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Date:	Thu, 17 Dec 2015 20:59:21 -0400
From:	Julian Margetson <runaway@...dw.ms>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find
 dma channel

On 12/17/2015 8:06 PM, Måns Rullgård wrote:
> Julian Margetson <runaway@...dw.ms> writes:
>
>> On 12/17/2015 3:53 PM, Måns Rullgård wrote:
>>> Julian Margetson <runaway@...dw.ms> writes:
>>>
>>>> On 12/17/2015 2:51 PM, Måns Rullgård wrote:
>>>>> Julian Margetson <runaway@...dw.ms> writes:
>>>>>
>>>>>> On 12/17/2015 1:59 PM, Måns Rullgård wrote:
>>>>>>> Julian Margetson <runaway@...dw.ms> writes:
>>>>>>>
>>>>>>>> I have been running my machine mostly configured for pciex1  thus with
>>>>>>>> the sata_dwc disabled.
>>>>>>>> The changes to sata_dwc-460ex do cause an oops.
>>>>>>>> I will try to give more detailed info over this weekend .
>>>>>>> The driver as is upstream would do that since it unconditionally
>>>>>>> dereferences a null pointer in the probe function.  My patch fixes that
>>>>>>> as a side-effect.
>>>>>>>
>>>>>> patching file drivers/ata/Kconfig
>>>>>>
>>>>>> Hunk #1 FAILED at 296.
>>>>> [...]
>>>>>
>>>>>> root@...ian-VirtualBox:/usr/src/linux-3.18.25#
>>>>> The patch is against 4.4-rc5.
>>>>>
>>>>    CC      drivers/ata/sata_dwc_460ex.o
>>>>
>>>> drivers/ata/sata_dwc_460ex.c:198:15: error: variable ‘sata_dwc_dma_dws’ has initializer but incomplete type
>>>>
>>>>    static struct dw_dma_slave sata_dwc_dma_dws = {
>>>>                  ^
>>> It builds, albeit with an unrelated warning, using the attached config.
>>> Maybe there's a missing config dependency somewhere.
>>>
>> I am attempting to cross compile under Ubuntu 14.04 X86 in Virtualbox
>> with your .config.
>> 4.4.0-rc5 builds ok with no patches applied .
>> Once your patch is applied it fails to build .
>>
>> CC      drivers/ata/sata_dwc_460ex.o
>> drivers/ata/sata_dwc_460ex.c:198:15: error: variable ‘sata_dwc_dma_dws’ has initializer but incomplete type
>>   static struct dw_dma_slave sata_dwc_dma_dws = {
>>                 ^
> Bizarre.  This is what it looks like here:
>
> mru@...corn:/tmp/linux-sata$ git status
> On branch sata-dwc
> nothing to commit, working directory clean
> mru@...corn:/tmp/linux-sata$ git describe
> v4.4-rc5
> mru@...corn:/tmp/linux-sata$ sha1sum /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch
> e300971aa483390f82de2e9120dc16e460e74feb  /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch
> mru@...corn:/tmp/linux-sata$ git am /tmp/0001-ata-sata_dwc_460ex-use-dmas-DT-property-to-find-dma-.patch
> Applying: ata: sata_dwc_460ex: use "dmas" DT property to find dma channel
> mru@...corn:/tmp/linux-sata$ sha1sum .config
> 4e7615b8d2fa9a1c4b4ae9ffc363aefcaf3789ca  .config
> mru@...corn:/tmp/linux-sata$ make ARCH=powerpc CROSS_COMPILE=powerpc64-none-linux-gnu- oldconfig
>    HOSTCC  scripts/basic/fixdep
>    HOSTCC  scripts/kconfig/conf.o
>    SHIPPED scripts/kconfig/zconf.tab.c
>    SHIPPED scripts/kconfig/zconf.lex.c
>    SHIPPED scripts/kconfig/zconf.hash.c
>    HOSTCC  scripts/kconfig/zconf.tab.o
>    HOSTLD  scripts/kconfig/conf
> scripts/kconfig/conf  --oldconfig Kconfig
> #
> # configuration written to .config
> #
> mru@...corn:/tmp/linux-sata$ make ARCH=powerpc CROSS_COMPILE=powerpc64-none-linux-gnu- drivers/ata/sata_dwc_460ex.o
> scripts/kconfig/conf  --silentoldconfig Kconfig
>    CHK     include/config/kernel.release
>    UPD     include/config/kernel.release
>    WRAP    arch/powerpc/include/generated/asm/clkdev.h
>    WRAP    arch/powerpc/include/generated/asm/div64.h
>    WRAP    arch/powerpc/include/generated/asm/irq_regs.h
>    WRAP    arch/powerpc/include/generated/asm/irq_work.h
>    WRAP    arch/powerpc/include/generated/asm/local64.h
>    WRAP    arch/powerpc/include/generated/asm/mcs_spinlock.h
>    WRAP    arch/powerpc/include/generated/asm/preempt.h
>    WRAP    arch/powerpc/include/generated/asm/rwsem.h
>    WRAP    arch/powerpc/include/generated/asm/vtime.h
>    CHK     include/generated/uapi/linux/version.h
>    UPD     include/generated/uapi/linux/version.h
>    CHK     include/generated/utsrelease.h
>    UPD     include/generated/utsrelease.h
>    CC      kernel/bounds.s
>    CHK     include/generated/bounds.h
>    UPD     include/generated/bounds.h
>    CHK     include/generated/timeconst.h
>    UPD     include/generated/timeconst.h
>    CC      arch/powerpc/kernel/asm-offsets.s
>    CHK     include/generated/asm-offsets.h
>    UPD     include/generated/asm-offsets.h
>    CALL    scripts/checksyscalls.sh
>    HOSTCC  scripts/dtc/dtc.o
>    HOSTCC  scripts/dtc/flattree.o
>    HOSTCC  scripts/dtc/fstree.o
>    HOSTCC  scripts/dtc/data.o
>    HOSTCC  scripts/dtc/livetree.o
>    HOSTCC  scripts/dtc/treesource.o
>    HOSTCC  scripts/dtc/srcpos.o
>    HOSTCC  scripts/dtc/checks.o
>    HOSTCC  scripts/dtc/util.o
>    SHIPPED scripts/dtc/dtc-lexer.lex.c
>    SHIPPED scripts/dtc/dtc-parser.tab.h
>    HOSTCC  scripts/dtc/dtc-lexer.lex.o
>    SHIPPED scripts/dtc/dtc-parser.tab.c
>    HOSTCC  scripts/dtc/dtc-parser.tab.o
>    HOSTLD  scripts/dtc/dtc
>    CC      scripts/mod/empty.o
>    HOSTCC  scripts/mod/mk_elfconfig
>    MKELF   scripts/mod/elfconfig.h
>    HOSTCC  scripts/mod/modpost.o
>    CC      scripts/mod/devicetable-offsets.s
>    GEN     scripts/mod/devicetable-offsets.h
>    HOSTCC  scripts/mod/file2alias.o
>    HOSTCC  scripts/mod/sumversion.o
>    HOSTLD  scripts/mod/modpost
>    HOSTCC  scripts/kallsyms
>    CC      drivers/ata/sata_dwc_460ex.o
> drivers/ata/sata_dwc_460ex.c: In function 'dma_dwc_xfer_setup':
> drivers/ata/sata_dwc_460ex.c:383:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>    dma_addr_t addr = (dma_addr_t)&hsdev->sata_dwc_regs->dmadr;
>                      ^
> mru@...corn:/tmp/linux-sata$
>
> Patch file and .config attached.
>
> Looking into that warning, I doubt it works as is, but that's not caused
> by my patch.  I can try to come up with a fix, but again, I can't test it.
>
I am using

make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu-

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