Memory type used for ioremap

[Pedanekar, Hemant]

Shilimkar, Santosh wrote on Wednesday, August 11, 2010 6:34 PM:

>> -----Original Message-----
>> From: Pedanekar, Hemant
>> Sent: Wednesday, August 11, 2010 6:25 PM
>> To: Shilimkar, Santosh; Russell King - ARM Linux
>> Cc: linux-arm-kernel at lists.infradead.org
>> Subject: RE: Memory type used for ioremap
>> 
>> Shilimkar, Santosh wrote on Wednesday, August 04, 2010 5:35 PM:
>> 
>>>> -----Original Message-----
>>>> From: Pedanekar, Hemant
>>>> Sent: Wednesday, August 04, 2010 5:31 PM
>>>> To: Shilimkar, Santosh; Russell King - ARM Linux
>>>> Cc: linux-arm-kernel at lists.infradead.org
>>>> Subject: RE: Memory type used for ioremap
>>>> 
>>>> Shilimkar, Santosh wrote:
>>>>>> Pedanekar, Hemant wrote:
>>>>>>> Russell King - ARM Linux wrote:
>>>>>>>> On Fri, Jul 09, 2010 at 07:32:46PM +0530, Pedanekar,
>>>>> Hemant wrote:
>>>>>>>>> Catalin,
>>>>>>>> 
>>> 
>>>> Santosh,
>>>> 
>>>> Can you please point me to the patch series you mentioned? I will give
>>>> it a try.
>>> http://www.spinics.net/lists/arm-kernel/msg93218.html
>>> 
>> 
>> Thanks for the link. I applied the patches and used writel/readl but no
>> luck. The MT_DEVICE mappings still result into writes not getting through.
>> 
>>>> 
>>>> Regarding read-back, the writes themselves are not successful as the
>>>> peripheral has specific requirement for non-posted writes. So reading
>>>> back after write Always returns old value.
>>>> 
>>> Are you sure about this behaviour?
>> 
>> Yes. The writes are not going through with MT_DEVICE mappings as the target
>> peripheral has requirement for non-posted writes.
>> 
>> Looks like only strongly ordered mapping is resulting into non-posted
>> writes which works. Is there any specific reason the strongly order
>> mapping patch is not accepted/applied?
> 
> Attaching one which is I use for debugging. This is only for OMAP3/4 Hope
> this is useful to you. 
> 
> I suggest only the device which has non-posted requirement
> you convert it to SO
> 
> Regards,
> Santosh

Thanks again... yes the writes work fine with SO.

Is this patch accepted or under review? I don't see it on omap yet.

Thanks
-
Hemant