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

Jaehoon Chung jh80.chung at samsung.com
Fri Apr 7 00:38:11 PDT 2017

On 04/07/2017 03:50 PM, Shawn Lin wrote:
> Hi Brian,
> On 2017/4/7 6:04, 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.
> Untile now, none of my(and my colleagues') rockchip platforms are able
> to reproduce this issue, so I can't tell what exactly the problem is.
> However, I noticed you mentioned that the Exynos platforms are also
> affected by rpm of dwmmc. I don't see dw_mmc-exynos enable this feature,
> so it looks quite odd to me!

Well, exynos boards what i have didn't see the similar issue.
But i will test all exynos boards for reproducing this.

> Can I or Eddie get a Veyron board to help you debug it?
>> Brian
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