Hello Czarek,
Thank you for your friendly feedback.
On Mi, Sep 28, 2022 at 04:24:43 +0200, Cezary Rojewski wrote:
On 2022-09-27 1:00 PM, Eugeniu Rosca wrote:
Hello Czarek,
...
I'd like to know more about the scenario you guys reproduced the problem in.
This patch was originally identified in the Intel Apollo Lake v4.1 KNLs. Given that the change itself is in the core sound subsystem, our internal assessment was that the patch might potentially be relevant/helpful on other HW platforms.
Our intention is to confirm or invalidate this assumption with the original developers of the patch, as well as with the audio maintainers and the members of the alsa-devel ML.
Configuration details and kernel base would be good to know too. Since our CI did not detect problem of such sort, if the problem actually exists, we would like to append a test or two to cover it later on.
If there is no evidence that the patch is fixing a real-life issue occurring in the latest vanilla, I agree to drop the patch.
So far, I do not possess this evidence myself.
I've spent some time to locate the change. Found it and it seems obsolete. Some tags are missing in the revision of yours and the original date does not match either - it's Apr 2018 for the original. Won't be mentioning the tags as some engineers no longer bear @intel.com.
soc-pcm and skylake-driver valuable bits from those trees are already part of the upstream. Most of what is left was later proven obsolete or redundant by my or Pierre's engineers. There seems to be no patch missing except for few fixes from the recent SKL/KBL up-revs for our clients. Nothing APL specific.
Thanks for this thorough check. That also gives us enough confidence to drop the patch in some of our downstream kernels.
Following kernels related to APL are maintained by the IPG team from software perspective: 4.1.42, 4.1.49, 4.4, 4.9, 4.14, 4.19
Multiple OSes. And then there are flavors for kernels/OS both. It's quite likely kernel base of yours fits into one of these buckets or at least have had changes ported from one of them.
Good to know and yes, you are right w.r.t. the origin of the patch.
TLDR: I agree here with my colleagues - if you believe the change is necessary, a proof e.g.: in form of reproduction steps, is needed. Otherwise it's no-go. Happy to hop on a call should you need any additional information.
That's a very kind attitude and we will definitely share any empirical evidence if it turns out the patch is really contributing with healing of any future runtime issues.
Regards, Czarek
Best Regards Eugeniu