linux-kernel - Re: [PATCH-v4 00/11] i2c: pxa: Fixes, cleanup and support for pxa910 family

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Date:	Mon, 20 Jul 2015 22:30:55 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	robh+dt@...nel.org, yizhang@...vell.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH-v4 00/11] i2c: pxa: Fixes, cleanup and support for pxa910 family

Vaibhav Hiremath <vaibhav.hiremath@...aro.org> writes:

> On Monday 20 July 2015 12:39 PM, Vaibhav Hiremath wrote:
>>
>>
>> On Monday 20 July 2015 12:36 PM, Vaibhav Hiremath wrote:
>>>
>>>
>>> On Saturday 18 July 2015 01:19 AM, Robert Jarzmik wrote:
>>>> Vaibhav Hiremath <vaibhav.hiremath@...aro.org> writes:
>>>>
>>>>>> So, I applied patches 1-6 to for-next to make some progress.
>>>>>>
>>>>>> The others need more thought because of the bindings which shall be
>>>>>> discussed replying to the patches in question.
>>>>>>
>>>>>> Thanks for the updated work with lots of proper references.
>>>>>>
>>>>>
>>>>> OK, Thanks and no issues.
>>>>>
>>>>> Lets discuss more on the bindings.
>>>>
>>>> I made a simple try on my reference platform with the whole patchset.
>>>> It oopses on a NULL dereference.
>>>>
>>>> The stack is in [1].
>>>> I think it boils down to :
>>>>   - i2c_pxa_do_sclk_adj()
>>>>     - reg_ilcr = readl(_ILCR(i2c));
>>>>
>>>> I also think the faulty patch is :
>>>>   - i2c: pxa: Add ILCR (tLow & tHigh) configuration support
>>>>
>>>> My case, an I2C master case, I'd like you to find the issue and fix it.
>>>>
>>>
>>> Which is this reference platform?
>>> Can you share few details -
>>>
>>>   - reference Platform?
Mitac Mio A701, pxa270.

>>>   - DT file if you could
None, ran in platform_data mode.

>>>   - Boot log (if you could)
You already found the issue, no need for that anymore.

>>> I am using pxa1928 based platform, and I do not see any issues.

>> Having said that,
>> I see issues in the patch for non PXA910 platform, where
>> i2c_pxa_do_sclk_adj() will be called unconditionally and obviously
>> reg_ilcr and reg_wcr are not set.
Yep.

>> I will fix this and send the patch.
>
> This should fix the issue -
Most probably yes.

> If you are ok, I will re-spin the patch and submit.
Yes, I'm ok, let's try the next iteration.

Cheers.

-- 
Robert
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