From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Zubair Lutfullah <zubair.lutfullah@gmail.com> Cc: jic23@cam.ac.uk, dmitry.torokhov@gmail.com, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, Russ.Dill@ti.com Subject: Re: [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and trigger support Date: Mon, 19 Aug 2013 19:12:38 +0200 [thread overview] Message-ID: <20130819171238.GA31610@linutronix.de> (raw) In-Reply-To: <1376424303-22740-5-git-send-email-zubair.lutfullah@gmail.com> * Zubair Lutfullah | 2013-08-13 21:05:03 [+0100]: >diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c >index 3ceac3e..0d7e313 100644 >--- a/drivers/iio/adc/ti_am335x_adc.c >+++ b/drivers/iio/adc/ti_am335x_adc.c … >+static irqreturn_t tiadc_irq(int irq, void *private) >+{ … >+ wake_up_interruptible(&adc_dev->wq_data_avail); … >+} … >+static irqreturn_t tiadc_trigger_h(int irq, void *p) >+{ … >+ schedule_work(&adc_dev->poll_work); … >+} … >+static void tiadc_adc_work(struct work_struct *work_s) >+{ … >+ wait_event_interruptible(adc_dev->wq_data_avail, >+ (adc_dev->data_avail == 1)); … >+} This is not very nice. The problem is that you might sleep in a workqueue and so the other jobs will wait until you are done. I'm think it is better if you create your own worker here instead using the system's. I'm looking into DMA support for this so once your code is working it should be possible to switch to DMA instead reading byte wise from the fifo. How did you test the whole thing? Do you have a test program which selects a few sources and reads them in continuous mode? Sebastian
WARNING: multiple messages have this Message-ID (diff)
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Zubair Lutfullah <zubair.lutfullah@gmail.com> Cc: jic23@cam.ac.uk, dmitry.torokhov@gmail.com, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, Russ.Dill@ti.com Subject: Re: [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and trigger support Date: Mon, 19 Aug 2013 19:12:38 +0200 [thread overview] Message-ID: <20130819171238.GA31610@linutronix.de> (raw) In-Reply-To: <1376424303-22740-5-git-send-email-zubair.lutfullah@gmail.com> * Zubair Lutfullah | 2013-08-13 21:05:03 [+0100]: >diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c >index 3ceac3e..0d7e313 100644 >--- a/drivers/iio/adc/ti_am335x_adc.c >+++ b/drivers/iio/adc/ti_am335x_adc.c … >+static irqreturn_t tiadc_irq(int irq, void *private) >+{ … >+ wake_up_interruptible(&adc_dev->wq_data_avail); … >+} … >+static irqreturn_t tiadc_trigger_h(int irq, void *p) >+{ … >+ schedule_work(&adc_dev->poll_work); … >+} … >+static void tiadc_adc_work(struct work_struct *work_s) >+{ … >+ wait_event_interruptible(adc_dev->wq_data_avail, >+ (adc_dev->data_avail == 1)); … >+} This is not very nice. The problem is that you might sleep in a workqueue and so the other jobs will wait until you are done. I'm think it is better if you create your own worker here instead using the system's. I'm looking into DMA support for this so once your code is working it should be possible to switch to DMA instead reading byte wise from the fifo. How did you test the whole thing? Do you have a test program which selects a few sources and reads them in continuous mode? Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2013-08-19 17:12 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-08-13 20:04 [PATCH 0/4] iio: input: ti_am335x_adc: Add continuous sampling support round 5 Zubair Lutfullah 2013-08-13 20:05 ` [PATCH 1/4] input: ti_am335x_tsc: correct step mask update after IRQ Zubair Lutfullah 2013-08-13 20:05 ` Zubair Lutfullah 2013-08-13 20:05 ` [PATCH 2/4] input: ti_am335x_tsc: Increase sequencer delay time Zubair Lutfullah 2013-08-13 20:05 ` [PATCH 3/4] input: ti_am335x_tsc: Enable shared IRQ for TSC, add overrun and underflow checks Zubair Lutfullah 2013-08-13 20:05 ` Zubair Lutfullah 2013-08-13 20:05 ` [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and trigger support Zubair Lutfullah 2013-08-15 11:43 ` Jonathan Cameron 2013-08-15 11:43 ` Jonathan Cameron 2013-08-16 10:07 ` Sebastian Andrzej Siewior 2013-08-16 10:07 ` Sebastian Andrzej Siewior 2013-08-16 10:17 ` Sebastian Andrzej Siewior 2013-08-16 10:17 ` Sebastian Andrzej Siewior 2013-08-16 11:33 ` Jonathan Cameron 2013-08-16 11:33 ` Jonathan Cameron 2013-08-16 10:46 ` Sebastian Andrzej Siewior 2013-08-16 21:21 ` Zubair Lutfullah : 2013-08-17 8:58 ` Zubair Lutfullah : 2013-08-17 8:58 ` Zubair Lutfullah : [not found] ` <520F9395.3050900@kernel.org> 2013-08-17 18:51 ` Zubair Lutfullah : 2013-08-16 12:53 ` Sebastian Andrzej Siewior 2013-08-16 12:53 ` Sebastian Andrzej Siewior 2013-08-16 21:18 ` Zubair Lutfullah : 2013-08-16 13:25 ` Sebastian Andrzej Siewior 2013-08-16 13:25 ` Sebastian Andrzej Siewior 2013-08-16 21:13 ` Zubair Lutfullah : 2013-08-16 14:59 ` Sebastian Andrzej Siewior 2013-08-16 14:59 ` Sebastian Andrzej Siewior 2013-08-16 21:10 ` Zubair Lutfullah : 2013-08-19 17:12 ` Sebastian Andrzej Siewior [this message] 2013-08-19 17:12 ` Sebastian Andrzej Siewior 2013-08-20 16:26 ` Zubair Lutfullah : 2013-08-20 16:26 ` Zubair Lutfullah : 2013-08-14 18:57 ` [PATCH 0/4] iio: input: ti_am335x_adc: Add continuous sampling support round 5 Jonathan Cameron 2013-08-14 18:05 ` Sebastian Andrzej Siewior 2013-08-16 21:23 ` Zubair Lutfullah : -- strict thread matches above, loose matches on Subject: below -- 2013-08-13 16:48 [PATCH 0/4] iio: input: ti_am335x_adc: Add continuous sampling support round 4 Zubair Lutfullah 2013-08-13 16:48 ` [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and trigger support Zubair Lutfullah 2013-08-13 17:05 ` Lee Jones 2013-08-13 17:05 ` Lee Jones
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