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From: Felix Radensky <felix@embedded-sol.com>
To: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
	"jacmet@sunsite.dk" <jacmet@sunsite.dk>,
	grant.likely@secretlab.ca
Subject: Handling multiple GPIO controllers in 8xxx GPIO driver
Date: Tue, 27 Sep 2011 16:59:28 +0300	[thread overview]
Message-ID: <4E81D6C0.3010201@embedded-sol.com> (raw)

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 ?

Thanks.

Felix Radensky.

             reply	other threads:[~2011-09-27 15:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-27 13:59 Felix Radensky [this message]
2011-09-27 18:29 ` Handling multiple GPIO controllers in 8xxx GPIO driver Grant Likely
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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