Re: (subset) [PATCH 0/4] arm64: amlogic: t7: describe the VIM4 supplies and keep the fabric clocks running

[Jerome Brunet]

On jeu. 03 sept. 2026 at 11:05, Lucas Tanure <tanure@xxxxxxxxx> wrote:

> On Mon, Aug 31, 2026 at 1:44 PM Neil Armstrong
> <neil.armstrong@xxxxxxxxxx> wrote:
>>
>> Hi,
>>
>> On Sat, 29 Aug 2026 10:47:54 +0100, Lucas Tanure wrote:
>> > The Khadas VIM4 has needed clk_ignore_unused to boot reliably. Without it
>> > the board hangs at random, loses storage and corrupts memory, and the
>> > failures move around from boot to boot.
>> >
>> > Six of the SoC's PWM outputs drive the board's voltage regulators: the
>> > always-on domain, both CPU clusters, the GPU, the NPU and the DRAM. None
>> > of them were described, so Linux saw the outputs as unused and switched
>> > them off about a second into boot. The regulators then drifted away from
>> > the levels the bootloader had set, which is where the corruption and the
>> > random hangs came from.
>> > Thanks to Chuan Liu from Amlogic for helping me indetify which clocks are
>> > critical.
>> >
>> > [...]
>>
>> Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v7.3/fixes)
>>
>> [2/4] arm64: dts: amlogic: t7: fix the pin groups of two PWM outputs
>>       https://git.kernel.org/amlogic/c/ae7be5c58a819259e5eb98a3abfa60842478f2ae
>> [3/4] arm64: dts: amlogic: t7: khadas-vim4: add the PWM-driven supplies
>>       https://git.kernel.org/amlogic/c/1e5a53bd16ac501e68463e84023d1bff543cc696
>> [4/4] arm64: dts: amlogic: t7: fix the pin groups of the vsync PWM
>>       https://git.kernel.org/amlogic/c/406292fd75f95aa3010fec95b5beb5a8b7e3ba3a
>>
>> These changes has been applied on the intermediate git tree [1].
>>
>> The v7.3/fixes branch will then be sent via a formal Pull Request to the Linux SoC maintainers
>> for inclusion in their intermediate git branches in order to be sent to Linus during
>> the next merge window, or sooner if it's a set of fixes.
>>
>> In the cases of fixes, those will be merged in the current release candidate
>> kernel and as soon they appear on the Linux master branch they will be
>> backported to the previous Stable and Long-Stable kernels [2].
>>
>> The intermediate git branches are merged daily in the linux-next tree [3],
>> people are encouraged testing these pre-release kernels and report issues on the
>> relevant mailing-lists.
>>
>> If problems are discovered on those changes, please submit a signed-off-by revert
>> patch followed by a corrective changeset.
>>
>> [1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
>> [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
>> [3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>>
>> --
>> Neil
>>
> Hi,
> Please don't take this. I will submit a better version.
> sys_ampipe_nand should not be critical.

Please submit a fixup change on top of what you've already sent, with
the proper 'Fixes:' tag.

>
> Thanks,
> Lucas

-- 
Jerome