I am still trying to find my way thru the codebase in GIT; but here is what I can suggest based on similar problem diagnosed (still under test) on the OMAP3EVM: 1) Save/restore the GPIO_IRQENABLE1, GPIO_IRQENABLE2 2) Save/restore the GPIO_IRQSTATUS1, GPIO_IRQSTATUS2 This needs to be done before entering (or leaving) deeper C-states. Hope this helps. Best regards, Sanjeev -----Original Message----- From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Högander Jouni Sent: Monday, July 07, 2008 3:27 PM To: Kalle Jokiniemi Cc: Nayak, Rajendra; 'Peter 'p2' De Schrijver'; linux-omap@xxxxxxxxxxxxxxx Subject: Re: [PATCH 00/11] OMAP3 CPUidle patches Kalle Jokiniemi <ext-kalle.jokiniemi@xxxxxxxxx> writes: > On pe, 2008-07-04 at 15:15 +0530, ext Rajendra Nayak wrote: > ... >> > ext Högander Jouni <jouni.hogander@xxxxxxxxx> writes: > > ... > >> > >> > So Rajendra sent his uImage and it works quite ok what comes to off >> > mode on my sdp board. I still see problems with serial console >> > (slow) and on boot I need to generate manually interrupts to get it >> > to boot. Otherwise board hangs at this point: >> >> Yes, I noticed this as well. It takes quite long to bootup if you >> don't generate UART interrupts. >> After bootup once RET/OFF is hit, it takes a few hits to come out of >> it as IO wakeup is missing. > > Jouni had a theory that the ethernet device could cause this slowness > trouble in the startup, so I investigated the matter a little further. > By enabling the debug prints in the ethernet chip driver, > > diff --git a/drivers/net/smc91x.c b/drivers/net/smc91x.c index > 776c81d..7d1eead 100644 > --- a/drivers/net/smc91x.c > +++ b/drivers/net/smc91x.c > @@ -62,7 +62,7 @@ static const char version[] = > > /* Debugging level */ > #ifndef SMC_DEBUG > -#define SMC_DEBUG 0 > +#define SMC_DEBUG 1 > #endif > > > I was able to see, that we get lots of RX overrun interrupts with > cpu_idle, meaning that incoming stuff is not getting processed. By > generating UART interrupts, I we probably can also catch more network > RX interrupts and this helps the bootup go faster. With cpu_idle > disabled, there were no RX overruns. Your investigation supports this theory. Interrupt line from eth chip doesn't wake up mpu. I assume it is gpio line. Those are added to mpu wake-up events group, gpio wake-ups are enabled and mpu peripherals group wake-up event interrupt is enabled. I'm suspecting that this problem happens if state where mpu is in sleep state and core+per are awake is used. Any comments from TI people what might be wrong? > > I'll try to see if this can be fixed somehow. > >> >> > >> > eth0: link up >> > Sending DHCP requests ., OK >> > IP-Config: Got DHCP answer from 0.0.0.0, my address is >> > 192.168.2.101 >> > IP-Config: Complete: >> > device=eth0, addr=192.168.2.101, mask=255.255.255.0, >> > gw=192.168.2.1, >> > host=192.168.2.101, domain=ntc.nokia.com, nis-domain=(none), >> > bootserver=0.0.0.0, rootserver=172.22.146.197, rootpath= >> > Looking up port of RPC 100003/2 on 172.22.146.197 Looking up port >> > of RPC 100005/1 on 172.22.146.197 >> > VFS: Mounted root (nfs filesystem). >> > Freeing init memory: 108K >> > >> > Rajendra, are you still using .config file you sent to me? Are all >> > the changes in your tree available in l-o list. >> >> Yes, all the changes are part of the 11 patch set + 1 rework fixes patch I sent. >> To debug further, can you put a few prints in omap3_enter_idle and >> omap3_enter_idle_bm to see what states are selected by the menu gov. >> We will then know if CORE RET/OFF is attempted but not achieved due >> to some reason, or never attempted altogether. > > My setup does not seem to go beyond C2 state, btw. So I'll need to > debug that also a bit. The above-mentioned patches are applied. > > Br, Kalle > > > ... > > > -- Jouni Högander -- 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 ��.n��������+%������w��{.n�����{�������ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
