Hi,
* Timo Kokkonen <timo.t.kokko...@iki.fi> [121118 07:15]:
> --- a/drivers/media/rc/ir-rx51.c
> +++ b/drivers/media/rc/ir-rx51.c
> @@ -74,6 +74,19 @@ static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
> OMAP_TIMER_TRIGGER_NONE);
> }
>
> +static void lirc_rx51_stop_tx(struct lirc_rx51 *lirc_rx51)
> +{
> + if (lirc_rx51->wbuf_index < 0)
> + return;
> +
> + lirc_rx51_off(lirc_rx51);
> + lirc_rx51->wbuf_index = -1;
> + omap_dm_timer_stop(lirc_rx51->pwm_timer);
> + omap_dm_timer_stop(lirc_rx51->pulse_timer);
> + omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
> + wake_up(&lirc_rx51->wqueue);
> +}
> +
> static int init_timing_params(struct lirc_rx51 *lirc_rx51)
> {
> u32 load, match;
Good fixes in general.. But you won't be able to access the
omap_dm_timer functions after we enable ARM multiplatform support
for omap2+. That's for v3.9 probably right after v3.8-rc1.
We need to find some Linux generic API to use hardware timers
like this, so I've added Thomas Gleixner and linux-arm-kernel
mailing list to cc.
If no such API is available, then maybe we can export some of
the omap_dm_timer functions if Thomas is OK with that.
The other alternative is to set them up as platform_data
function pointers, but that won't work after we make omap2+
device tree only. And that really just postpones the problem.
Cheers,
Tony
> @@ -163,13 +176,7 @@ static irqreturn_t lirc_rx51_interrupt_handler(int irq,
> void *ptr)
>
> return IRQ_HANDLED;
> end:
> - /* Stop TX here */
> - lirc_rx51_off(lirc_rx51);
> - lirc_rx51->wbuf_index = -1;
> - omap_dm_timer_stop(lirc_rx51->pwm_timer);
> - omap_dm_timer_stop(lirc_rx51->pulse_timer);
> - omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
> - wake_up_interruptible(&lirc_rx51->wqueue);
> + lirc_rx51_stop_tx(lirc_rx51);
>
> return IRQ_HANDLED;
> }
> @@ -249,8 +256,9 @@ static ssize_t lirc_rx51_write(struct file *file, const
> char *buf,
> if ((count > WBUF_LEN) || (count % 2 == 0))
> return -EINVAL;
>
> - /* Wait any pending transfers to finish */
> - wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
> + /* We can have only one transmit at a time */
> + if (lirc_rx51->wbuf_index >= 0)
> + return -EBUSY;
>
> if (copy_from_user(lirc_rx51->wbuf, buf, n))
> return -EFAULT;
> @@ -276,9 +284,18 @@ static ssize_t lirc_rx51_write(struct file *file, const
> char *buf,
>
> /*
> * Don't return back to the userspace until the transfer has
> - * finished
> + * finished. However, we wish to not spend any more than 500ms
> + * in kernel. No IR code TX should ever take that long.
> + */
> + i = wait_event_timeout(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0,
> + HZ / 2);
> +
> + /*
> + * Ensure transmitting has really stopped, even if the timers
> + * went mad or something else happened that caused it still
> + * sending out something.
> */
> - wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
> + lirc_rx51_stop_tx(lirc_rx51);
>
> /* We can sleep again */
> lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1);
> --
> 1.8.0
>
> --
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