[PATCH 01/10] fbdev: Add fb_ops init macros for framebuffers in DMA-able memory

[Thomas Zimmermann]

Hi Javier

Am 05.07.23 um 10:23 schrieb Javier Martinez Canillas:
> Thomas Zimmermann <tzimmermann at suse.de> writes:
> 
> Hello Thomas,
> 
>> Add initializer macros for struct fb_ops for framebuffers in DMA-able
>> memory areas. Also add a corresponding Kconfig token. As of now, this
>> is equivalent to system framebuffers and mostly useful for labeling
>> drivers correctly.
>>
>> A later patch may add a generic DMA-specific mmap operation. Linux
>> offers a number of dma_mmap_*() helpers for different use cases.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
>> Cc: Helge Deller <deller at gmx.de>
>> ---
>>   drivers/video/fbdev/Kconfig |  8 ++++++++
>>   include/linux/fb.h          | 13 +++++++++++++
>>   2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
>> index cecf15418632..f14229757311 100644
>> --- a/drivers/video/fbdev/Kconfig
>> +++ b/drivers/video/fbdev/Kconfig
>> @@ -168,6 +168,14 @@ config FB_DEFERRED_IO
>>   	bool
>>   	depends on FB
>>   
>> +config FB_DMA_HELPERS
>> +	bool
>> +	depends on FB
>> +	select FB_SYS_COPYAREA
>> +	select FB_SYS_FILLRECT
>> +	select FB_SYS_FOPS
>> +	select FB_SYS_IMAGEBLIT
>> +
>>   config FB_IO_HELPERS
>>   	bool
>>   	depends on FB
>> diff --git a/include/linux/fb.h b/include/linux/fb.h
>> index 1d5c13f34b09..1191a78c5289 100644
>> --- a/include/linux/fb.h
>> +++ b/include/linux/fb.h
>> @@ -594,6 +594,19 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
>>   	__FB_DEFAULT_SYS_OPS_DRAW, \
>>   	__FB_DEFAULT_SYS_OPS_MMAP
>>   
>> +/*
>> + * Helpers for framebuffers in DMA-able memory
>> + */
>> +
> 
> The comment for I/O memory helpers says:
> 
> /*
>   * Initializes struct fb_ops for framebuffers in I/O memory.
>   */
> 
> I think that would be good to have consistency between these two,

Sure, I had the same thought. I think I'll rather change the existing 
comments a bit.

Best regards
Thomas


> so something like:
> 
> /*
>   * Initializes struct fb_ops for framebuffers in DMA-able memory.
>   */
> 
>> +#define __FB_DEFAULT_DMA_OPS_RDWR \
>> +	.fb_read	= fb_sys_read, \
>> +	.fb_write	= fb_sys_write
>> +
>> +#define __FB_DEFAULT_DMA_OPS_DRAW \
>> +	.fb_fillrect	= sys_fillrect, \
>> +	.fb_copyarea	= sys_copyarea, \
>> +	.fb_imageblit	= sys_imageblit
>> +
> 
> Reviewed-by: Javier Martinez Canillas <javierm at redhat.com>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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