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

Shawn Lin shawn.lin at rock-chips.com
Thu Apr 6 23:50:04 PDT 2017

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!

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

> Brian

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