linux-kernel - Re: [PATCH v2] drm: Add the new api to install irq

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Message-ID: <20201103102334.GA401619@phenom.ffwll.local>
Date:   Tue, 3 Nov 2020 11:23:34 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm: Add the new api to install irq

On Tue, Nov 03, 2020 at 10:10:41AM +0800, Tian Tao wrote:
> Add new api devm_drm_irq_install() to register interrupts,
> no need to call drm_irq_uninstall() when the drm module is removed.
> 
> v2:
> fixed the wrong parameter.
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>  drivers/gpu/drm/drm_drv.c | 23 +++++++++++++++++++++++
>  include/drm/drm_drv.h     |  3 ++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index cd162d4..0fe5243 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -39,6 +39,7 @@
>  #include <drm/drm_color_mgmt.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_file.h>
> +#include <drm/drm_irq.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_mode_object.h>
>  #include <drm/drm_print.h>
> @@ -678,6 +679,28 @@ static int devm_drm_dev_init(struct device *parent,
>  	return ret;
>  }
>  
> +static void devm_drm_dev_irq_uninstall(void *data)
> +{
> +	drm_irq_uninstall(data);
> +}
> +
> +int devm_drm_irq_install(struct device *parent,

parent argument should not be needed, we have drm_device->dev. If that
doesn't work, then don't use the drm irq helpers, they're optional (and
there's already devm versions of the core irq functions).

Just a detail aside from all the other things alreay mentioned.
-Daniel

> +			 struct drm_device *dev, int irq)
> +{
> +	int ret;
> +
> +	ret = drm_irq_install(dev, irq);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action(parent, devm_drm_dev_irq_uninstall, dev);
> +	if (ret)
> +		devm_drm_dev_irq_uninstall(dev);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(devm_drm_irq_install);
> +
>  void *__devm_drm_dev_alloc(struct device *parent, struct drm_driver *driver,
>  			   size_t size, size_t offset)
>  {
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 0230762..fec1776 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -513,7 +513,8 @@ struct drm_driver {
>  
>  void *__devm_drm_dev_alloc(struct device *parent, struct drm_driver *driver,
>  			   size_t size, size_t offset);
> -
> +int devm_drm_irq_install(struct device *parent, struct drm_device *dev,
> +			 int irq);
>  /**
>   * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
>   * @parent: Parent device object
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch