Improved CPU frequency control.

The maximum frequency for applications was set to 430 MHz before,
while some Dingoos can handle higher frequencies. Now the limit is set to
the theoretical maximum frequency of 500 MHz.

For the menu itself the maximum frequency is set to a safer 408 MHz,
to avoid over-eager users from putting their system in an unusable state
that is difficult to recover from.

Also the frequency settings are now done in 24 MHz increments, to match
the limitations of the current JZ4740 kernel. Note that only new entries
are rounded to 24 MHz multiples, existing entries stay as they are.

src/gmenu2x.cpp

@@ -209,6 +209,27 @@ int main(int /*argc*/, char * /*argv*/[]) {
 	return 0;
 }
 
+void GMenu2X::initCPULimits() {
+	// Note: These values are for the Dingoo.
+	//       The NanoNote does not have cpufreq enabled in its kernel and
+	//       other devices are not actively maintained.
+	// TODO: Read min and max from sysfs.
+	cpuFreqMin = 30;
+	cpuFreqMax = 500;
+	cpuFreqSafeMax = 420;
+	cpuFreqMenuDefault = 200;
+	cpuFreqAppDefault = 384;
+	cpuFreqMultiple = 24;
+
+	// Round min and max values to the specified multiple.
+	cpuFreqMin = ((cpuFreqMin + cpuFreqMultiple - 1) / cpuFreqMultiple)
+			* cpuFreqMultiple;
+	cpuFreqMax = (cpuFreqMax / cpuFreqMultiple) * cpuFreqMultiple;
+	cpuFreqSafeMax = (cpuFreqSafeMax / cpuFreqMultiple) * cpuFreqMultiple;
+	cpuFreqMenuDefault = (cpuFreqMenuDefault / cpuFreqMultiple) * cpuFreqMultiple;
+	cpuFreqAppDefault = (cpuFreqAppDefault / cpuFreqMultiple) * cpuFreqMultiple;
+}
+
 void GMenu2X::init() {
 #ifdef PLATFORM_GP2X
 /*	gp2x_mem = open("/dev/mem", O_RDWR);
@@ -303,6 +324,7 @@ GMenu2X::GMenu2X()
 	usbnet = samba = inet = web = false;
 	useSelectionPng = false;
 
+	initCPULimits();
 	//load config data
 	readConfig();
 
@@ -673,8 +695,10 @@ void GMenu2X::readConfig(string conffile) {
 		confStr["skin"] = "Default";
 
 	evalIntConf( &confInt["outputLogs"], 0, 0,1 );
-	evalIntConf( &confInt["maxClock"], 430, 30, 500 );
-	evalIntConf( &confInt["menuClock"], 200, 30, 430 );
+	evalIntConf( &confInt["maxClock"],
+				 cpuFreqSafeMax, cpuFreqMin, cpuFreqMax );
+	evalIntConf( &confInt["menuClock"],
+				 cpuFreqMenuDefault, cpuFreqMin, cpuFreqSafeMax );
 	evalIntConf( &confInt["globalVolume"], 67, 0,100 );
 	evalIntConf( &confInt["backlightTimeout"], 15, 0,120 );
 	evalIntConf( &confInt["backlight"], 100, 5,100 );
@@ -1221,7 +1245,7 @@ void GMenu2X::explorer() {
 		string command = cmdclean(fd.getPath()+"/"+fd.getFile());
 		chdir(fd.getPath().c_str());
 		quit();
-		setClock(200);
+		setClock(cpuFreqAppDefault);
 		execlp("/bin/sh","/bin/sh","-c",command.c_str(),NULL);
 
 		//if execution continues then something went wrong and as we already called SDL_Quit we cannot continue
@@ -1254,8 +1278,8 @@ void GMenu2X::options() {
 	SettingsDialog sd(this, input, ts, tr["Settings"]);
 	sd.addSetting(new MenuSettingMultiString(this,tr["Language"],tr["Set the language used by GMenu2X"],&lang,&fl_tr.getFiles()));
 	sd.addSetting(new MenuSettingBool(this,tr["Save last selection"],tr["Save the last selected link and section on exit"],&confInt["saveSelection"]));
-	sd.addSetting(new MenuSettingInt(this,tr["Clock for GMenu2X"],tr["Set the cpu working frequency when running GMenu2X"],&confInt["menuClock"],200,430));
-	sd.addSetting(new MenuSettingInt(this,tr["Maximum overclock"],tr["Set the maximum overclock for launching links"],&confInt["maxClock"],200,430));
+	sd.addSetting(new MenuSettingInt(this,tr["Clock for GMenu2X"],tr["Set the cpu working frequency when running GMenu2X"],&confInt["menuClock"],cpuFreqMin,cpuFreqSafeMax,cpuFreqMultiple));
+	sd.addSetting(new MenuSettingInt(this,tr["Maximum overclock"],tr["Set the maximum overclock for launching links"],&confInt["maxClock"],cpuFreqMin,cpuFreqMax,cpuFreqMultiple));
 	sd.addSetting(new MenuSettingInt(this,tr["Global Volume"],tr["Set the default volume for the gp2x soundcard"],&confInt["globalVolume"],0,100));
 	sd.addSetting(new MenuSettingBool(this,tr["Output logs"],tr["Logs the output of the links. Use the Log Viewer to read them."],&confInt["outputLogs"]));
 	//G
@@ -1666,7 +1690,7 @@ void GMenu2X::editLink() {
 	sd.addSetting(new MenuSettingMultiString(this,tr["Section"],tr["The section this link belongs to"],&newSection,&menu->getSections()));
 	sd.addSetting(new MenuSettingImage(this,tr["Icon"],tr.translate("Select an icon for the link: $1",linkTitle.c_str(),NULL),&linkIcon,".png,.bmp,.jpg,.jpeg"));
 	sd.addSetting(new MenuSettingFile(this,tr["Manual"],tr["Select a graphic/textual manual or a readme"],&linkManual,".man.png,.txt"));
-	sd.addSetting(new MenuSettingInt(this,tr["Clock (default: 336)"],tr["Cpu clock frequency to set when launching this link"],&linkClock,200,confInt["maxClock"]));
+	sd.addSetting(new MenuSettingInt(this,tr["Clock (default: 336)"],tr["Cpu clock frequency to set when launching this link"],&linkClock,cpuFreqMin,confInt["maxClock"],cpuFreqMultiple));
 //	sd.addSetting(new MenuSettingBool(this,tr["Tweak RAM Timings"],tr["This usually speeds up the application at the cost of stability"],&linkUseRamTimings));
 	sd.addSetting(new MenuSettingInt(this,tr["Volume (default: -1)"],tr["Volume to set for this link"],&linkVolume,-1,100));
 	sd.addSetting(new MenuSettingInt(this,tr["Backlight (default: -1)"],tr["LCD backlight value to set when launching this link"],&linkBacklight,-1,100));
@@ -1821,7 +1845,7 @@ void GMenu2X::scanner() {
 #ifdef PLATFORM_PANDORA
 	//char *configpath = pnd_conf_query_searchpath();
 #else
-	if (confInt["menuClock"]<430) {
+	if (confInt["menuClock"]<336) {
 		setClock(336);
 		scanbg.write(font,tr["Raising cpu clock to 336Mhz"],5,lineY);
 		scanbg.blit(s,0,0);
@@ -1889,7 +1913,7 @@ void GMenu2X::scanner() {
 	s->flip();
 	lineY += 26;
 
-	if (confInt["menuClock"]<430) {
+	if (confInt["menuClock"]<336) {
 		setClock(confInt["menuClock"]);
 		scanbg.write(font,tr["Decreasing cpu clock"],5,lineY);
 		scanbg.blit(s,0,0);

src/gmenu2x.h

@@ -106,6 +106,12 @@ private:
 	unsigned short cpuX; //!< Offset for displaying cpu clock information
 	unsigned short volumeX; //!< Offset for displaying volume level
 	unsigned short manualX; //!< Offset for displaying the manual indicator in the taskbar
+	unsigned cpuFreqMin; //!< Minimum CPU frequency
+	unsigned cpuFreqMax; //!< Maximum theoretical CPU frequency
+	unsigned cpuFreqSafeMax; //!< Maximum safe CPU frequency
+	unsigned cpuFreqMenuDefault; //!< Default CPU frequency for gmenu2x
+	unsigned cpuFreqAppDefault; //!< Default CPU frequency for launched apps
+	unsigned cpuFreqMultiple; //!< All valid CPU frequencies are a multiple of this
 	/*!
 	Reads the current battery state and returns a number representing it's level of charge
 	@return A number representing battery charge. 0 means fully discharged. 5 means fully charged. 6 represents a gp2x using AC power.
@@ -156,6 +162,7 @@ private:
 
 	void tvout_on(bool pal);
 	void tvout_off();
+	void initCPULimits();
 	void init();
 	void deinit();
 	void toggleTvOut();

src/menusettingint.cpp

@@ -27,7 +27,7 @@ using std::string;
 using std::stringstream;
 using fastdelegate::MakeDelegate;
 
-MenuSettingInt::MenuSettingInt(GMenu2X *gmenu2x, const string &name, const string &description, int *value, int min, int max)
+MenuSettingInt::MenuSettingInt(GMenu2X *gmenu2x, const string &name, const string &description, int *value, int min, int max, int increment)
 	: MenuSetting(gmenu2x,name,description)
 {
 	IconButton *btn;
@@ -36,6 +36,7 @@ MenuSettingInt::MenuSettingInt(GMenu2X *gmenu2x, const string &name, const strin
 	originalValue = *value;
 	this->min = min;
 	this->max = max;
+	this->increment = increment;
 	setValue(this->value());
 
 	//Delegates
@@ -75,10 +76,10 @@ bool MenuSettingInt::manageInput(bevent_t *event)
             inc();
             break;
         case ALTLEFT:
-            setValue(value() - 10);
+            setValue(value() - 10 * increment);
             break;
         case ALTRIGHT:
-            setValue(value() + 10);
+            setValue(value() + 10 * increment);
             break;
         default:
 			return false;
@@ -88,12 +89,12 @@ bool MenuSettingInt::manageInput(bevent_t *event)
 
 void MenuSettingInt::inc()
 {
-	setValue(value() + 1);
+	setValue(value() + increment);
 }
 
 void MenuSettingInt::dec()
 {
-	setValue(value() - 1);
+	setValue(value() - increment);
 }
 
 void MenuSettingInt::setValue(int value)

src/menusettingint.h

@@ -29,6 +29,7 @@ private:
 	int *_value;
 	std::string strvalue;
 	int min, max;
+	int increment;
 
 	void inc();
 	void dec();
@@ -36,7 +37,8 @@ private:
 public:
 	MenuSettingInt(
 			GMenu2X *gmenu2x, const std::string &name,
-			const std::string &description, int *value, int min, int max);
+			const std::string &description, int *value, int min, int max,
+			int increment = 1);
 	virtual ~MenuSettingInt() {}
 
 	virtual bool manageInput(bevent_t *event);