From: "Ayyathurai, Vijayakannan" <vijayakannan.ayyathurai@intel.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: "wim@linux-watchdog.org" <wim@linux-watchdog.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"andriy.shevchenko@linux.intel.com"
<andriy.shevchenko@linux.intel.com>,
"mgross@linux.intel.com" <mgross@linux.intel.com>,
"Wan Mohamad,
Wan Ahmad Zainie" <wan.ahmad.zainie.wan.mohamad@intel.com>,
"Raja Subramanian,
Lakshmi Bai" <lakshmi.bai.raja.subramanian@intel.com>
Subject: RE: [PATCH v3 1/2] watchdog: Add watchdog driver for Intel Keembay Soc
Date: Wed, 2 Dec 2020 14:55:32 +0000 [thread overview]
Message-ID: <DM6PR11MB425005AF05352338BE5403BEFBF30@DM6PR11MB4250.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20201201163044.GA89174@roeck-us.net>
Hi Guenter,
> From: Guenter Roeck <linux@roeck-us.net>
> Sent: Wednesday, 2 December, 2020 12:31 AM
>
> On Tue, Dec 01, 2020 at 11:10:33PM +0800,
> vijayakannan.ayyathurai@intel.com wrote:
> > From: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>
> >
> > Intel Keembay Soc requires watchdog timer support.
> > Add watchdog driver to enable this.
> >
> > +static void keembay_wdt_set_timeout_reg(struct watchdog_device *wdog,
> bool ping)
> > +{
> > + struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
> > + u32 th_val = 0;
> > +
> > + if (!ping && wdog->pretimeout) {
> > + th_val = wdog->timeout - wdog->pretimeout;
> > + keembay_wdt_writel(wdt, TIM_WATCHDOG_INT_THRES, th_val
> * wdt->rate);
>
> Sorry for annoying you now, but I may have found another potential problem.
>
> What happens if the user sets a pretimeout, then removes it ?
> What should TIM_WATCHDOG_INT_THRES be set to in that case ?
> Right now TIM_WATCHDOG_INT_THRES won't be updated anymore
It is a good catch. Indeed, I don't have coverage like this.
> in that case, which seems wrong. This might get worse with
> the following sequence.
>
> - set pretimeout
> - clear pretimeout
> - set timeout to some other value
>
Can the below method resolve this issue?
static int keembay_wdt_set_pretimeout(struct watchdog_device *wdog, u32 t)
{
struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
if(!t)
keembay_wdt_writel(wdt, TIM_WATCHDOG_INT_THRES, 0);
wdog->pretimeout = t;
keembay_wdt_set_timeout_reg(wdog, false);
return 0;
}
> Thanks,
> Guenter
>
Thanks,
Vijay
next prev parent reply other threads:[~2020-12-02 14:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 15:10 [PATCH v3 0/2] Add drivers for Intel Keem Bay SoC watchdog vijayakannan.ayyathurai
2020-12-01 15:10 ` [PATCH v3 1/2] watchdog: Add watchdog driver for Intel Keembay Soc vijayakannan.ayyathurai
2020-12-01 16:30 ` Guenter Roeck
2020-12-02 14:55 ` Ayyathurai, Vijayakannan [this message]
2020-12-02 16:32 ` Guenter Roeck
2020-12-02 17:12 ` Ayyathurai, Vijayakannan
2020-12-01 15:10 ` [PATCH v3 2/2] dt-bindings: watchdog: Add bindings for Intel Keem Bay SoC vijayakannan.ayyathurai
2020-12-01 15:41 ` Ayyathurai, Vijayakannan
2020-12-07 18:23 ` Rob Herring
2020-12-08 2:21 ` Ayyathurai, Vijayakannan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=DM6PR11MB425005AF05352338BE5403BEFBF30@DM6PR11MB4250.namprd11.prod.outlook.com \
--to=vijayakannan.ayyathurai@intel.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=devicetree@vger.kernel.org \
--cc=lakshmi.bai.raja.subramanian@intel.com \
--cc=linux-watchdog@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mgross@linux.intel.com \
--cc=robh+dt@kernel.org \
--cc=wan.ahmad.zainie.wan.mohamad@intel.com \
--cc=wim@linux-watchdog.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).