linux-kernel - Re: [PATCH 9/9] mfd: sec-irq: Do not enforce (incorrect) interrupt trigger type

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <0f1509ef-9ae7-7a77-84b7-360b8f0071c7@samsung.com>
Date:   Fri, 18 Dec 2020 14:25:39 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH 9/9] mfd: sec-irq: Do not enforce (incorrect) interrupt
 trigger type

On 10.12.2020 22:29, Krzysztof Kozlowski wrote:
> Interrupt line can be configured on different hardware in different way,
> even inverted.  Therefore driver should not enforce specific trigger
> type - edge falling - but instead rely on Devicetree to configure it.
>
> The Samsung PMIC drivers are used only on Devicetree boards.
>
> Additionally, the PMIC datasheets describe the interrupt line as active
> low with a requirement of acknowledge from the CPU therefore the edge
> falling is not correct.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

It looks that this together with DTS change fixes RTC alarm failure that 
I've observed from time to time on TM2e board!

> ---
>
> This patch should wait till DTS changes are merged, as it relies on
> proper Devicetree.
> ---
>   drivers/mfd/sec-irq.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/mfd/sec-irq.c b/drivers/mfd/sec-irq.c
> index a98c5d165039..760f88a865ab 100644
> --- a/drivers/mfd/sec-irq.c
> +++ b/drivers/mfd/sec-irq.c
> @@ -480,8 +480,7 @@ int sec_irq_init(struct sec_pmic_dev *sec_pmic)
>   	}
>   
>   	ret = devm_regmap_add_irq_chip(sec_pmic->dev, sec_pmic->regmap_pmic,
> -				       sec_pmic->irq,
> -				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> +				       sec_pmic->irq, IRQF_ONESHOT,
>   				       sec_pmic->irq_base, sec_irq_chip,
>   				       &sec_pmic->irq_data);
>   	if (ret != 0) {

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland