linux-kernel - Re: [PATCH v8 2/2] can: m_can: Add hrtimer to generate software interrupt

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] [day] [month] [year] [list]

Message-ID: <CAK4Znzk_9-nsEW16-ue4sSapixTn3UCPqKkj7iBX+Q_GKLUjoQ@mail.gmail.com>
Date:   Thu, 15 Jun 2023 14:02:39 +0200
From:   Hiago Franco <hiagofranco@...il.com>
To:     Judith Mendez <jm@...com>
Cc:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Schuyler Patton <spatton@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Simon Horman <simon.horman@...igine.com>,
        Conor Dooley <conor+dt@...aro.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v8 2/2] can: m_can: Add hrtimer to generate software interrupt

On Wed, May 31, 2023 at 12:51 AM Judith Mendez <jm@...com> wrote:
>
> Introduce timer polling method to MCAN since some SoCs may not
> have M_CAN interrupt routed to A53 Linux and do not have
> interrupt property in device tree M_CAN node.
>
> On AM62x SoC, MCANs on MCU domain do not have hardware interrupt
> routed to A53 Linux, instead they will use timer polling method.
>
> Add an hrtimer to MCAN class device. Each MCAN will have its own
> hrtimer instantiated if there is no hardware interrupt found in
> device tree M_CAN node. The timer will generate a software
> interrupt every 1 ms. In hrtimer callback, we check if there is
> a transaction pending by reading a register, then process by
> calling the isr if there is.
>
> Signed-off-by: Judith Mendez <jm@...com>

Tested-by: Hiago De Franco <hiago.franco@...adex.com> # Toradex Verdin AM62