Subject: [PATCH 1/1] Watchdog: OMAP3: fix wrong boot status from wdt reboot

From: [email-masked] (Zumeng Chen)
Date: Thu, 5 Jul 2012 14:00:34 +0800

? 2012?07?05? 13:39, Shubhrajyoti ??:
> Hello,
> On Wednesday 04 July 2012 09:27 PM, zumeng.chen wrote:
>> To: Shubhrajyoti
>> On 2012?07?04? 23:54, Zumeng Chen wrote:
>>> Does the following fix make sense?
> yes , thanks for the patch.
> IIRC Rajendra had a similar one.
> Some comments below.
>>> WDIOC_GETBOOTSTATUS always return 0 even if the machine
>>> comes from omap-wdt reboot. Because WKUP_MOD is not right
>>> for OMAP3,so give the right addr 0xA00 of PRM_RSTST for
>>> get_reset_sources, which inputs the signal from omap-wdt
>>> reboot, and return 1 when coming from omap-wdt reboot for
>>> WDIOC_GETBOOTSTATUS.
>>>
>>> Signed-off-by: Zumeng Chen<[email-masked]>
>>> ---
>>>    arch/arm/mach-omap2/prcm.c  |    4 +++-
>>>    drivers/watchdog/omap_wdt.c |    3 +++
>>>    drivers/watchdog/omap_wdt.h |    3 +++
>>>    3 files changed, 9 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
>>> index 480f40a..43f3feb 100644
>>> --- a/arch/arm/mach-omap2/prcm.c
>>> +++ b/arch/arm/mach-omap2/prcm.c
>>> @@ -49,8 +49,10 @@ void __iomem *prcm_mpu_base;
>>>    u32 omap_prcm_get_reset_sources(void)
>>>    {
>>>        /* XXX This presumably needs modification for 34XX */
>>> -    if (cpu_is_omap24xx() || cpu_is_omap34xx())
>>> +    if (cpu_is_omap24xx())
>>>            return omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST)&
>>> 0x7f;
>>> +    if (cpu_is_omap34xx())
>>> +        return omap2_prm_read_mod_reg(0xA00, OMAP2_RM_RSTST)&   0x7f;
>>>        if (cpu_is_omap44xx())
>>>            return omap2_prm_read_mod_reg(WKUP_MOD, OMAP4_RM_RSTST)&
>>> 0x7f;
>>>
>>> diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
>>> index 8285d65..ea57078 100644
>>> --- a/drivers/watchdog/omap_wdt.c
>>> +++ b/drivers/watchdog/omap_wdt.c
>>> @@ -234,6 +234,9 @@ static long omap_wdt_ioctl(struct file *file,
>>> unsigned int cmd,
>>>            if (cpu_is_omap24xx())
>>>                return put_user(omap_prcm_get_reset_sources(),
>>>                        (int __user *)arg);
>>> +        if (cpu_is_omap34xx())
>>> +            return put_user(omap_prcm_get_reset_sources()&   0x10>>
>>> +                OMAP3_PRM_RSTST_BIT, (int __user *)arg);
> Actually instead of returning yes/no.
> The correct  expectation is to return WDIOF_* flags as defined in
> include/linux/watchdog.h.
Yes, return WDIOF_CARDRESET is more general, thanks.
>
> (BTW I agree that was something even current code is not
> following).Since you are at it may be that?s
> something you can consider.
Yes, I just find them, I'll try it to get it more following, like 
get_status.

Regards,
Zumeng
>
>>>            return put_user(0, (int __user *)arg);
>>>        case WDIOC_KEEPALIVE:
>>>            pm_runtime_get_sync(wdev->dev);
>>> diff --git a/drivers/watchdog/omap_wdt.h b/drivers/watchdog/omap_wdt.h
>>> index 09b774c..d8d5daa 100644
>>> --- a/drivers/watchdog/omap_wdt.h
>>> +++ b/drivers/watchdog/omap_wdt.h
>>> @@ -40,6 +40,9 @@
>>>    #define OMAP_WATCHDOG_WPS        (0x34)
>>>    #define OMAP_WATCHDOG_SPR        (0x48)
>>>
>>> +/* PRM_RSTST MPU_WD_RST bit */
>>> +#define OMAP3_PRM_RSTST_BIT        4
>>> +
>>>    /* Using the prescaler, the OMAP watchdog could go for many
>>>     * months before firing.  These limits work without scaling,
>>>     * with the 60 second default assumed by most tools and docs.