linux-kernel - Re: [PATCH v2 1/3] Kconfig : Remove HAS_IOMEM dependency for Graphics support

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Message-Id: <00fb2500-7656-f604-4253-3b7e73b9730a@linux.vnet.ibm.com>
Date:   Thu, 8 Feb 2018 10:28:56 -0500
From:   Farhan Ali <alifm@...ux.vnet.ibm.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-fbdev@...r.kernel.org, geert@...ux-m68k.org,
        stefan.kristiansson@...nalahti.fi, tomi.valkeinen@...com,
        schwidefsky@...ibm.com, dri-devel@...ts.freedesktop.org,
        Chen Liqin <liqin.linux@...il.com>,
        Lennox Wu <lennox.wu@...il.com>, Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2 1/3] Kconfig : Remove HAS_IOMEM dependency for Graphics
 support



On 02/08/2018 08:11 AM, Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> [ dri-devel ML & arch/[score,um] Maintainers added to Cc: ]
> 
> On Friday, February 02, 2018 08:59:57 AM Christian Borntraeger wrote:
>> On 02/01/2018 07:41 PM, Farhan Ali wrote:
>>> The 'commit e25df1205f37 ("[S390] Kconfig: menus with depends on HAS_IOMEM.")'
>>> added the HAS_IOMEM dependecy for "Graphics support". This disabled the
>>> "Graphics support" menu for S390. But if we enable VT layer for S390,
>>> we would also need to enable the dummy console. So let's remove the
>>> HAS_IOMEM dependency.
>>>
>>> Move this dependency to Opencores framebuffer driver which would fail to build
>>> with CONFIG_HAS_IOMEM disabled:
>>>
>>> ERROR: "devm_ioremap_resource" [drivers/video/fbdev/ocfb.ko] undefined!
> 
> "Graphics support" menu covers other things (i.e. DRM), I assume that
> they were also checked to not break due to this change?
> 
Yes, DRM compiled fine. And we (s390) would need the DRM subsystem for 
Virtio GPU as well.

> Moreover it seems that after this change "Graphics support" menu will
> be also enabled (besides s390) for score, tile and um architectures,
> I assume that this is okay?
> 
>>> Signed-off-by: Farhan Ali <alifm@...ux.vnet.ibm.com>
>>> Tested-by: Dong Jia Shi <bjsdjshi@...ux.vnet.ibm.com>
>>
>> This also enables several PCI based graphic device driver on s390.
>> This makes no sense but they all compile fine so I guess this is ok.
>>
>> I think patch 2 and 3 are clearly for the s390 tree, patch 1 seems trivial
>> Also ccing Bart. Can we maybe get an ack to carry this patch also via the s390
>> tree?
>>
>>
>>> ---
>>>   drivers/video/Kconfig       | 1 -
>>>   drivers/video/fbdev/Kconfig | 2 +-
>>>   2 files changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
>>> index 3c20af9..41e7ba9 100644
>>> --- a/drivers/video/Kconfig
>>> +++ b/drivers/video/Kconfig
>>> @@ -3,7 +3,6 @@
>>>   #
>>>
>>>   menu "Graphics support"
>>> -	depends on HAS_IOMEM
>>>
>>>   config HAVE_FB_ATMEL
>>>   	bool
>>> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
>>> index 2f615b7..ec9c9ce 100644
>>> --- a/drivers/video/fbdev/Kconfig
>>> +++ b/drivers/video/fbdev/Kconfig
>>> @@ -966,7 +966,7 @@ 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
> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>