rtc wake up does not work on ASUS M2V-MX SE

[Jiang Wang]

Hi,

I want to use the rtc wake up function on coreboot and Linux on ASUS
M2V MX-SE. I used rtcwake command (ver 2.19)  from
ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/ to automatically
wake up the machine after an S3 sleep. This works well on manufactured
ASUS bios. But with coreboot, it reports an error, "open device
/sys/class/rtc/rtc0/device/power/wakeup failed." It seems the command
try to find /dev/rtc0 but failed. And I checked that device manually;
it does not exist.

Anyone knows why this happened and how to fix it? Thanks!

Regards,

Jiang

[Stefan Reinauer]

* Jiang Wang  [110418 23:38]:
> Hi,
>
> I want to use the rtc wake up function on coreboot and Linux on ASUS
> M2V MX-SE. I used rtcwake command (ver 2.19)  from
> ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/ to automatically
> wake up the machine after an S3 sleep. This works well on manufactured
> ASUS bios. But with coreboot, it reports an error, "open device
> /sys/class/rtc/rtc0/device/power/wakeup failed." It seems the command
> try to find /dev/rtc0 but failed. And I checked that device manually;
> it does not exist.

Sounds like some node is missing in the DSDT?

[Jiang Wang]

Hi Stefan,

Do you have any suggestions about the specific name or keywords that I
should look for in the DSDT? I think I can dump the DSDT of the
manufactured BIOS with acpitool and compare it with the one of
coreboot, right? But it is better to have a rough idea before doing
the comparison. Thanks.

Regards,

Jiang

On Mon, Apr 18, 2011 at 7:08 PM, Stefan Reinauer
 wrote:
> Jiang Wang  [110418 23:38]:
> > Hi,
> >
> > I want to use the rtc wake up function on coreboot and Linux on ASUS
> > M2V MX-SE. I used rtcwake command (ver 2.19)  from
> > ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/ to automatically
> > wake up the machine after an S3 sleep. This works well on manufactured
> > ASUS bios. But with coreboot, it reports an error, "open device
> > /sys/class/rtc/rtc0/device/power/wakeup failed." It seems the command
> > try to find /dev/rtc0 but failed. And I checked that device manually;
> > it does not exist.
>
> Sounds like some node is missing in the DSDT?

[Rudolf Marek]

Hi

I think two things are missing:

1) Paste this into the dsdt table:

Device(RTC0) {
                                         Name(_HID, EISAID("PNP0B00"))   /* AT 
Real Time Clock (not PIIX4 compatible) */
                                         Name(_CRS, ResourceTemplate() {
                                                IRQNoFlags(){8}
                                            IO(Decode16,0x0070, 0x0070, 0, 2)
                                         })
                                 } /* End Device(_SB.PCI0.LpcIsaBr.RTC0) */

Now the RTC device should be visible. Second problem is that a wakeup event is 
not enabled. This can be fixed most likely here:

Index: lpc.c
===================================================================
--- lpc.c	(revision 6474)
+++ lpc.c	(working copy)
@@ -237,6 +237,9 @@
    printk(BIOS_DEBUG, "SLP_TYP type was %x %x\n", tmp, acpi_slp_type);
  #endif

+	/* enable power button wakeup and from RTC */
+	outb(0x5, VT8237R_ACPI_IO_BASE + 0x3);
+
    /* All SMI on, both IDE buses ON, PSON rising edge. */
    outw(0x1, VT8237R_ACPI_IO_BASE + 0x2c);

Completely untested but might even work.
Please let me know if it works for you,

Thanks,
Rudolf

[Fengwei Zhang]

Hi Rudolf,

Thanks for your email. I tried with your way, but the RTC0 device still 
is not visible.
either from /dev/ or /sys/class/ directory.

I also extract DSDT table from Original BIOS,

Device(RTC0)
    {
    Name(_HID, EISAID("PNP0B00"))
    Name(CRS0, ResourceTemplate()
    {
    IO(Decode16, 0x0070, 0x0070, 0x00, 0x02)
    IRQNoFlags() {8}
    })
    Name(CRS1, ResourceTemplate()
    {
    IO(Decode16, 0x0070, 0x0070, 0x00, 0x02)
    })
    Method(_CRS, 0, NotSerialized)
    {
    If(LOr(LEqual(SHTB, Zero), LEqual(^^HPET.SHTS(), Zero)))
    {
    Return(CRS0)
    }
    Return(CRS1)
    }
    }
It looks like same thing you posted in last email. but I cannot compile 
successfully for this one because of some unrecognized symbol of this 
line: LEqual(^^HPET.SHTS(),

I did enable the power button in lpc.c file.

Is there anything else I am missing?

Thanks,
Fengwei

On 04/19/2011 02:24 PM, Rudolf Marek wrote:
> Hi
>
> I think two things are missing:
> Paste this into the dsdt table:
>
> Device(RTC0) {
> Name(_HID, EISAID("PNP0B00")) /* AT Real Time Clock (not PIIX4
> compatible) */
> Name(_CRS, ResourceTemplate() {
> IRQNoFlags(){8}
> IO(Decode16,0x0070, 0x0070, 0, 2)
> })
> } /* End Device(_SB.PCI0.LpcIsaBr.RTC0) */
>
> Now the RTC device should be visible. Second problem is that a wakeup
> event is not enabled. This can be fixed most likely here:
> Index: lpc.c
>
> --- lpc.c (revision 6474)
> +++ lpc.c (working copy)
> @@ -237,6 +237,9 @@
> printk(BIOS_DEBUG, "SLP_TYP type was %x %x\n", tmp, acpi_slp_type);
> #endif
> /* enable power button wakeup and from RTC */
> outb(0x5, VT8237R_ACPI_IO_BASE + 0x3);
>
> /* All SMI on, both IDE buses ON, PSON rising edge. */
> outw(0x1, VT8237R_ACPI_IO_BASE + 0x2c);
>
> Completely untested but might even work.
> Please let me know if it works for you,
>
> Thanks,
> Rudolf