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Subject: Re: [PATCH v2] drm/bridge: tpd12s015: Fix irq registering in
 tpd12s015_probe
To:     YueHaibing <yuehaibing@huawei.com>, <a.hajda@samsung.com>,
        <narmstrong@baylibre.com>, <Laurent.pinchart@ideasonboard.com>,
        <jonas@kwiboo.se>, <jernej.skrabec@siol.net>, <airlied@linux.ie>,
        <daniel@ffwll.ch>, <sebastian.reichel@collabora.com>,
        <sam@ravnborg.org>
CC:     <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>
References: <20201031031648.42368-1-yuehaibing@huawei.com>
 <20201102143024.26216-1-yuehaibing@huawei.com>
From:   Tomi Valkeinen <tomi.valkeinen@ti.com>
Message-ID: <8b1ac1a4-44ef-e0bd-cc4f-4045b10fe1d3@ti.com>
Date:   Tue, 3 Nov 2020 08:49:01 +0200
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On 02/11/2020 16:30, YueHaibing wrote:
> gpiod_to_irq() return negative value in case of error,
> the existing code doesn't handle negative error codes.
> If the HPD gpio supports IRQs (gpiod_to_irq returns a
> valid number), we use the IRQ. If it doesn't (gpiod_to_irq
> returns an error), it gets polled via detect(). 
> 
> Fixes: cff5e6f7e83f ("drm/bridge: Add driver for the TI TPD12S015 HDMI level shifter")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
> v2: Add checking for >= 0 and update commit message
> ---
>  drivers/gpu/drm/bridge/ti-tpd12s015.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-tpd12s015.c b/drivers/gpu/drm/bridge/ti-tpd12s015.c
> index 514cbf0eac75..e0e015243a60 100644
> --- a/drivers/gpu/drm/bridge/ti-tpd12s015.c
> +++ b/drivers/gpu/drm/bridge/ti-tpd12s015.c
> @@ -160,7 +160,7 @@ static int tpd12s015_probe(struct platform_device *pdev)
>  
>  	/* Register the IRQ if the HPD GPIO is IRQ-capable. */
>  	tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
> -	if (tpd->hpd_irq) {
> +	if (tpd->hpd_irq >= 0) {
>  		ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
>  						tpd12s015_hpd_isr,
>  						IRQF_TRIGGER_RISING |
> 

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

 Tomi

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