linux-kernel - RE: [PATCH v2 0/9] Intel Keem Bay WDT bug fixes

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Message-ID: <BYAPR11MB312848D2D369C78BD2E969F0F1269@BYAPR11MB3128.namprd11.prod.outlook.com>
Date:   Mon, 24 May 2021 06:06:35 +0000
From:   "Sanil, Shruthi" <shruthi.sanil@...el.com>
To:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "kris.pan@...ux.intel.com" <kris.pan@...ux.intel.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "Thokala, Srikanth" <srikanth.thokala@...el.com>,
        "Raja Subramanian, Lakshmi Bai" 
        <lakshmi.bai.raja.subramanian@...el.com>,
        "Sangannavar, Mallikarjunappa" 
        <mallikarjunappa.sangannavar@...el.com>
Subject: RE: [PATCH v2 0/9] Intel Keem Bay WDT bug fixes

Hi Roeck,

I have addressed your review comments in the v2 version of this patch series.
Could you please review?

If no comments, can I get an Acked-by tag?
Thanks!

Regards,
Shruthi

> -----Original Message-----
> From: Sanil, Shruthi <shruthi.sanil@...el.com>
> Sent: Monday, May 17, 2021 11:20 PM
> To: wim@...ux-watchdog.org; linux@...ck-us.net; linux-
> watchdog@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: andriy.shevchenko@...ux.intel.com; kris.pan@...ux.intel.com;
> mgross@...ux.intel.com; Thokala, Srikanth <srikanth.thokala@...el.com>;
> Raja Subramanian, Lakshmi Bai <lakshmi.bai.raja.subramanian@...el.com>;
> Sangannavar, Mallikarjunappa <mallikarjunappa.sangannavar@...el.com>;
> Sanil, Shruthi <shruthi.sanil@...el.com>
> Subject: [PATCH v2 0/9] Intel Keem Bay WDT bug fixes
> 
> From: Shruthi Sanil <shruthi.sanil@...el.com>
> 
> The series of patches include the below bug fixes in the Intel Keem Bay
> watchdog timer driver:
> 
> Patch 1/9:
> - Update WDT pre-timeout during the initialization
>   The pretimeout register has a default reset value. Hence
>   when a smaller WDT timeout is set which would be lesser than the
>   default pretimeout, the system behaves abnormally, starts
>   triggering the pretimeout interrupt even when the WDT is
>   not enabled, most of the times leading to system crash.
>   Hence an update in the pre-timeout is also required for the
>   default timeout that is being configured.
> 
> Patch 2/9:
> - Upadate WDT pretimeout for every update in timeout
>   The pre-timeout value to be programmed to the register has to be
>   calculated and updated for every change in the timeout value.
>   Else the threshold time wouldn't be calculated to its
>   corresponding timeout.
> 
> Patch 3/9:
> - Update pretimeout to 0 in the TH ISR
>   The pretimeout has to be updated to 0 during the ISR of the
>   ThresHold interrupt. Else the TH interrupt would be triggerred for
>   every tick until the timeout.
> 
> Patch 4/9:
> - Clear either the TO or TH interrupt bit
>   During the interrupt service routine of the TimeOut interrupt and
>   the ThresHold interrupt, the respective interrupt clear bit
>   have to be cleared and not both.
> 
> Patch 5/9:
> - Remove timeout update in the WDT start function
>   Removed set timeout from the start WDT function. There is a function
>   defined to set the timeout. Hence no need to set the timeout again in
>   start function as the timeout would have been already updated
>   before calling the start/enable.
> 
> Patch 6/9:
> - Removed timeout update in the TO ISR
>   In the TO ISR removed updating the Timeout value because
>   its not serving any purpose as the timer would have already expired
>   and the system would be rebooting.
> 
> Patch 7/9:
> - MACRO for WDT enable and disable values
>   Introduced MACRO's for WDT enable and disable values for better
> readability
> 
> Patch 8/9:
> - WDT SMC handler MACRO name update
>   Updated the WDT SMC handler MACRO name to make it clear that its
>   a ARM SMC handler that helps in clearing the WDT interrupt bit.
> 
> Patch 9/9:
> - Typo corrections and other blank operations
>   Corrected typos, aligned the tabs and added new lines
>   wherever required for better readability
> 
> Changes since v1:
> - Dropped a patch with the incorrect fix
>   regarding the WDT suspend/resume function.
> 
> Shruthi Sanil (9):
>   watchdog: keembay: Update WDT pre-timeout during the initialization
>   watchdog: keembay: Upadate WDT pretimeout for every update in timeout
>   watchdog: keembay: Update pretimeout to zero in the TH ISR
>   watchdog: keembay: Clear either the TO or TH interrupt bit
>   watchdog: keembay: Remove timeout update in the WDT start function
>   watchdog: keembay: Removed timeout update in the TO ISR
>   watchdog: keembay: MACRO for WDT enable and disable values
>   watchdog: keembay: WDT SMC handler MACRO name update
>   watchdog: keembay: Typo corrections and other blank operations
> 
>  drivers/watchdog/keembay_wdt.c | 34 ++++++++++++++++++++++------------
>  1 file changed, 22 insertions(+), 12 deletions(-)
> 
> 
> base-commit: 88b06399c9c766c283e070b022b5ceafa4f63f19
> --
> 2.17.1