[PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[Adam Ford]

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@gmail.com>
---
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;
-- 
2.43.0

[PATCH V2 2/2] arm64: dts: imx8mp-beacon-kit: Enable HDMI bridge HPD

[Adam Ford]

The DSI to HDMI bridge supports hot-plut-detect, but the
driver didn't previously support a shared IRQ GPIO.  With
the driver updated, the interrupt can be added to the bridge.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
V2:  No Change

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
index a08057410bde..fba8fd04398d 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
@@ -304,6 +304,8 @@ adv_bridge: hdmi@3d {
 		compatible = "adi,adv7535";
 		reg = <0x3d>, <0x3c>, <0x3e>, <0x3f>;
 		reg-names = "main", "cec", "edid", "packet";
+		interrupt-parent = <&gpio4>;
+		interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
 		adi,dsi-lanes = <4>;
 		#sound-dai-cells = <0>;
 
-- 
2.43.0

Re: [PATCH V2 2/2] arm64: dts: imx8mp-beacon-kit: Enable HDMI bridge HPD

[Adam Ford]

On Mon, Mar 4, 2024 at 6:49 PM Adam Ford <aford173@gmail.com> wrote:
>
> The DSI to HDMI bridge supports hot-plut-detect, but the
> driver didn't previously support a shared IRQ GPIO.  With
> the driver updated, the interrupt can be added to the bridge.
>
> Signed-off-by: Adam Ford <aford173@gmail.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Shawn,

Patch 1/2 has been applied and sits in linux-next.  Are you OK to
apply this to the IMX branch so the hot-plug detection can work?

Thank you,

adam

adam
> ---
> V2:  No Change
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> index a08057410bde..fba8fd04398d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> @@ -304,6 +304,8 @@ adv_bridge: hdmi@3d {
>                 compatible = "adi,adv7535";
>                 reg = <0x3d>, <0x3c>, <0x3e>, <0x3f>;
>                 reg-names = "main", "cec", "edid", "packet";
> +               interrupt-parent = <&gpio4>;
> +               interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
>                 adi,dsi-lanes = <4>;
>                 #sound-dai-cells = <0>;
>
> --
> 2.43.0
>

Re: [PATCH V2 2/2] arm64: dts: imx8mp-beacon-kit: Enable HDMI bridge HPD

[Adam Ford]

On Tue, Apr 16, 2024 at 4:18 PM Adam Ford <aford173@gmail.com> wrote:
>
> On Mon, Mar 4, 2024 at 6:49 PM Adam Ford <aford173@gmail.com> wrote:
> >
> > The DSI to HDMI bridge supports hot-plut-detect, but the
> > driver didn't previously support a shared IRQ GPIO.  With
> > the driver updated, the interrupt can be added to the bridge.
> >
> > Signed-off-by: Adam Ford <aford173@gmail.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>
> Shawn,
>
> Patch 1/2 has been applied and sits in linux-next.  Are you OK to
> apply this to the IMX branch so the hot-plug detection can work?


Shawn,

Do you want me to repost this patch separately since patch 1/2 has
already been applied?

adam
>
> Thank you,
>
> adam
>
> adam
> > ---
> > V2:  No Change
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> > index a08057410bde..fba8fd04398d 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> > @@ -304,6 +304,8 @@ adv_bridge: hdmi@3d {
> >                 compatible = "adi,adv7535";
> >                 reg = <0x3d>, <0x3c>, <0x3e>, <0x3f>;
> >                 reg-names = "main", "cec", "edid", "packet";
> > +               interrupt-parent = <&gpio4>;
> > +               interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
> >                 adi,dsi-lanes = <4>;
> >                 #sound-dai-cells = <0>;
> >
> > --
> > 2.43.0
> >

Re: [PATCH V2 2/2] arm64: dts: imx8mp-beacon-kit: Enable HDMI bridge HPD

[Shawn Guo]

On Mon, Mar 04, 2024 at 06:48:58PM -0600, Adam Ford wrote:
> The DSI to HDMI bridge supports hot-plut-detect, but the
> driver didn't previously support a shared IRQ GPIO.  With
> the driver updated, the interrupt can be added to the bridge.
> 
> Signed-off-by: Adam Ford <aford173@gmail.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Applied, thanks!

Re: [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[Laurent Pinchart]

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@gmail.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

> ---
> 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

Re: [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[Adam Ford]

On Tue, Mar 5, 2024 at 2:18 AM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> 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@gmail.com>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>


Gentle nudge on this one.   It's been about a month, and without it,
it is preventing hot-plug detection on one board for me.

Thanks

adam

>
> > ---
> > 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

Re: [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[Dmitry Baryshkov]

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@gmail.com>
> ---
> V2:  Add check to see if there is IRQ data to handle
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Re: (subset) [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins

[Dmitry Baryshkov]

On Mon, 04 Mar 2024 18:48:57 -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.
> 
> [...]

Applied to drm-misc-next, thanks!

[1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins
      commit: f3d9683346d6b1d6e24f57e954385995601594d4

Best regards,
-- 
With best wishes
Dmitry