linux-kernel - Re: [PATCH v8 1/8] drm/etnaviv: add a dedicated function to register an irq handler

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Message-ID: <20230608172535.GA1207045@bhelgaas>
Date:   Thu, 8 Jun 2023 12:25:35 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Sui Jingfeng <15330273260@....cn>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Li Yi <liyi@...ngson.cn>,
        Sui Jingfeng <suijingfeng@...ngson.cn>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        etnaviv@...ts.freedesktop.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v8 1/8] drm/etnaviv: add a dedicated function to register
 an irq handler

On Wed, Jun 07, 2023 at 06:55:44PM +0800, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
> 
> Because getting IRQ from a device is platform-dependent, PCI devices have
> different methods for getting an IRQ. This patch is a preparation patch to
> extend the driver for the PCI device support.
> 
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Christian Gmeiner <christian.gmeiner@...il.com>
> Cc: Philipp Zabel <p.zabel@...gutronix.de>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 34 ++++++++++++++++++++-------
>  1 file changed, 25 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index de8c9894967c..b9c12d3145a2 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1817,6 +1817,29 @@ static const struct of_device_id etnaviv_gpu_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, etnaviv_gpu_match);
>  
> +static int etnaviv_gpu_register_irq(struct etnaviv_gpu *gpu, int irq)
> +{
> +	struct device *dev = gpu->dev;
> +	int err;
> +
> +	if (irq < 0) {
> +		dev_err(dev, "failed to get irq: %d\n", irq);

Isn't this message redundant because platform_get_irq() already
emitted a message for this case?

> +		return irq;
> +	}
> +
> +	err = devm_request_irq(dev, irq, irq_handler, 0, dev_name(dev), gpu);
> +	if (err) {
> +		dev_err(dev, "failed to request irq %u: %d\n", irq, err);
> +		return err;
> +	}
> +
> +	gpu->irq = irq;
> +
> +	dev_info(dev, "irq(%d) handler registered\n", irq);
> +
> +	return 0;
> +}
> +
>  static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -1837,16 +1860,9 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
>  		return PTR_ERR(gpu->mmio);
>  
>  	/* Get Interrupt: */
> -	gpu->irq = platform_get_irq(pdev, 0);
> -	if (gpu->irq < 0)
> -		return gpu->irq;
> -
> -	err = devm_request_irq(&pdev->dev, gpu->irq, irq_handler, 0,
> -			       dev_name(gpu->dev), gpu);
> -	if (err) {
> -		dev_err(dev, "failed to request IRQ%u: %d\n", gpu->irq, err);
> +	err = etnaviv_gpu_register_irq(gpu, platform_get_irq(pdev, 0));
> +	if (err)
>  		return err;
> -	}
>  
>  	/* Get Clocks: */
>  	gpu->clk_reg = devm_clk_get_optional(&pdev->dev, "reg");
> -- 
> 2.25.1
>