linux-kernel - Re: [PATCH 4/4] DMA: XILINX_ZYNQMP_DPDMA depends on HAS

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Date:   Sun, 23 May 2021 12:08:18 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-kernel@...r.kernel.org, Stefan Roese <sr@...x.de>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        Sinan Kaya <okaya@...eaurora.org>,
        Green Wan <green.wan@...ive.com>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Tejas Upadhyay <tejasu@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 4/4] DMA: XILINX_ZYNQMP_DPDMA depends on HAS_IOMEM

On 5/23/21 11:53 AM, Laurent Pinchart wrote:
> Hi Randy,
> 
> On Sat, May 22, 2021 at 06:07:01PM -0700, Randy Dunlap wrote:
>> On 5/22/21 5:20 PM, Laurent Pinchart wrote:
>>> On Fri, May 21, 2021 at 07:13:13PM -0700, Randy Dunlap wrote:
>>>> When CONFIG_HAS_IOMEM is not set/enabled, most iomap() family
>>>> functions [including ioremap(), devm_ioremap(), etc.] are not
>>>> available.
>>>> Drivers that use these functions should depend on HAS_IOMEM so that
>>>> they do not cause build errors.
>>>>
>>>> Cures this build error:
>>>> s390-linux-ld: drivers/dma/xilinx/xilinx_dpdma.o: in function `xilinx_dpdma_probe':
>>>> xilinx_dpdma.c:(.text+0x336a): undefined reference to `devm_platform_ioremap_resource'
>>>
>>> I've previously posted
>>> https://lore.kernel.org/dmaengine/20210520152420.23986-2-laurent.pinchart@ideasonboard.com/T/#u
>>> which fixes the same issue (plus an additional one).
>>
>> Hi Laurent,
>>
>> I didn't add a dependency on OF because OF header files _mostly_
>> have stubs so that they work when  OF is enabled or disabled.
>>
>> I did find a problem in <linux/of_address.h> where it could end up
>> without having a stub. I will post a patch for that soon.
>> I'm currently doing lots of randconfig builds on it.
> 
> I'm fine with eithe approach, but the patch you've posted to address the
> of_address.h issue has an issue itself.

I'm also fine with either patch.
I'm reworking the of_address.h patch now.

Thanks.

> If Vinod would prefer merging this patch instead of mine,
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
>>>> Fixes: 7cbb0c63de3fc ("dmaengine: xilinx: dpdma: Add the Xilinx DisplayPort DMA engine driver")
>>>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>> Cc: Vinod Koul <vkoul@...nel.org>
>>>> CC: dmaengine@...r.kernel.org
>>>> Cc: Hyun Kwon <hyun.kwon@...inx.com>
>>>> Cc: Tejas Upadhyay <tejasu@...inx.com>
>>>> Cc: Michal Simek <michal.simek@...inx.com>
>>>> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>>>> ---
>>>>  drivers/dma/Kconfig |    1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> --- linux-next-20210521.orig/drivers/dma/Kconfig
>>>> +++ linux-next-20210521/drivers/dma/Kconfig
>>>> @@ -702,6 +702,7 @@ config XILINX_ZYNQMP_DMA
>>>>  
>>>>  config XILINX_ZYNQMP_DPDMA
>>>>  	tristate "Xilinx DPDMA Engine"
>>>> +	depends on HAS_IOMEM
>>>>  	select DMA_ENGINE
>>>>  	select DMA_VIRTUAL_CHANNELS
>>>>  	help
> 


-- 
~Randy