linux-kernel - Re: [PATCH v2] rtc: zynqmp: Clear alarm interrupt status before interrupt enable

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Message-ID: <20200212112342.GC3326@piout.net>
Date:   Wed, 12 Feb 2020 12:23:42 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Srinivas Neeli <srinivas.neeli@...inx.com>
Cc:     a.zummo@...ertech.it, michal.simek@...inx.com, sgoud@...inx.com,
        shubhraj@...inx.com, linux-rtc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        git@...inx.com
Subject: Re: [PATCH v2] rtc: zynqmp: Clear alarm interrupt status before
 interrupt enable

On 12/02/2020 15:54:39+0530, Srinivas Neeli wrote:
> Fix multiple occurring interrupts for alarm interrupt. RTC module doesn't
> clear the alarm interrupt status bit immediately after the interrupt is
> triggered.This is due to the sticky nature of the alarm interrupt status
> register. The alarm interrupt status register can be cleared only after
> the second counter outruns the set alarm value. To fix multiple spurious
> interrupts, disable alarm interrupt in the handler and clear the status
> bit before enabling the alarm interrupt.
> 
> Fixes: 11143c19eb57 ("rtc: add xilinx zynqmp rtc driver")
> Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> ---
> Changes in V2:
> Addressed Michal Simek comments
>  - Removed new line in declartion part.
>  - Added new line before return.
> ---
>  drivers/rtc/rtc-zynqmp.c | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)
> 
Applied, thanks.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com