linux-kernel - Re: [PATCH v2 2/3] drm/panfrost: Add gpu_irq, mmu_irq to struct panfrost

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Message-ID: <20231128143127.5d52b75f@collabora.com>
Date:   Tue, 28 Nov 2023 14:31:27 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     robh@...nel.org, steven.price@....com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, m.szyprowski@...sung.com,
        krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH v2 2/3] drm/panfrost: Add gpu_irq, mmu_irq to struct
 panfrost_device

On Tue, 28 Nov 2023 13:45:09 +0100
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
wrote:

> In preparation for adding a IRQ synchronization mechanism for PM suspend
> add gpu_irq and mmu_irq variables to struct panfrost_device and change
> functions panfrost_gpu_init() and panfrost_mmu_init() to use those.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_device.h |  2 ++
>  drivers/gpu/drm/panfrost/panfrost_gpu.c    | 10 +++++-----
>  drivers/gpu/drm/panfrost/panfrost_mmu.c    | 10 +++++-----
>  3 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 0fc558db6bfd..54a8aad54259 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -94,6 +94,8 @@ struct panfrost_device {
>  	struct device *dev;
>  	struct drm_device *ddev;
>  	struct platform_device *pdev;
> +	int gpu_irq;
> +	int mmu_irq;
>  
>  	void __iomem *iomem;
>  	struct clk *clock;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> index bd41617c5e4b..7adc4441fa14 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> @@ -454,7 +454,7 @@ void panfrost_gpu_power_off(struct panfrost_device *pfdev)
>  
>  int panfrost_gpu_init(struct panfrost_device *pfdev)
>  {
> -	int err, irq;
> +	int err;
>  
>  	err = panfrost_gpu_soft_reset(pfdev);
>  	if (err)
> @@ -469,11 +469,11 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
>  
>  	dma_set_max_seg_size(pfdev->dev, UINT_MAX);
>  
> -	irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "gpu");
> -	if (irq < 0)
> -		return irq;
> +	pfdev->gpu_irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "gpu");
> +	if (pfdev->gpu_irq < 0)
> +		return pfdev->gpu_irq;
>  
> -	err = devm_request_irq(pfdev->dev, irq, panfrost_gpu_irq_handler,
> +	err = devm_request_irq(pfdev->dev, pfdev->gpu_irq, panfrost_gpu_irq_handler,
>  			       IRQF_SHARED, KBUILD_MODNAME "-gpu", pfdev);
>  	if (err) {
>  		dev_err(pfdev->dev, "failed to request gpu irq");
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index 846dd697c410..ac4296c1e54b 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -753,13 +753,13 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
>  
>  int panfrost_mmu_init(struct panfrost_device *pfdev)
>  {
> -	int err, irq;
> +	int err;
>  
> -	irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
> -	if (irq < 0)
> -		return irq;
> +	pfdev->mmu_irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
> +	if (pfdev->mmu_irq < 0)
> +		return pfdev->mmu_irq;
>  
> -	err = devm_request_threaded_irq(pfdev->dev, irq,
> +	err = devm_request_threaded_irq(pfdev->dev, pfdev->mmu_irq,
>  					panfrost_mmu_irq_handler,
>  					panfrost_mmu_irq_handler_thread,
>  					IRQF_SHARED, KBUILD_MODNAME "-mmu",