Re: [PATCH v2 00/20] rtc: omap: fixes and power-off feature

[Johan Hovold <johan@kernel.org>]

On Fri, Oct 24, 2014 at 02:44:42PM -0500, Felipe Balbi wrote:
> On Fri, Oct 24, 2014 at 09:36:55PM +0200, Johan Hovold wrote:
> > On Fri, Oct 24, 2014 at 02:29:48PM -0500, Felipe Balbi wrote:
> > > Hi,
> > > 
> > > On Fri, Oct 24, 2014 at 02:25:40PM -0500, Felipe Balbi wrote:

> > > > with this I always get to "Power off failed -- system halted". If I
> > > > switch to v3.18-rc1 vanilla, then it works. So it's definitely caused by
> > > > your rtc-only patches.
> > 
> > That's expected (see below). It works with v3.18-rc1 vanilla because
> > machine_halt is called instead of machine_power_off as there is no
> > registered power-off handler.
> 
> yeah, that much I figured :-)
> 
> > > ok, so it seems like it takes more than 1 second for things to
> > > propagate. If I increase that mdelay() to 3000, then everything works
> > > fine on my end. I think we should get RMK's input on this 3000ms delay
> > > to machine_power_off(). Should it be generic, or should we add it to our
> > > rtc pm_power_off implementation ?
> > 
> > As I wrote above, we still need a 2-second mdelay in rtc-omap, which I
> > intend to add to the pmic_power_en patch.
> 
> oh, alright then. If you can Cc me, I'll make sure to test that too ;-)

I will. :) Just wanted to see whether Andrew preferred I resend the
whole series or just that one patch first.

The diff is minimal:

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index e74750f00b18..e4f97ad9eb21 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -423,6 +423,8 @@ static void omap_rtc_power_off(void)
        val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
        rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG,
                        val | OMAP_RTC_INTERRUPTS_IT_ALARM2);
+
+       mdelay(2000);
 }

> > The one-second delay is there in machine_power_off to catch most cases
> > which wouldn't take nearly as long as rtc-omap and hence wouldn't be
> > adding an explicit delay in the driver power-off handler.
> 
> alright.

I'll call it a day now. Will keep you posted.

Thanks,
Johan