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

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Date:   Tue, 3 Nov 2020 10:04:34 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     "tiantao (H)" <tiantao6@...wei.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        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

Hi

Am 03.11.20 um 09:57 schrieb tiantao (H):
> 
> 
> 在 2020/11/3 15:56, Thomas Zimmermann 写道:
>> Hi
>>
>> Thanks, the code looks good already. There just are a few nits below.
>>
> Thanks for the help with the review code.
> Add the new api devm_drm_irq_install and himbc use the new interface as
> one patch or two?

Better make two patches from it.

Best regards
Thomas

> 
>> Am 03.11.20 um 03:10 schrieb Tian Tao:
>>> 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
>>
>> The implementation should rather go to drm_irq.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,
>>> +             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
>>
>> And the declaration should go to drm_irq.h
>>
>> We generally don't merge unused code, so you should convert at least one
>> KMS driver, say hibmc, to use the new interface.
>>
>> Best regards
>> Thomas
>>
>>> @@ -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
>>>
>>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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