linux-kernel - Re: [PATCH v3 07/24] iio: accel: kxcjk-1013: Revert "Add support for KX022-1020"

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Message-ID: <20241026182104.01086e41@jic23-huawei>
Date: Sat, 26 Oct 2024 18:21:04 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Rayyan Ansari <rayyan@...ari.sh>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Jonathan Cameron
 <Jonathan.Cameron@...wei.com>, Marius Cristea
 <marius.cristea@...rochip.com>, Trevor Gamblin <tgamblin@...libre.com>,
 Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>, Hans de Goede
 <hdegoede@...hat.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v3 07/24] iio: accel: kxcjk-1013: Revert "Add support
 for KX022-1020"

On Sat, 26 Oct 2024 15:58:52 +0100
Rayyan Ansari <rayyan@...ari.sh> wrote:

> On 26/10/2024 12:16, Jonathan Cameron wrote:
> > On Thu, 24 Oct 2024 22:04:56 +0300
> > Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> >   
> >> The mentioned change effectively broke the ODR startup timeouts
> >> settungs for KX023-1025 case. Let's revert it for now and see
> >> how we can handle it with the better approach after switching
> >> the driver to use data structure instead of enum.
> >>
> >> This reverts commit d5cbe1502043124ff8af8136b80f93758c4a61e0.
> >>
> >> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>  
> > I'll take this the slow way as I don't think there is time to chase the revert
> > through the various trees and still get the dependent patches in.
> > Hopefully we will fairly quickly get the missing table data and can
> > bring this back again.
> > 
> > For now, applied to the togreg branch of iio.git.
> > I have tagged it as a fix though. and +CC Rayyan
> > (I'm guessing maybe that will bounce as you rarely miss people you should
> > CC!)  
> Hi,
> Sorry for not replying earlier, I've just caught up with the discussion.
> 
> I don't fully understand why this is breaking KX023-1025, but you know 
> more than I do here.
> Does this not mean that the use of KX022-1020 in the 3 devices (Lumia 
> 640, 640 XL, 735) using this from qcom-msm8226-microsoft-common.dtsi 
> will now be broken?
> 
Yes.  The issues in the currently driver is here
https://elixir.bootlin.com/linux/v6.12-rc4/source/drivers/iio/accel/kxcjk-1013.c#L321

This array is indexed using the enum
https://elixir.bootlin.com/linux/v6.12-rc4/source/drivers/iio/accel/kxcjk-1013.c#L176
and the new entry for the KX022-1020 mean we are one short of those startup
time definitions.

Without that the values retrieved for the KX022-1025 are all 0.

It should be a relatively easy fix if we have those times.
One side effect of this series of Andy's is that it makes it much harder to have
similar bugs in future. 

Jonathan

> Thanks,
> Rayyan