On 06.01.19 10:53, Jan Kiszka wrote:

On 03.01.19 22:32, Ulf Hansson wrote:

quoted

On Wed, 2 Jan 2019 at 23:21, John Stultz [off-list ref] wrote:

quoted

Adding a few folks to cc from the thread here:
https://patchwork.kernel.org/patch/10734021/

As this sounds like a very similar issue.
thanks
-john

John, thanks for looping me in.

quoted

On Sun, Dec 30, 2018 at 3:38 AM Jan Kiszka [off-list ref] wrote:

quoted

From: Jan Kiszka <jan.kiszka@siemens.com>

Somewhere along recent changes to power control of the wl1835, power-on
became very unreliable on the hikey, failing like this:

wl1271_sdio: probe of mmc2:0001:1 failed with error -16
wl1271_sdio: probe of mmc2:0001:2 failed with error -16

After playing with some dt parameters and comparing to other users of
this chip, it turned out we need some power-on delay to make things
stable again. In contrast to those other users which define 200 ms, the
hikey is already very happy with 1 ms.

According to the discussions we had so far, this doesn't sound like
the correct solution.

I am intending to post patch soon, however, I am not sure exactly what
solution to pick yet. I will keep you on cc - and of course I
appreciate if you could help to test.

FWIW, the Ultra96 is also affected. Here I worked around it by using a 10 ms 
power-on delay. The original workaround from the other thread did not help. 
Looking forward to the proper fix now!

Any news on this regression?

Jan

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