linux-kernel - Re: [PATCH v3 1/2] drm/fb-cma-helper: Add function drm_fb_cma_create_with

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Date:	Thu, 12 May 2016 16:44:59 +0200
From:	Noralf Trønnes <noralf@...nnes.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	dri-devel@...ts.freedesktop.org, daniel@...ll.ch,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] drm/fb-cma-helper: Add function
 drm_fb_cma_create_with_funcs()


Den 12.05.2016 15:47, skrev Laurent Pinchart:
> Hi Noralf,
>
> Thank you for the patch.
>
> On Thursday 12 May 2016 14:53:25 Noralf Trønnes wrote:
>> Add drm_fb_cma_create_with_funcs() for drivers that need to set the
>> dirty() callback.
>>
>> Cc: laurent.pinchart@...asonboard.com
>> Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
>> ---
>>
>> Changes since v1:
>> - Expand docs
>>
>>   drivers/gpu/drm/drm_fb_cma_helper.c | 31 +++++++++++++++++++++++++------
>>   include/drm/drm_fb_cma_helper.h     |  3 +++
>>   2 files changed, 28 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
>> b/drivers/gpu/drm/drm_fb_cma_helper.c index 3165ac0..ede77c9 100644
>> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
>> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
>> @@ -159,13 +159,17 @@ static struct drm_fb_cma *drm_fb_cma_alloc(struct
>> drm_device *dev, }
>>
>>   /**
>> - * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create
>> callback function
>> + * drm_fb_cma_create_with_funcs() - helper function for the
>> + *                                  &drm_mode_config_funcs ->fb_create
>> + *                                  callback function
>>    *
>> - * If your hardware has special alignment or pitch requirements these
>> should be
>> - * checked before calling this function.
>> + * This can be used to set &drm_framebuffer_funcs for drivers that need the
>> + * dirty() callback. Use drm_fb_cma_create() if you don't need to change +
>> * &drm_framebuffer_funcs.
>>    */
>> -struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
>> -	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
>> +struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device
>> *dev,
>> +	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
>> +	struct drm_framebuffer_funcs *funcs)
> Shouldn't the funcs argument be const ?

Yes you're right, drm_framebuffer_init() uses const.
I missed this in my previous patch as well, so I need to fix up
drm_fb_cma_alloc() and drm_fbdev_cma_create_with_funcs() as well.

Thanks.

Noralf.

> Apart from that,
>
> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
>>   {
>>   	struct drm_fb_cma *fb_cma;
>>   	struct drm_gem_cma_object *objs[4];
>> @@ -202,7 +206,7 @@ struct drm_framebuffer *drm_fb_cma_create(struct
>> drm_device *dev, objs[i] = to_drm_gem_cma_obj(obj);
>>   	}
>>
>> -	fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, &drm_fb_cma_funcs);
>> +	fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
>>   	if (IS_ERR(fb_cma)) {
>>   		ret = PTR_ERR(fb_cma);
>>   		goto err_gem_object_unreference;
>> @@ -215,6 +219,21 @@ err_gem_object_unreference:
>>   		drm_gem_object_unreference_unlocked(&objs[i]->base);
>>   	return ERR_PTR(ret);
>>   }
>> +EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
>> +
>> +/**
>> + * drm_fb_cma_create() - &drm_mode_config_funcs ->fb_create callback
>> function
>> + *
>> + * If your hardware has special alignment or pitch requirements these
>> should be
>> + * checked before calling this function. Use drm_fb_cma_create_with_funcs()
>> if
>> + * you need to set &drm_framebuffer_funcs ->dirty.
>> + */
>> +struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
>> +	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
>> +{
>> +	return drm_fb_cma_create_with_funcs(dev, file_priv, mode_cmd,
>> +					    &drm_fb_cma_funcs);
>> +}
>>   EXPORT_SYMBOL_GPL(drm_fb_cma_create);
>>
>>   /**
>> diff --git a/include/drm/drm_fb_cma_helper.h
>> b/include/drm/drm_fb_cma_helper.h index c6d9c9c..1f9a8bc 100644
>> --- a/include/drm/drm_fb_cma_helper.h
>> +++ b/include/drm/drm_fb_cma_helper.h
>> @@ -31,6 +31,9 @@ void drm_fb_cma_destroy(struct drm_framebuffer *fb);
>>   int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
>>   	struct drm_file *file_priv, unsigned int *handle);
>>
>> +struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device
>> *dev,
>> +	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
>> +	struct drm_framebuffer_funcs *funcs);
>>   struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
>>   	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd);