On Tue, Sep 06, 2011 at 09:29:30PM +0530, Santosh Shilimkar wrote:
> TWL6030 devices have an interrupt line which is connected to
> application processor like OMAP. These devices support multiple features
> such as MMC card detect, USB cable detect, RTC interrupt, etc. that must
> wake up the application processor.
>
> With this change, TWL6030 client drivers can make use of
> irq_wake() if the wakeup is desirable on it's irq events.
>
> Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com>
> cc: Samuel Ortiz <sa...@linux.intel.com>
> ---
> drivers/mfd/twl6030-irq.c | 9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
> index eb3b5f8..4477134 100644
> --- a/drivers/mfd/twl6030-irq.c
> +++ b/drivers/mfd/twl6030-irq.c
> @@ -187,6 +187,13 @@ static inline void activate_irq(int irq)
> #endif
> }
>
> +int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
> +{
> + int twl_irq = (int)irq_get_chip_data(d->irq);
> +
> + return irq_set_irq_wake(twl_irq, on);
Note that when running with this previously, LOCKDEP warnings
were seen. LOCKDEP explicitly sets all irq_desc locks as a single
lock-class, causing "possible recursive locking detected" when the TWL
RTC (or other) driver calls through enable_irq_wake to
twl6030_irq_set_wake, which recursively calls irq_set_irq_wake.
Although the irq_desc and lock are different, LOCKDEP treats these as
equivalent, presumably due to problems that can be incurred when
locking more than one irq_desc.
Currently we're running with twl6030_irq_set_wake keeping a count of
sub-module wakeirqs, and setting the wakeup status for the twl_irq
enabled or disabled as needed at suspend time. Can send a patch if
wanted.
> +}
> +
> /*----------------------------------------------------------------------*/
>
> static unsigned twl6030_irq_next;
> @@ -318,10 +325,12 @@ int twl6030_init_irq(int irq_num, unsigned irq_base,
> unsigned irq_end)
> twl6030_irq_chip = dummy_irq_chip;
> twl6030_irq_chip.name = "twl6030";
> twl6030_irq_chip.irq_set_type = NULL;
> + twl6030_irq_chip.irq_set_wake = twl6030_irq_set_wake;
>
> for (i = irq_base; i < irq_end; i++) {
> irq_set_chip_and_handler(i, &twl6030_irq_chip,
> handle_simple_irq);
> + irq_set_chip_data(i, (void *)irq_num);
> activate_irq(i);
> }
>
> --
> 1.7.4.1
>
> --
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