Kevin, What Silicon Rev does your SDP have? I currently am using an ES3.1 based SDP and I havent seen any of these issues you have reported with off-while-idle. Infact I have kept the board running overnight a couple times in the last week with off-while-idle and voltage scaling to 0v enabled, mainly to test the recent patch set (disabling Auto idle for PER in scratchpad memory) for stability. I will see if I can get hold of an ES3 and ES2.1 based SDP's and see if I reproduce the issue. Besides I use nfs and I am not sure if that's got something to do with it. Will try a ramdisk also. Does it take you a while to reproduce this, or is it seen after the very first UART inactivity? regards, Rajendra >-----Original Message----- >From: linux-omap-owner@xxxxxxxxxxxxxxx >[mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Kevin Hilman >Sent: Wednesday, June 17, 2009 2:35 AM >To: Nayak, Rajendra; Woodruff, Richard >Cc: linux-omap@xxxxxxxxxxxxxxx >Subject: OMAP3 PM: off-mode during idle, problem with UART1 console > >Rajendra, Richard, > >Hoping you can shed some light, or give me some direction on where to >debug this further... > >With the latest PM branch, I've notice that off-while idle isn't >working on the SDP, but the same kernel works fine on the RX51. >RET-while-idle works fine on both. This is with CPUidle disabled, so >just using the default idle where MPU and CORE are changed together. > >More specifically, it seems to be the UART1 (CORE) console that never >comes back from off-while-idle, but the UART3 (PER) console on RX51 >works. > >On SDP, if I > ># echo 1 > /sys/power/enable_off_mode ># echo 1 > /sys/power/voltage_off_while_idle ># echo 1 > /sys/power/sleep_while_idle > >After the UART inactivty timeout of 5 seconds, I start to see the >sys_off_mode LED toggling between red and green with system timer >wakeups. > >If I then push a key on the UART1 console, the LED goes green, stays >for the 5 second UART inactivity and then goes back to toggling >red/green again. However, I never get my console back and never see >the characters on my console. > >If I keep typing, I keep the system from going back off (based on >sys_off_mode LED) and as soon as I stop typing long enough for the >inactivity timer to expiere (5 seconds) it goes back into off. > >Any ideas what's going on here? > >On RX51, the same thing works using UART3. > >Kevin > >-- >To unsubscribe from this list: send the line "unsubscribe >linux-omap" in >the body of a message to majordomo@xxxxxxxxxxxxxxx >More majordomo info at http://vger.kernel.org/majordomo-info.html > >-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
