Hello Adam, Thank you for the patch. On Mon, Mar 04, 2024 at 06:48:57PM -0600, Adam Ford wrote: > The IRQ registration currently assumes that the GPIO is dedicated > to it, but that may not necessarily be the case. If the board has > another device sharing the GPIO, it won't be registered and the > hot-plug detect fails to function. > > Currently, the handler reads two registers and blindly > assumes one of them caused the interrupt and returns IRQ_HANDLED > unless there is an error. In order to properly do this, the IRQ > handler needs to check if it needs to handle the IRQ and return > IRQ_NONE if there is nothing to handle. With the check added > and the return code properly indicating whether or not it there > was an IRQ, the IRQF_SHARED can be set to share a GPIO IRQ. > > Signed-off-by: Adam Ford <aford173@xxxxxxxxx> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> > --- > V2: Add check to see if there is IRQ data to handle > > diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > index b5518ff97165..f3b4616a8fb6 100644 > --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > @@ -477,6 +477,11 @@ static int adv7511_irq_process(struct adv7511 *adv7511, bool process_hpd) > if (ret < 0) > return ret; > > + /* If there is no IRQ to handle, exit indicating no IRQ data */ > + if (!(irq0 & (ADV7511_INT0_HPD | ADV7511_INT0_EDID_READY)) && > + !(irq1 & ADV7511_INT1_DDC_ERROR)) > + return -ENODATA; > + > regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0); > regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1); > > @@ -1318,7 +1323,8 @@ static int adv7511_probe(struct i2c_client *i2c) > > ret = devm_request_threaded_irq(dev, i2c->irq, NULL, > adv7511_irq_handler, > - IRQF_ONESHOT, dev_name(dev), > + IRQF_ONESHOT | IRQF_SHARED, > + dev_name(dev), > adv7511); > if (ret) > goto err_unregister_audio; -- Regards, Laurent Pinchart
