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DM8148 hangs on When using vpss after resume.

zhichao tan60372
Expert 1015 points

Hello all:

     I want to let my board get into the low power model,according to the refer "DM814x AM387x PM Suspend resume "

methord,I encounter the following problem:

  I run a graphic application and show the graph on the LCD,and

(1)mount -t debugfs debugfs /sys/kernel/debug

(2)echo -n "mem" > /sys/power/state

  then the system coming into the standby model,After I touch the touchscreeen,the system resume,but the LCD can;t show anything,and show:

VPSS_FVID2: contrl event 0x10040018 timeout
VPSS_DCTRL: failed to get node input status
 
If I first stop load-hd-firmware.sh and then stop my graphic application,and then execute:
echo -n "mem" > /sys/power/state
After resuming the system,and start  load-hd-firmware.sh,and start graphic application,all is ok,no erros.
But It wasts lots of time from suspending to resume state.
 
so:
(1)When suspend the system,How to let Cortex-M3 also come  into suspend model?Wheather the fireware bin support the simliar cmmond?
(2)Wheather I can let the LCD(VPSS) still work when execute
echo -n "mem" > /sys/power/state?
And according to :

AM335x Power Management Standby User's Guide

I find that "The firmware running on CM3 is enhanced with commands and wake handlers for achieving standby low-power mode. " and there is newer fireware bin to support suspend model for M3.

Thanks.

        zhichao.