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Subject: Re: Cine CT V6.1 code change request
To: Martin Herrman <martin.herrman@gmail.com>,
        linux-media@vger.kernel.org
References: <CADR1r6hbvri8qMYP2S7Pe9sxGsjh5iE2zWTUybYwcoRsbpgXFA@mail.gmail.com>
From: Hans Verkuil <hverkuil@xs4all.nl>
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Date: Wed, 15 Feb 2017 08:55:58 +0100
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On 02/14/2017 09:59 PM, Martin Herrman wrote:
> All,
> 
> I have a Cine CT V6.1 in my fedora 25 based media center. It is now
> running a default fedora 4.9 kernel. I install the driver as follows:
> 
> hg clone https://linuxtv.org/hg/~endriss/media_build_experimental

I'm not sure what this media_build directory is. It certainly is
outdated. The latest media_build is here: https://git.linuxtv.org/media_build.git/

> cd media_build_experimental
> make download
> make untar
> make menuconfig
> make
> make install
> 
> However, I have to make two changes to the source to make it work.
> 
> Change 1: in media_build_experimental/v4l/Kconfig line 6936 I have to
> remove the whitespace in '--- help ---', otherwise make menuconfig
> fails.

Can you show that line and the surrounding lines? I.e. the whole menu
entry?

> Change 2: during compilation the following error occurs (since about
> kernel 4.5?):

Most likely because the media build you use is outdated.

> 
> make -C /lib/modules/4.9.7-201.fc25.x86_64/build
> SUBDIRS=/home/htpc/Downloads/media_build_experimental/v4l  modules
> make[2]: Entering directory '/usr/src/kernels/4.9.7-201.fc25.x86_64'
>   CC [M]  /home/htpc/Downloads/media_build_experimental/v4l/tuner-xc2028.o
> In file included from <command-line>:0:0:
> /home/htpc/Downloads/media_build_experimental/v4l/compat.h:1463:1:
> error: redefinition of 'pci_zalloc_consistent'
>  pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
>  ^~~~~~~~~~~~~~~~~~~~~
> In file included from ./include/linux/pci.h:2145:0,
>                  from
> /home/htpc/Downloads/media_build_experimental/v4l/compat.h:1459,
>                  from <command-line>:0:
> ./include/linux/pci-dma-compat.h:23:1: note: previous definition of
> 'pci_zalloc_consistent' was here
>  pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
>  ^~~~~~~~~~~~~~~~~~~~~
> In file included from <command-line>:0:0:
> /home/htpc/Downloads/media_build_experimental/v4l/compat.h:1552:0:
> warning: "DMA_ATTR_SKIP_CPU_SYNC" redefined
>  #define DMA_ATTR_SKIP_CPU_SYNC 0
> 
> In file included from ./include/linux/pci-dma-compat.h:7:0,
>                  from ./include/linux/pci.h:2145,
>                  from
> /home/htpc/Downloads/media_build_experimental/v4l/compat.h:1459,
>                  from <command-line>:0:
> ./include/linux/dma-mapping.h:47:0: note: this is the location of the
> previous definition
>  #define DMA_ATTR_SKIP_CPU_SYNC  (1UL << 5)
> 
> scripts/Makefile.build:299: recipe for target
> '/home/htpc/Downloads/media_build_experimental/v4l/tuner-xc2028.o'
> failed
> make[3]: *** [/home/htpc/Downloads/media_build_experimental/v4l/tuner-xc2028.o]
> Error 1
> Makefile:1494: recipe for target
> '_module_/home/htpc/Downloads/media_build_experimental/v4l' failed
> make[2]: *** [_module_/home/htpc/Downloads/media_build_experimental/v4l] Error 2
> make[2]: Leaving directory '/usr/src/kernels/4.9.7-201.fc25.x86_64'
> Makefile:51: recipe for target 'default' failed
> make[1]: *** [default] Error 2
> make[1]: Leaving directory '/home/htpc/Downloads/media_build_experimental/v4l'
> Makefile:28: recipe for target 'all' failed
> make: *** [all] Error 2
> 
> Which I fix by commenting out lines 1462 up to 1468 in
> media_build_experimental/v4l/compat.h:
> 
> //static inline void *
> //pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
> // dma_addr_t *dma_handle)
> //{
> // return dma_alloc_coherent(hwdev == NULL ? NULL : &hwdev->dev,
> // size, dma_handle, GFP_ATOMIC | __GFP_ZERO);
> //}
> 
> Now it compiles and works fine. I still get these warnings:
> 
> media_build_experimental/v4l/compat.h:1552:0: warning:
> "DMA_ATTR_SKIP_CPU_SYNC" redefined
>  #define DMA_ATTR_SKIP_CPU_SYNC 0
> 
> Which I can easily remove by commenting out the specific line as well.
> 
> Now my questions are:
> - is this the correct way to fix these compile errors? (I'm definately
> not a professional developer)
> - what can I do to have this solved in the source?
> 
> Besides that, I'm also wondering if these drivers have any change of
> getting into kernel mainline?

Which driver?

Regards,

	Hans