From: Grant Likely <grant.likely@secretlab.ca>
To: Felix Radensky <felix@embedded-sol.com>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
Subject: Re: Handling multiple GPIO controllers in 8xxx GPIO driver
Date: Tue, 27 Sep 2011 12:29:12 -0600 [thread overview]
Message-ID: <20110927182912.GA3994@ponder.secretlab.ca> (raw)
In-Reply-To: <4E81D6C0.3010201@embedded-sol.com>
On Tue, Sep 27, 2011 at 04:59:28PM +0300, Felix Radensky wrote:
> Hi,
>
> Looks like 8xxx GPIO driver cannot properly handle interrupts
> when multiple GPIO controllers exist in the system.
>
> On Freescale P1022 there are 3 GPIO controllers. All 3 use
> the same interrupt line, internal interrupt 31. If all controllers
> are defined in device tree set_irq_chained_handler() is invoked
> 3 times with same hardware irq number. The result is interrupt
> storm, mpc8xxx_gpio_irq_cascade() is invoked indefinitely.
>
> What would be the best way to fix the problem ?
The solution is to make the gpio driver register as a regular
interrupt handler, and not as a chained handler.
g.
next prev parent reply other threads:[~2011-09-27 21:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-27 13:59 Handling multiple GPIO controllers in 8xxx GPIO driver Felix Radensky
2011-09-27 18:29 ` Grant Likely [this message]
2011-09-27 22:07 ` Felix Radensky
2011-09-28 20:52 ` Tabi Timur-B04825
2011-09-29 17:27 ` Grant Likely
2011-09-29 20:22 ` Tabi Timur-B04825
2011-09-29 21:36 ` Grant Likely
2011-09-29 20:44 ` Felix Radensky
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