEBUGF("DEBUG %s: _last_governor: %d, governor: %d.", __func__, _last_governor, governor);
+
+    if(_last_governor != governor)
+    {
+        switch(governor)
+        {
+            case GOVERNOR_CONSERVATIVE:
+            {
+                _last_governor = governor;
+                cpufreq_set_governor("conservative", CPUFREQ_ALL_CPUS);
+                break;
+            }
+
+            case GOVERNOR_ONDEMAND:
+            {
+                _last_governor = governor;
+                cpufreq_set_governor("ondemand", CPUFREQ_ALL_CPUS);
+                break;
+            }
+
+            case GOVERNOR_POWERSAVE:
+            {
+                _last_governor = governor;
+                cpufreq_set_governor("powersave", CPUFREQ_ALL_CPUS);
+                break;
+            }
+
+            case GOVERNOR_INTERACTIVE:
+            {
+                _last_governor = governor;
+                cpufreq_set_governor("interactive", CPUFREQ_ALL_CPUS);
+                break;
+            }
+
+            case GOVERNOR_PERFORMANCE:
+            {
+                _last_governor = governor;
+                cpufreq_set_governor("performance", CPUFREQ_ALL_CPUS);
+                break;
+            }
+
+            default:
+            {
+                DEBUGF("ERROR %s: Unknown governor: %d.", __func__, governor);
+                break;
+            }
+        }
+    }
+}
diff --git a/firmware/target/hosted/ibasso/governor-ibasso.h b/firmware/target/hosted/ibasso/governor-ibasso.h
new file mode 100644
index 0000000..34781fd
--- /dev/null
+++ b/firmware/target/hosted/ibasso/governor-ibasso.h
@@ -0,0 +1,54 @@
+/***************************************************************************
+ *             __________               __   ___
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2014 by Ilia Sergachev: Initial Rockbox port to iBasso DX50
+ * Copyright (C) 2014 by Mario Basister: iBasso DX90 port
+ * Copyright (C) 2014 by Simon Rothen: Initial Rockbox repository submission, additional features
+ * Copyright (C) 2014 by Udo Schläpfer: Code clean up, additional features
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+
+#ifndef _GOVERNOR_IBASSO_H_
+#define _GOVERNOR_IBASSO_H_
+
+
+/* Supported freq scaling governors. */
+enum ibasso_governors
+{
+    /* Slow frequency switching. */
+    GOVERNOR_CONSERVATIVE = 0,
+
+    /* Fast frequency switching. */
+    GOVERNOR_ONDEMAND,
+    GOVERNOR_INTERACTIVE,
+
+    /* Allways lowest frequency. */
+    GOVERNOR_POWERSAVE,
+
+    /* Allways highest frequency. */
+    GOVERNOR_PERFORMANCE
+};
+
+
+/*
+    Set the active freq scaling governor.
+    governor: ibasso_governors
+*/
+void ibasso_set_governor(int governor);
+
+
+#endif
diff --git a/firmware/target/hosted/ibasso/system-ibasso.c b/firmware/target/hosted/ibasso/system-ibasso.c
index 00f8669..a107af7 100644
--- a/firmware/target/hosted/ibasso/system-ibasso.c
+++ b/firmware/target/hosted/ibasso/system-ibasso.c
@@ -27,7 +27,6 @@
 #include <sys/reboot.h>
 
 #include "config.h"
-#include "cpufreq-linux.h"
 #include "debug.h"
 
 #include "button-ibasso.h"
@@ -50,8 +49,7 @@ void system_init(void)
     volatile uintptr_t stack = 0;
     stackbegin = stackend = (uintptr_t*) &stack;
 
-    cpufreq_set_governor("powersave", CPUFREQ_ALL_CPUS);
-    vold_monitor_start();
+	vold_monitor_start();
     ibasso_set_usb_mode(USB_MODE_MASS_STORAGE);
 
     /*