Re: [meta-rockchip][PATCH] kernel: linux-yocto: fix broken Ethernet MAC controller on RK3399 on 5.14 >= version <= 5.14.11


Quentin Schulz
 

Hi Khem,

On Tue, Nov 16, 2021 at 10:50:13AM -0800, Khem Raj wrote:
On Tue, Nov 16, 2021 at 10:03 AM Quentin Schulz <foss@...> wrote:



On November 16, 2021 6:45:05 PM GMT+01:00, Khem Raj <raj.khem@...> wrote:
On Tue, Nov 16, 2021 at 9:12 AM Quentin Schulz <
quentin.schulz@...> wrote:

On Tue, Nov 16, 2021 at 09:08:41AM -0800, Khem Raj wrote:
On Tue, Nov 16, 2021 at 9:04 AM Quentin Schulz
<quentin.schulz@...> wrote:

On Tue, Nov 16, 2021 at 09:00:42AM -0800, Khem Raj wrote:
On Tue, Nov 16, 2021 at 7:52 AM Quentin Schulz
<quentin.schulz@...> wrote:

From Linux kernel v5.14 to v5.14.11 (both included), the Ethernet
MAC
controller found on RK3399 is not working.

A fix is available in v5.14.12 and later (available also in v5.15)
which is provided here and applied to linux-yocto source tree if
linux-yocto version is of the impacted ones.

The conditional patching is unfortunately required because
Honister 3.4
has linux-yocto v5.14.9 and Honister 3.4.1 will have at least
linux-yocto v5.14.14.
Patching piece below looks quite a bit.
lets just fix v5.14.14 and dont worry about 3.4
v5.14.14 is already fixed. The only release currently is 3.4 and I hit
that issue, hence the patch.
I assume not everybody is updating to 3.4.1 when it's out, I've seen
people running behind dot releases.
What's bothering you?
once dot release is out then thats whats maintained not the original
release since they are incremental.
the anon python to apply a patch. Can you explain why we want to patch
applied this way ?
I could define a python function and use it like this:
SRC_URI:append:rk3399 = "${@rk3399_fix_mac(d)}"

Would that work better for you?

I am not yet convinced why should we have such version specific patch
If you could explain what's *really* bothering you, I could try to find a proper explanation or agree with you but it's a bit too vague to me right now. Anyway, I'll do some guesses in the next paragraphs.

Because Ethernet does not work for all RK3399-based boards in the latest and only release of Honister?
meta-rockchip does not have honister branch for now. So it expects
master to keep working with honister for now. kernel upgrades are
already committed into honister branch on meta-yocto-bsps so fix it
already available in latest honister
branch and will be in imminent point release soon as well.
meta-rockchip does not have a honister branch for now because it is
still working with master branch from OE-Core. This patch does not break
this behaviour.


meta-rockchip is the BSP layer for Rockchip based devices, if not there, where should I put this patch?

Or are we just going to say "Ethernet does not work, we know" to people asking instead of having this patch in? Obviously you could tell them to upgrade their oe-core/poky git repo to rolling honister or 3.4.1 once it's out but having this patch in avoid those questions.
I would say yes, document it as that of a known issue and possible fix
Do I add a "known issues" to the README then? Or where am I supposed to
add this piece of information were this patch not merged?

if someone is using exact point release. They might have snapshotted
meta-rockpi too and in that case it will be easy for them to carry a
local patch if needed.
vesion specific patching would also be setting a not so desired
patching practice, so I am trying to avoid it if we can.
I think we both understand each other's stance and I've no additional
arguments to give, so it'll be up to the maintainer(s) which is
officially Trevor, but maybe I am not aware of other unofficial
maintainers :)

In any case, I can have this patch in my own vendor BSP but since it
applies to all RK3399-based devices, I thought it'd be nicer to have it
in upstream meta-rockchip than in a vendor BSP unrelated to the boards
one's using.

@Trevor/maintainers, let us know what's your opinion on this so I know
if I should send a v2 using inline python function for SRC_URI instead
of using the anonymous python function.

Cheers,
Quentin

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