Re: [PATCH v2 00/10] mfd: cros_ec: Add multi EC and proto v3 support

From: Alexandru Stan
Date: Mon May 11 2015 - 16:08:56 EST

On Mon, May 11, 2015 at 10:53 AM, Heiko Stuebner <heiko@xxxxxxxxx> wrote:
> Doing an evtest /dev/input/event0 does not result in key events, now after
> some keypresses I got a
> [ 48.352023] cros-ec-spi spi0.0: EC failed to respond in time
> [ 48.357695] cros-ec-spi spi0.0: Error transferring EC message -110
> [ 48.363884] cros-ec-spi spi0.0: failed to get keyboard state: -110
> [ 226.478588] cros-ec-spi spi0.0: Error transferring EC message -11
> [ 226.484690] cros-ec-spi spi0.0: failed to get keyboard state: -11 well as the touchpad) the keyboard
At first I tought it was because your EC firmware version is pretty old.
A while ago we fixed a pretty nasty scheduler bug that would have
caused similar symptoms:

I did my own testing with the trees you provided (v1 and v2) on
veyron-minnie and
I can definatelly confirm that v2 is broken.
Here's a snippet of what a key press generates on the EC log:
> [950.749097 KB poll]
[950.760357 HC 0x60]
[950.760555 HC err 6]
+[950.903657 HC 0x60]
[950.905243 HC err 6]
+[950.926239 KB wait]

Same key press on v1:
> [37.107390 KB poll]
[37.118457 HC 0x60]
[37.209218 HC 0x60]
[37.278431 KB wait]

In the EC code, error 6 is defined as EC_RES_INVALID_VERSION.

> in my very first try it started similarly non-working but after some time
> started magically working again, but now in subsequent tries I always get the
> spi error + working keyboard after a reboot.
At first the keyboard doesn't work for me either (20 or so seconds).
Then all keys show up and everything's fine (besides the errors on the EC log).

> Strangely this really seems to be limited to the keyboard, touchpad works
> flawlessly it seems.
Touchpad doesn't go through the EC, it's just a standard i2c device
directly connected to the AP.

Alexandru Stan (amstan)
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