[REGRESSION 4.10] dw_mmc: failures on Rockchip rk3288 veyron boards

[Jaehoon Chung]

On 04/07/2017 07:04 AM, Brian Norris wrote:
> Hi,
> 
> On Thu, Mar 30, 2017 at 02:11:19PM +0900, Jaehoon Chung wrote:
>> On 03/30/2017 11:53 AM, Brian Norris wrote:
>>> On Thu, Mar 30, 2017 at 10:18:59AM +0800, Eddie Cai wrote:
>>>> I test on rk3288 firefly reload with 4.11-rc4. It work fine.
>>>
>>> OK, thanks for checking.
>>>
>>>>> On Thu, Mar 30, 2017 at 09:32:22AM +0800, Shawn Lin wrote:
>>>>>> Hi Brian,
>>>>>>
>>>>>> On 2017/3/30 9:17, Brian Norris wrote:
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I haven't managed to get as far as a bugfix for this, but I've bisected
>>>>>>> some issues seen on v4.10+ with a Chromebook of the Veyron family (Jaq,
>>>>>>> in particular). v4.9 works fine.
>>>
>>> [...]
>>>
>>> By the way, Kevin (CC'd) says he noticed similiar Wifi issues on an
>>> Exynos 5800 Peach chromebook, but not on an Exynos 5250 Snow chromebook.	
>>> I haven't picked these apart yet to see what the differences and
>>> similarities are, but presumably it's not actually a Rockchip-specific
>>> bug. Maybe related to the way power sequencing is plumbed for these, for
>>> example?
>>
>> I'm not sure but if card-detecting is polling, the timing issue could be occurred.
> 
> I don't know much about MMC in general, nor about this driver. Any
> chance you'd accept reverts of the patches in question though? This is a
> huge regression, and there were only a few relevant changes that seem to
> have triggered this. I can try to come up with something targeted, but
> I'm not going to even try if that'd get rejected up front.

Sure, if it's big regression, we can revert the patches relevant to problem.
After fixing it, we can re-apply them..before reverting, i will try to fix it until next Wends,

Otherwise, will revert them at that time.

Best Regards,
Jaehoon Chung

> 
> Brian
> 
> 
>