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SubjectRe: [PATCH] mfd: cros ec: spi: Fix "in progress" error signaling
Hi Alexandru

2018-03-26 19:26 GMT+02:00 Alexandru M Stan <>:
> Hello Enric
> On Mon, Mar 26, 2018 at 9:48 AM, Enric Balletbo Serra
> <> wrote:
>> Dear all,
>> Cc'ing some more chromium folks.
>> 2017-11-29 13:11 GMT+01:00 Lee Jones <>:
>>> On Wed, 27 Sep 2017, Shawn Nematbakhsh wrote:
>>>> For host commands that take a long time to process, cros ec can return
>>>> early by signaling a EC_RES_IN_PROGRESS result. The host must then poll
>>>> status with EC_CMD_GET_COMMS_STATUS until completion of the command.
>>>> None of the above applies when data link errors are encountered. When
>>>> errors such as EC_SPI_PAST_END are encountered during command
>>>> transmission, it usually means the command was not received by the EC.
>>>> Treating such errors as if they were 'EC_RES_IN_PROGRESS' results is
>>>> almost always the wrong decision, and can result in host commands
>>>> silently being lost.
>>>> Reported-and-tested-by: Jon Hunter <>
>>>> Signed-off-by: Shawn Nematbakhsh <>
>>>> ---
>>>> drivers/mfd/cros_ec_spi.c | 52 ++++++++++++++++++++++-------------------------
>>>> 1 file changed, 24 insertions(+), 28 deletions(-)
>>> Applied, thanks.
>> This patch is a bit old and is already applied but I would like to
>> discuss an issue that Tomeu found playing with kernelci and a Veyron
>> Jaq attached to our lab.
>> Seems that after this patch, the veyron jaq spits out lots of spi
>> tranfer error messages. See full log here [1]
>> cros-ec-spi spi0.0: spi transfer failed: -121
>> cros-ec-spi spi0.0: Command xfer error (err:-121)
>> cros-ec-i2c-tunnel ff110000.spi:ec@0:i2c-tunnel: Error transferring
>> EC i2c message -121
>> The issue is random, not always happens, but when happens makes
>> cros-ec unusable. Reproduce the issue is easier if CONFIG_SMP is not
>> set.
>> What happens is that the master starts the transmission and the
>> cros-ec returns an spi error event (EC_SPI_RX_BAD_DATA - data is
>> 0xfb). The difference between after and before the patch is that now
>> the cros-ec does not recover, whereas without this patch after some
>> tries it succeeds (note that before the patch the affected code
>> returned -EAGAIN whereas now returns -EREMOTEIO)
>> I think that reverting this patch is NOT the solution, but I don't
>> have enough knowledge yet to understand why the cros-ec fails. I need
>> to look at the cros-ec firmware to understand better what is
>> happening, but meanwhile, thoughts? clues?
>> An important note is that I did not reproduce the issue on a Veyron
>> Minnie, even with CONFIG_SMP disabled.
>> [1]
>> Best regards,
>> Enric
>>> --
>>> Lee Jones
>>> Linaro STMicroelectronics Landing Team Lead
>>> │ Open source software for ARM SoCs
>>> Follow Linaro: Facebook | Twitter | Blog
> Would it be possible for you to run "ectool version" on both your
> machines? Based on the code the EC is running we might have some hints
> on what the differences are.

I think that accessing to the ec console should give the same result, right?

In such case here is:

Veyron Minnie ( ASUS Chromebook Flip C100PA )
Chip: stm stm32f07x
Board: 0
RO: minnie_v1.1.2697-faafaa5
RW: minnie_v1.1.2712-242f6bd
Build: minnie_v1.1.2712-242f6bd 2016-11-03 00:34:41 @build196-m2

Veyron Jaq ( Haier Mighty MP )
Chip: stm stm32f07x
Board: 0
RO: mighty_v1.1.2680-6727e1d
RW: mighty_v1.1.2712-242f6bd
Build: mighty_v1.1.2680-6727e1d 2015-03-24 01:12:48 @build290-m2

We're running the RW firmware and I just discovered that our jaq is a
mighty (but I guess it's the same?)


> You can find both ectool and the code the ec runs on
> Though I would use ectool from the master branch.
> One thing I suspect is different is that veyron_minnie regularly polls
> an accelerometer, depending on the userspace you're running it's
> possible it unwedged itself with a few accelerometer requests.

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