linux-kernel - Re: [PATCH v1 2/2] fbdev: Kconfig: Add HAS_IOMEM dependency for FB

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Date:   Fri, 26 Jan 2018 09:32:11 -0500
From:   Farhan Ali <alifm@...ux.vnet.ibm.com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>,
        Thomas Huth <thuth@...hat.com>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-fbdev@...r.kernel.org
Cc:     schwidefsky@...ibm.com, borntraeger@...ibm.com,
        stefan.kristiansson@...nalahti.fi
Subject: Re: [PATCH v1 2/2] fbdev: Kconfig: Add HAS_IOMEM dependency for
 FB_OPENCORES



On 01/26/2018 07:38 AM, Tomi Valkeinen wrote:
> On 26/01/18 14:33, Thomas Huth wrote:
>> On 25.01.2018 16:47, Farhan Ali wrote:
>>> The Opencores framebuffer device uses I/O memory and with
>>> CONFIG_HAS_IOMEM disabled will lead to build errors:
>>>
>>> ERROR: "devm_ioremap_resource" [drivers/video/fbdev/ocfb.ko] undefined!
>>>
>>> Fix this by adding HAS_IOMEM dependency for FB_OPENCORES.
>>>
>>> Signed-off-by: Farhan Ali <alifm@...ux.vnet.ibm.com>
>>> ---
>>>   drivers/video/fbdev/Kconfig | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
>>> index 5e58f5e..8667e5d 100644
>>> --- a/drivers/video/fbdev/Kconfig
>>> +++ b/drivers/video/fbdev/Kconfig
>>> @@ -976,7 +976,7 @@ config FB_PVR2
>>>   
>>>   config FB_OPENCORES
>>>   	tristate "OpenCores VGA/LCD core 2.0 framebuffer support"
>>> -	depends on FB && HAS_DMA
>>> +	depends on FB && HAS_DMA && HAS_IOMEM
>>>   	select FB_CFB_FILLRECT
>>>   	select FB_CFB_COPYAREA
>>>   	select FB_CFB_IMAGEBLIT
>>
>> I think it would be better if fbdevs in general would depend on
>> HAS_IOMEM ... or could there be any frame buffer devices without IOMEM ?
> 
> There are some small ones which are updated with, say, i2c
> (ssd1307fb.c). I think those don't need iomem.
> 
>   Tomi
> 

Most of the other framebuffer devices are fenced of by architecture 
dependency or PCI dependency. So I am hesitant to introduce a blanket 
dependency for all fbdevs.

Thank you guys for reviewing!

Thanks
Farhan