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[media] cec-gpio: don't generate spurious HPD events

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Only send HPD_LOW/HIGH event if the gpio actually changed value.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2017-09-25 05:02:57 -03:00 committed by Mauro Carvalho Chehab
parent 6c3b047fa2
commit 5b2c8da1b0
1 changed files with 4 additions and 1 deletions
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5
drivers/media/platform/cec-gpio/cec-gpio.c
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@ -80,9 +80,12 @@ static irqreturn_t cec_hpd_gpio_irq_handler_thread(int irq, void *priv)
static irqreturn_t cec_hpd_gpio_irq_handler(int irq, void *priv)
{
struct cec_gpio *cec = priv;
bool is_high = gpiod_get_value(cec->hpd_gpio);
if (is_high == cec->hpd_is_high)
return IRQ_HANDLED;
cec->hpd_ts = ktime_get();
cec->hpd_is_high = gpiod_get_value(cec->hpd_gpio);
cec->hpd_is_high = is_high;
return IRQ_WAKE_THREAD;
}