As3525 v1/v2 Add power savings menu

Allow user to select cpu undervolt

There have been quite a few issues across the SANSA AMS line related
to CPU undervolting while most players show greatly increased runtime
some crash.
Rather than constanly upping the voltage we now have a
setting with a safe value for all players and the option for lower voltages

I plan to add a few other options here later such as disk
timings and maybe some other clocks/experimental settings

Added: Disk Low speed option for AS3525v2 devices cuts
	frequency to 12 MHz from 24 MHz
Added: Disk Low speed option for AS3525v1 devices cuts
        frequency to 15.5 MHz from 31 MHz

Added: I2c Low Speed AS3525 devices, should be bigger improvement for v1 devices

Fixed: Debug menu for AS3525v2 No SDSLOT frequency,
	Showed IDE freq though it is unused

Added: DBOP and SSP underclocking affects display on v1/v2 respectively

Fixed: debug menu now has SSP frequency, and SSP_CPSR

Update: made settings menu more generic

Update: cleaned up code

Added: Clip v1 & Fuze v1 didn't have HAVE_ADJUSTABLE_CPU_VOLTAGE.
	not sure why but,  waiting on testing to confirm

Added: C200v2 and E200v2 devices and HAVE_ADJUSTABLE_CPU_VOLTAGE.

Fixed: v1 devices don't like display timing set lower (dbop)
       v1 devices don't have a divider set for ssp (causes divide by 0)

Fixed: ClipZip display lags with Max SSP divider changed from 0xFE to 0x32

Fixed: v1 devices didn't work properly with highspeed sd cards
	Added code from http://gerrit.rockbox.org/r/#/c/1704/
	Added powersave and IDE interface enable/disable

Added: V2 devices now have powersave enabled on sd interface

Update: cleaned up code, lang defines, added manual entries

Update ssp clock mechanism added calculated ssp divider to clipzip

Update turn display clock off when clip+ turns off display

Fixed: clipzip wrong register for SSP clock

Change-Id: I04137682243be92f0f8d8bf1cfa54fbb1965559b
TODO: add other players?

1 files changed, 24 insertions, 0 deletions

diff --git a/manual/configure_rockbox/system_options.tex b/manual/configure_rockbox/system_options.tex
index ff2967cec7..b279308e71 100755
--- a/manual/configure_rockbox/system_options.tex
+++ b/manual/configure_rockbox/system_options.tex
@@ -297,6 +297,30 @@ therefore result in better runtime.
         \end{description}
 } %\nopt{HAS_BUTTON_HOLD}
 
+\opt{CONFIG_POWER_SAVING}{
+  \subsection{Power Saving}
+    These options allow users to increase runtime by lowering performance
+    of select subsystems. Certain options may \emph{not} be applicable to your
+    \dap{} or may cause undesired operation to your particular use case.
+
+    \emph{WARNING!} While every effort has been made to ensure the safety of these
+    options, due to manufacturing variance some options may cause unwanted side
+    effects, cause the \dap{} to crash or (while unlikely) even \emph{destroy}
+    your \dap{}. \emph{PROCEED WITH CAUTION}
+
+        \begin{description}
+
+        \item[CPU]
+        Allows lower voltages or cpu speed when enabled.
+        \item[Disk]
+        Allows slower disk operations when enabled.
+        \item[I2C]
+        Allows slower clocking of I2C device bus when enabled.
+        \item[Display]
+        Allows slower screen refresh rates when enabled.
+
+        \end{description}
+} %\opt{CONFIG_POWER_SAVING}
 
 \opt{usb_hid}{
   \subsection{\label{ref:USB_HID}USB HID}