On Thu, Aug 07, 2014 at 09:49:49AM +0200, Javier Martinez Canillas wrote: > Hello Dmitry, > > On 08/07/2014 08:09 AM, Dmitry Torokhov wrote: > >> > >> > irq_of_parse_and_map() already sets up IRQ trigger type based on DT > >> > data, by calling irq_create_of_mapping() which in turn calls > >> > irq_set_irq_type(). > >> > > >> > >> Right but somehow when the IRQ is actually requested the type is overwritten by > >> the value passed to request_threaded_irq() and interrupts are not being > >> generated by the device without this patch. > >> > >> Do you think that this is a bug in the "interrupt-parent" irqchip driver or the > >> IRQ core? I'm not that familiar with the IRQ subsystem. > > > > No, this is clearly driver fault - it smashed previously done setup with new > > flags. > > > > Thanks a lot for the clarification. That was my understanding as well but wanted > to be sure. Actually, I take this back. In mainline everything as it should: if pdata does not specify particular trigger the flags requested end up being IRQF_ONESHOT, which should preserve trigger bits previously set up by the board or OF code. In Chrome kernel we have: /* Default to falling edge if no platform data provided */ irqflags = data->pdata ? data->pdata->irqflags : IRQF_TRIGGER_FALLING; error = request_threaded_irq(client->irq, NULL, mxt_interrupt, irqflags | IRQF_ONESHOT, client->name, data); which I believe should go away. If it is needed on ACPI systems we need to figure out how to do things we can do with OF there. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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