Subject: Build warning in drivers/dma/mmp_tdma.c

From: [email-masked] (Qiao Zhou)
Date: Wed, 4 Dec 2013 09:08:23 +0800

On 12/04/2013 05:02 AM, Dan Williams wrote:
> On Tue, Dec 3, 2013 at 2:43 AM, Qiao Zhou <[email-masked]> wrote:
>> On 12/03/2013 10:31 AM, Haojian Zhuang wrote:
>>>
>>> I prefer to add CONFIG_MMP_SRAM instead, since sram isn't available in
>>> pxa168.
>>
>> Hi Dan,
>>
>> I have two patches. Could you help check whether it can fix the issue?
>>
>> BTW, actually the 2nd alone is enough. The 1st patch is just in case that
>> you still want to use the old sram driver, and you need to enable MMP_SRAM.
>>
>> All, please help review the patches.
>>
>>  From 94601015d525db6d2baf47f4d517f38ae2e5e802 Mon Sep 17 00:00:00 2001
>> From: Qiao Zhou <[email-masked]>
>> Date: Tue, 3 Dec 2013 11:06:29 +0800
>> Subject: [PATCH 1/2] arm: mmp: build sram driver alone
>>
>> sram driver can be used by many chips besides CPU_MMP2, and so build
>> it alone.
>>
>> Signed-off-by: Qiao Zhou <[email-masked]>
>> ---
>>   arch/arm/mach-mmp/Makefile |    3 ++-
>>
>>   1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/arm/mach-mmp/Makefile b/arch/arm/mach-mmp/Makefile
>> index 9b702a1..98f0f63 100644
>> --- a/arch/arm/mach-mmp/Makefile
>> +++ b/arch/arm/mach-mmp/Makefile
>> @@ -7,7 +7,8 @@ obj-y                           += common.o devices.o time.o
>>   # SoC support
>>   obj-$(CONFIG_CPU_PXA168)       += pxa168.o
>>   obj-$(CONFIG_CPU_PXA910)       += pxa910.o
>>
>> -obj-$(CONFIG_CPU_MMP2)         += mmp2.o sram.o
>> +obj-$(CONFIG_CPU_MMP2)         += mmp2.o
>> +obj-$(CONFIG_MMP_SRAM)         += sram.o
>
> Missing the Kconfig change to add "config MMP_SRAM"?
The sram driver is unnecessary if we use generic pool. Zhangfei 
mentioned to remove this sram driver. It's just for your test.
>
>>
>>   ifeq ($(CONFIG_COMMON_CLK), )
>>   obj-y                          += clock.o
>> --
>> 1.7.0.4
>>
>>
>>  From 5396b1bffd574dbe778387979ecc24c51ee0c7a4 Mon Sep 17 00:00:00 2001
>> From: Qiao Zhou <[email-masked]>
>> Date: Tue, 3 Dec 2013 18:17:02 +0800
>> Subject: [PATCH 2/2] dma: mmp-tdma: use gen_pool to get asram
>>
>> use generic pool to get audio sram, instead of sram driver
>>
>> Signed-off-by: nhcao <[email-masked]>
>> Signed-off-by: Qiao Zhou <[email-masked]>
>> ---
>>   drivers/dma/Kconfig    |    1 +
>>   drivers/dma/mmp_tdma.c |   22 +++++++++++++++++-----
>>   2 files changed, 18 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>> index dd2874e..eeffe3c 100644
>> --- a/drivers/dma/Kconfig
>> +++ b/drivers/dma/Kconfig
>> @@ -288,6 +288,7 @@ config MMP_TDMA
>>
>>          bool "MMP Two-Channel DMA support"
>>          depends on ARCH_MMP
>>          select DMA_ENGINE
>> +       select GENERIC_ALLOCATOR
>
> You still need a depends on MMP_SRAM right?  Otherwise this just turns
> the compile error into a much more subtle runtime failure.
>
No dependence on MMP_SRAM(sram). You can refer to lib/genalloc.c

-- 

Best Regards
Qiao