From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Torin Cooper-Bennun <torin@maxiluxsystems.com>
Cc: linux-can@vger.kernel.org
Subject: Re: [PATCH RFC can-next 0/3] m_can: support device-specific interrupt handling
Date: Fri, 14 May 2021 16:55:56 +0200 [thread overview]
Message-ID: <20210514145556.utpdscudwcidmmcz@pengutronix.de> (raw)
In-Reply-To: <20210514144434.etefrlqq5pwcb34t@bigthink>
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On 14.05.2021 15:44:34, Torin Cooper-Bennun wrote:
> On Fri, May 14, 2021 at 04:12:37PM +0200, Marc Kleine-Budde wrote:
> > > The TCAN4550 has interrupts that cannot be disabled or masked, including
> > > those for faults involving SPI, power, and transceiver issues (e.g. CAN
> > > stuck dominant).
> >
> > Ah, ok. Do they need any handling/acknowledge? You only read TCAN4X5X_INT_FLAGS, are
> > those clear-or-read?
>
> In theory, for any of these, clearing the register should be sufficient
> for the interrupt pin to go inactive... emphasis on "in theory".
Ok, but as you noticed in your patch, if no IRQ is pending in M_CAN_IR,
the main driver doesn't call the tcan4x5x handler.
So the IRQ stays active, the IRQ handler is repeatedly called and
returns IRQ_NONE. Then you get the nobody cared warning.
regards,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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next prev parent reply other threads:[~2021-05-14 14:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 12:19 [PATCH RFC can-next 0/3] m_can: support device-specific interrupt handling Torin Cooper-Bennun
2021-05-14 12:19 ` [PATCH RFC can-next 1/3] can: m_can: add handle_dev_interrupts callback to m_can_ops Torin Cooper-Bennun
2021-05-14 12:26 ` Marc Kleine-Budde
2021-05-14 13:21 ` Torin Cooper-Bennun
2021-05-14 14:16 ` Marc Kleine-Budde
2021-05-14 12:19 ` [PATCH RFC can-next 2/3] can: m_can: m_can_isr(): handle device-specific interrupts Torin Cooper-Bennun
2021-05-14 12:19 ` [PATCH RFC can-next 3/3] can: tcan4x5x: add handle_dev_interrupts callback to ops Torin Cooper-Bennun
2021-05-14 14:10 ` Marc Kleine-Budde
2021-05-14 14:51 ` Torin Cooper-Bennun
2021-05-14 15:15 ` Marc Kleine-Budde
2021-05-14 16:27 ` Torin Cooper-Bennun
2021-05-14 12:34 ` [PATCH RFC can-next 0/3] m_can: support device-specific interrupt handling Marc Kleine-Budde
2021-05-14 13:10 ` Torin Cooper-Bennun
2021-05-14 14:12 ` Marc Kleine-Budde
2021-05-14 14:44 ` Torin Cooper-Bennun
2021-05-14 14:55 ` Marc Kleine-Budde [this message]
2021-05-14 16:46 ` Torin Cooper-Bennun
2021-05-14 14:54 ` Torin Cooper-Bennun
2021-05-14 15:21 ` Marc Kleine-Budde
2021-05-14 16:44 ` Torin Cooper-Bennun
2021-05-14 17:13 ` Marc Kleine-Budde
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